make sure sketch can be exited (#6862)

* fix sketch on offset plane animations

* trigger CI

.env.development

@@ -9,10 +9,11 @@ VITE_KC_SITE_BASE_URL=https://dev.zoo.dev
 VITE_KC_SITE_APP_URL=https://app.dev.zoo.dev
 VITE_KC_SKIP_AUTH=false
 VITE_KC_CONNECTION_TIMEOUT_MS=5000
-#VITE_KC_DEV_TOKEN="optional token from dev.zoo.dev to skip auth in the app"
+#VITE_KC_DEV_TOKEN="optional token to skip auth in the app"
+#token="required token for playwright. TODO: clean up env vars in #3973"
 
 RUST_BACKTRACE=1
 PYO3_PYTHON=/usr/local/bin/python3
-#KITTYCAD_API_TOKEN="required token from dev.zoo.dev for engine testing"
+#KITTYCAD_API_TOKEN="required token for engine testing"
 
 FAIL_ON_CONSOLE_ERRORS=true

.github/ci-cd-scripts/upload-results.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+set -euo pipefail
+
+if [ -z "${TAB_API_URL:-}" ] || [ -z "${TAB_API_KEY:-}" ]; then
+    exit 0
+fi
+
+project="https://github.com/KittyCAD/modeling-app"
+branch="${GITHUB_HEAD_REF:-${GITHUB_REF_NAME:-}}"
+commit="${CI_COMMIT_SHA:-${GITHUB_SHA:-}}"
+
+echo "Uploading batch results"
+curl --silent --request POST \
+  --header "X-API-Key: ${TAB_API_KEY}" \
+  --form "project=${project}" \
+  --form "branch=${branch}" \
+  --form "commit=${commit}" \
+  --form "tests=@test-results/junit.xml" \
+  --form "CI_COMMIT_SHA=${CI_COMMIT_SHA:-}" \
+  --form "CI_PR_NUMBER=${CI_PR_NUMBER:-}" \
+  --form "GITHUB_BASE_REF=${GITHUB_BASE_REF:-}" \
+  --form "GITHUB_EVENT_NAME=${GITHUB_EVENT_NAME:-}" \
+  --form "GITHUB_HEAD_REF=${GITHUB_HEAD_REF:-}" \
+  --form "GITHUB_REF_NAME=${GITHUB_REF_NAME:-}" \
+  --form "GITHUB_REF=${GITHUB_REF:-}" \
+  --form "GITHUB_SHA=${GITHUB_SHA:-}" \
+  --form "GITHUB_WORKFLOW=${GITHUB_WORKFLOW:-}" \
+  --form "RUNNER_ARCH=${RUNNER_ARCH:-}" \
+  ${TAB_API_URL}/api/results/bulk
+
+echo
+echo "Sharing updated report"
+curl --silent --request POST \
+  --header "Content-Type: application/json" \
+  --header "X-API-Key: ${TAB_API_KEY}" \
+  --data "{
+    \"project\": \"${project}\",
+    \"branch\": \"${branch}\",
+    \"commit\": \"${commit}\"
+  }" \
+  ${TAB_API_URL}/api/share

.github/workflows/cargo-test.yml

@@ -98,9 +98,7 @@ jobs:
           popd
           git add \
             rust/kcl-lib/tests \
-            public/kcl-samples/manifest.json \
-            public/kcl-samples/README.md \
-            public/kcl-samples/screenshots
+            public/kcl-samples
           git config --local user.email "github-actions[bot]@users.noreply.github.com"
           git config --local user.name "github-actions[bot]"
           git remote set-url origin https://${{ github.actor }}:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}.git
@@ -177,13 +175,21 @@ jobs:
           cp nextest-archive.tar.zst rust/nextest-archive.tar.zst
           ls -lah
           cd rust
-          cargo nextest run\
-           --retries=10 --no-fail-fast --profile ci --archive-file nextest-archive.tar.zst \
+          cargo nextest run \
+           --retries=10 --no-fail-fast --profile=ci --archive-file nextest-archive.tar.zst \
            --partition count:${{ matrix.partitionIndex}}/${{ matrix.partitionTotal }} \
            2>&1 | tee /tmp/github-actions.log
         env:
           KITTYCAD_API_TOKEN: ${{secrets.KITTYCAD_API_TOKEN_DEV}}
           ZOO_HOST: https://api.dev.zoo.dev
+      - name: Upload results
+        if: always()
+        run: .github/ci-cd-scripts/upload-results.sh
+        env:
+          TAB_API_URL: ${{ secrets.TAB_API_URL }}
+          TAB_API_KEY: ${{ secrets.TAB_API_KEY }}
+          CI_COMMIT_SHA: ${{ github.event.pull_request.head.sha }}
+          CI_PR_NUMBER: ${{ github.event.pull_request.number }}
   run-wasm-tests:
     name: Run wasm tests
     strategy:

.github/workflows/e2e-tests.yml

@@ -229,7 +229,6 @@ jobs:
           max_attempts: 5
         env:
           token: ${{ secrets.KITTYCAD_API_TOKEN_DEV }}
-          snapshottoken: ${{ secrets.KITTYCAD_API_TOKEN }}
           TAB_API_URL: ${{ secrets.TAB_API_URL }}
           TAB_API_KEY: ${{ secrets.TAB_API_KEY }}
           CI_COMMIT_SHA: ${{ github.event.pull_request.head.sha }}

CONTRIBUTING.md

@@ -63,7 +63,7 @@ If you're not a Zoo employee you won't be able to access the dev environment, yo
 
 ### Development environment variables
 
-The Copilot LSP plugin in the editor requires a Zoo API token to run. In production, we authenticate this with a token via cookie in the browser and device auth token in the desktop environment, but this token is inaccessible in the dev browser version because the cookie is considered "cross-site" (from `localhost` to `dev.zoo.dev`). There is an optional environment variable called `VITE_KC_DEV_TOKEN` that you can populate with a dev token in a `.env.development.local` file to not check it into Git, which will use that token instead of other methods for the LSP service.
+The Copilot LSP plugin in the editor requires a Zoo API token to run. In production, we authenticate this with a token via cookie in the browser and device auth token in the desktop environment, but this token is inaccessible in the dev browser version because the cookie is considered "cross-site" (from `localhost` to `zoo.dev`). There is an optional environment variable called `VITE_KC_DEV_TOKEN` that you can populate with a dev token in a `.env.development.local` file to not check it into Git, which will use that token instead of other methods for the LSP service.
 
 ### Developing in Chrome
 
@@ -198,15 +198,9 @@ For more information on fuzzing you can check out
 
 ### Playwright tests
 
-You will need a `./e2e/playwright/playwright-secrets.env` file:
+Prepare these system dependencies:
 
-```bash
-$ touch ./e2e/playwright/playwright-secrets.env
-$ cat ./e2e/playwright/playwright-secrets.env
-token=<dev.zoo.dev/account/api-tokens>
-snapshottoken=<zoo.dev/account/api-tokens>
-```
-or use `export` to set the environment variables `token` and `snapshottoken`.
+- Set $token from https://zoo.dev/account/api-tokens
 
 #### Snapshot tests (Google Chrome on Ubuntu only)
 
@@ -302,7 +296,7 @@ Which will run our suite of [Vitest unit](https://vitest.dev/) and [React Testin
 
 Prepare these system dependencies:
 
-- Set `$KITTYCAD_API_TOKEN` from https://dev.zoo.dev/account/api-tokens
+- Set `$KITTYCAD_API_TOKEN` from https://zoo.dev/account/api-tokens
 - Install `just` following [these instructions](https://just.systems/man/en/packages.html)
 
 then run tests that target the KCL language:

Makefile

@@ -1,5 +1,5 @@
 .PHONY: all
-all: install build check
+all: install check build
 
 ###############################################################################
 # INSTALL

docs/kcl-lang/arithmetic.md

@@ -0,0 +1,53 @@
+---
+title: "Arithmetic and logic"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
+layout: manual
+---
+
+KCL supports the usual arithmetic operators on numbers and logic operators on booleans:
+
+| Operator | Meaning |
+|----------|---------|
+| `+` | Addition |
+| `-` | Subtraction or unary negation |
+| `*` | Multiplication |
+| `/` | Division |
+| `%` | Modulus aka remainder |
+| `^` | Power, e.g., `x ^ 2` means `x` squared |
+| `&` | Logical 'and' |
+| `|` | Logical 'or' |
+| `!` | Unary logical 'not' |
+
+KCL also supports comparsion operators which operate on numbers and produce booleans:
+
+| Operator | Meaning |
+|----------|---------|
+| `==` | Equal |
+| `!=` | Not equal |
+| `<` | Less than |
+| `>` | Greater than |
+| `<=` | Less than or equal |
+| `>=` | Greater than or equal |
+
+Arithmetics and logic expressions can be arbitrairly combined with the usual rules of associativity and precedence, e.g.,
+
+```
+myMathExpression = 3 + 1 * 2 / 3 - 7
+```
+
+You can also nest expressions in parenthesis:
+
+```
+myMathExpression = 3 + (1 * 2 / (3 - 7))
+```
+
+KCL numbers are implemented using [floating point numbers](https://en.wikipedia.org/wiki/Floating-point_arithmetic). This means that there are occasionally representation and rounding issues, and some oddities such as supporting positive and negative zero.
+
+Some operators can be applied to other types:
+
+- `+` can be used to concatenate strings, e.g., `'hello' + ' ' + 'world!'`
+- Unary `-` can be used with planes or line-like objects such as axes to produce an object with opposite orientation, e.g., `-XY` is a plain which is aligned with `XY` but whose normal aligns with the negative Z axis.
+- The following operators can be used with solids as shorthand for CSG operations:
+  - `+` or `|` for [`union`](/docs/kcl-std/union).
+  - `-` for [`subtract`](/docs/kcl-std/subtract).
+  - `&` for [`intersect`](/docs/kcl-std/intersect)

docs/kcl-lang/attributes.md

@@ -0,0 +1,30 @@
+---
+title: "Attributes"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
+layout: manual
+---
+
+Attributes are syntax which affects the language item they annotate. In KCL they are indicated using `@`. For example, `@settings` affects the file in which it appears.
+
+There are two kinds of attributes: named and unnamed attributes. Named attributes (e.g., `@settings`) have a name immediately after the `@` (e.g., `settings`) and affect their surrounding scope. Unnamed attributes have no name and affect the following item, e.g.,
+
+```kcl,norun
+@(lengthUnit = ft, coords = opengl)
+import "tests/inputs/cube.obj"
+```
+
+has an unnamed attribute on the `import` statement.
+
+Named and unnamed attributes may take a parenthesized list of arguments (like a function). Named attributes may also appear without any arguments (e.g., `@no_std`).
+
+## Named attributes
+
+The `@settings` attribute affects the current file and accepts the following arguments: `defaultLengthUnit`, `defaultAngleUnit`, and `kclVersion`. See [settings](/docs/kcl-lang/settings) for details.
+
+The `@no_std` attribute affects the current file, takes no arguments, and causes the standard library to not be implicitly available. It can still be used by being explicitly imported.
+
+## Unnamed attributes
+
+Unnamed attributes may be used on `import` statements when importing non-KCL files. See [projects, modules, and imports](/docs/kcl-lang/modules) for details.
+
+Other unnamed attributes are used on functions inside the standard library, but these are not available in user code.

docs/kcl-lang/foreign-imports.md

@@ -0,0 +1,99 @@
+---
+title: "Importing geometry from other CAD systems"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
+layout: manual
+---
+
+`import` can also be used to import files from other CAD systems. The format of the statement is the
+same as for KCL files. You can only import the whole file, not items from it. E.g.,
+
+```norun
+import "tests/inputs/cube.obj"
+
+// Use `cube` just like a KCL object.
+```
+
+```kcl
+import "tests/inputs/cube.sldprt" as cube
+
+// Use `cube` just like a KCL object.
+```
+
+For formats lacking unit data (such as STL, OBJ, or PLY files), the default
+unit of measurement is millimeters. Alternatively you may specify the unit
+by using an attribute. Likewise, you can also specify a coordinate system. E.g.,
+
+```kcl
+@(lengthUnit = ft, coords = opengl)
+import "tests/inputs/cube.obj"
+```
+
+When importing a GLTF file, the bin file will be imported as well.
+
+Import paths are relative to the current project directory. Imports currently only work when
+using the native Design Studio, not in the browser.
+
+### Supported values
+
+File formats: `fbx`, `gltf`/`glb`, `obj`+, `ply`+, `sldprt`, `step`/`stp`, `stl`+. (Those marked with a
+'+' support customising the length unit and coordinate system).
+
+Length units: `mm` (the default), `cm`, `m`, `inch`, `ft`, `yd`.
+
+Coordinate systems:
+
+- `zoo` (the default), forward: -Y, up: +Z, handedness: right
+- `opengl`, forward: +Z, up: +Y, handedness: right
+- `vulkan`, forward: +Z, up: -Y, handedness: left
+
+---
+
+## Performance deep‑dive for foreign‑file imports
+
+Parallelized foreign‑file imports now let you overlap file reads, initialization,
+and rendering. To maximize throughput, you need to understand the three distinct
+stages—reading, initializing (background render start), and invocation (blocking)
+—and structure your code to defer blocking operations until the end.
+
+### Foreign import execution stages
+
+1. **Import (Read / Initialization) Stage**
+   ```kcl
+   import "tests/inputs/cube.step" as cube
+   ```
+   - Reads the file from disk and makes its API available.
+   - Starts engine rendering but **does not block** your script.
+   - This kick‑starts the render pipeline while you keep executing other code.
+
+2. **Invocation (Blocking) Stage**
+   ```kcl
+   import "tests/inputs/cube.step" as cube
+
+   cube
+     |> translate(z=10) // ← blocks here only
+   ```
+   - Any method call (e.g., `translate`, `scale`, `rotate`) waits for the background render to finish before applying transformations.
+
+### Best practices
+
+#### 1. Defer blocking calls
+
+```kcl
+import "tests/inputs/cube.step" as cube     // 1) Read / Background render starts
+
+
+// --- perform other operations and calculations here ---
+
+
+cube
+  |> translate(z=10)                        // 2) Blocks only here
+```
+
+#### 2. Split heavy work into separate modules
+
+Place computationally expensive or IO‑heavy work into its own module so it can render in parallel while `main.kcl` continues.
+
+#### Future improvements
+
+Upcoming releases will auto‑analyse dependencies and only block when truly necessary. Until then, explicit deferral will give you the best performance.
+

docs/kcl-lang/functions.md

@@ -0,0 +1,46 @@
+---
+title: "Functions"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
+layout: manual
+---
+
+We have support for defining your own functions. Functions can take in any
+type of argument. Below is an example of the syntax:
+
+```
+fn myFn(x) {
+  return x
+}
+```
+
+As you can see above `myFn` just returns whatever it is given.
+
+KCL uses keyword arguments:
+
+```
+// If you declare a function like this
+fn add(left, right) {
+  return left + right
+}
+
+// You can call it like this:
+total = add(left = 1, right = 2)
+```
+
+Functions can also declare one *unlabeled* arg. If you do want to declare an unlabeled arg, it must
+be the first arg declared.
+
+```
+// The @ indicates an argument is used without a label.
+// Note that only the first argument can use @.
+fn increment(@x) {
+  return x + 1
+}
+
+fn add(@x, delta) {
+  return x + delta
+}
+
+two = increment(1)
+three = add(1, delta = 2)
+```

docs/kcl-lang/index.md

@@ -1,12 +1,21 @@
 ---
-title: "KCL Language Guide"
+title: "KCL Language Reference"
 excerpt: "Documentation of the KCL language for the Zoo Design Studio."
 layout: manual
 ---
 
+This is a reference for KCL. If you are learning KCL, you may prefer the [guide]() which explains
+things in a more tutorial fashion. See also our documentation of the [standard library](/docs/kcl-std).
+
 ## Topics
 
-* [`Types`](/docs/kcl-lang/types)
-* [`Modules`](/docs/kcl-lang/modules)
-* [`Settings`](/docs/kcl-lang/settings)
-* [`Known Issues`](/docs/kcl-lang/known-issues)
+* [Pipelines](/docs/kcl-lang/pipelines)
+* [Arithmetic and logic](/docs/kcl-lang/arithmetic)
+* [Values and types](/docs/kcl-lang/types)
+* [Numeric types and units](/docs/kcl-lang/numeric)
+* [Functions](/docs/kcl-lang/functions)
+* [Projects and modules](/docs/kcl-lang/modules)
+* [Attributes](/docs/kcl-lang/attributes)
+* [Importing geometry from other CAD systems](/docs/kcl-lang/foreign-imports)
+* [Settings](/docs/kcl-lang/settings)
+* [Known Issues](/docs/kcl-lang/known-issues)

docs/kcl-lang/known-issues.md

@@ -15,12 +15,6 @@ once fixed in engine will just start working here with no language changes.
 - **Import**: Right now you can import a file, even if that file has brep data
     you cannot edit it, after v1, the engine will account for this. 
 
-- **Fillets**: Fillets cannot intersect, you will get an error. Only simple fillet
-    cases work currently.
-
-- **Chamfers**: Chamfers cannot intersect, you will get an error. Only simple
-    chamfer cases work currently.
-
 - **Appearance**: Changing the appearance on a loft does not work. 
 
 - **CSG Booleans**: Coplanar (bodies that share a plane) unions, subtractions, and intersections are not currently supported.

docs/kcl-lang/modules.md

@@ -1,6 +1,6 @@
 ---
-title: "Modules"
-excerpt: "Documentation of modules for the KCL language for the Zoo Design Studio."
+title: "Projects and modules"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
 layout: manual
 ---
 
@@ -264,102 +264,3 @@ cube
 clone(cube)
   |> translate(x=20)
 ```
-
----
-
-## Importing files from other CAD systems
-
-`import` can also be used to import files from other CAD systems. The format of the statement is the
-same as for KCL files. You can only import the whole file, not items from it. E.g.,
-
-```norun
-import "tests/inputs/cube.obj"
-
-// Use `cube` just like a KCL object.
-```
-
-```kcl
-import "tests/inputs/cube.sldprt" as cube
-
-// Use `cube` just like a KCL object.
-```
-
-For formats lacking unit data (such as STL, OBJ, or PLY files), the default
-unit of measurement is millimeters. Alternatively you may specify the unit
-by using an attribute. Likewise, you can also specify a coordinate system. E.g.,
-
-```kcl
-@(lengthUnit = ft, coords = opengl)
-import "tests/inputs/cube.obj"
-```
-
-When importing a GLTF file, the bin file will be imported as well.
-
-Import paths are relative to the current project directory. Imports currently only work when
-using the native Design Studio, not in the browser.
-
-### Supported values
-
-File formats: `fbx`, `gltf`/`glb`, `obj`+, `ply`+, `sldprt`, `step`/`stp`, `stl`+. (Those marked with a
-'+' support customising the length unit and coordinate system).
-
-Length units: `mm` (the default), `cm`, `m`, `inch`, `ft`, `yd`.
-
-Coordinate systems:
-
-- `zoo` (the default), forward: -Y, up: +Z, handedness: right
-- `opengl`, forward: +Z, up: +Y, handedness: right
-- `vulkan`, forward: +Z, up: -Y, handedness: left
-
----
-
-## Performance deep‑dive for foreign‑file imports
-
-Parallelized foreign‑file imports now let you overlap file reads, initialization,
-and rendering. To maximize throughput, you need to understand the three distinct
-stages—reading, initializing (background render start), and invocation (blocking)
-—and structure your code to defer blocking operations until the end.
-
-### Foreign import execution stages
-
-1. **Import (Read / Initialization) Stage**
-   ```kcl
-   import "tests/inputs/cube.step" as cube
-   ```
-   - Reads the file from disk and makes its API available.
-   - Starts engine rendering but **does not block** your script.
-   - This kick‑starts the render pipeline while you keep executing other code.
-
-2. **Invocation (Blocking) Stage**
-   ```kcl
-   import "tests/inputs/cube.step" as cube
-
-   cube
-     |> translate(z=10) // ← blocks here only
-   ```
-   - Any method call (e.g., `translate`, `scale`, `rotate`) waits for the background render to finish before applying transformations.
-
-### Best practices
-
-#### 1. Defer blocking calls
-
-```kcl
-import "tests/inputs/cube.step" as cube     // 1) Read / Background render starts
-
-
-// --- perform other operations and calculations here ---
-
-
-cube
-  |> translate(z=10)                        // 2) Blocks only here
-```
-
-#### 2. Split heavy work into separate modules
-
-Place computationally expensive or IO‑heavy work into its own module so it can render in parallel while `main.kcl` continues.
-
-#### Future improvements
-
-Upcoming releases will auto‑analyse dependencies and only block when truly necessary. Until then, explicit deferral will give you the best performance.
-
-

docs/kcl-lang/numeric.md

@@ -0,0 +1,48 @@
+---
+title: "Numeric types and units"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
+layout: manual
+---
+
+Numbers and numeric types in KCL include information about the units of the numbers. So rather than just having a number like `42`, we always have information about the units so we don't confuse 42 mm with 42 inches.
+
+
+## Numeric literals
+
+When writing a number literal, you can use a unit suffix to explicitly state the unit, e.g., `42mm`. The following units are available:
+
+- Length units:
+  - metric: `mm`, `cm`, `m`
+  - imperial: `in`, `ft`, `yd`
+- Angle units: `deg`, `rad`
+- `_` to indicate a unitless number such as a count or ratio.
+
+If you write a numeric literal without a suffix, then the defaults for the current file are used. These defaults are specified using the `@settings` attribute, see [settings](/docs/kcl-lang/settings) for details. Note that if using the defaults, the KCL interpreter won't know whether you intend the number to be a length, angle, or count and will treat it as being possibly any of them.
+
+
+## Numeric types
+
+Just like numbers carry units information, the `number` type also includes units information. Units are written in parentheses after the type, e.g., `number(mm)`.
+
+Any of the suffixes described above can be used meaning that values with that type have the supplied units. E.g., `number(mm)` is the type of number values with mm units and `number(_)` is the type of number values with no units.
+
+You can also use `number(Length)`, `number(Angle)`, or `number(Count)`. These types mean a number with any length, angle, or unitless (count) units, respectively (note that `number(_)` and `number(Count)` are equivalent since there is only one kind of unitless-ness).
+
+Using just `number` means accepting any kind of number, even where the units are unknown by KCL.
+
+
+## Function calls
+
+When calling a function with an argument with numeric type, the declared numeric type in the function signature and the units of the argument value used in the function call must be compatible. Units are adjusted automatically. For example, if a function requires an argument with type `number(mm)`, then you can call it with `2in` and the units will be automatically adjusted, but calling it with `90deg` will cause an error.
+
+
+## Mixing units with arithmetic
+
+When doing arithmetic or comparisons, units will be adjusted as necessary if possible. However, often arithmetic expressions exceed the ability of KCL to accurately choose units which can result in warnings in your code or sometimes errors. In these cases, you will need to give KCL more information. Sometimes this can be done by making units explicit using suffixes. If not, then you will need to use *type ascription*, which asserts that an expression has the supplied type. For example, `(x * y): number(mm)` tells KCL that the units of `x * y` is mm. Note that type ascription does not do any adjustment of the numbers, e.g., `2mm: number(in)` has the value `2in` (note that this would be a very non-idiomatic way to use numeric type ascription, you could simply write `2in`. Usually type ascription is only necessary for supplying type information about the result of computation).
+
+KCL has no support for area, volume, or other higher dimension units. When internal unit tracking requires multiple dimensions, KCL essentially gives up. This is usually where the extra type information described above is needed. If doing computation with higher dimensioned units, you must ensure that all adjustments occur before any computation. E.g., if you want to compute an area with unknown units, you must convert all numbers to the same unit before starting.
+
+
+## Explicit conversions
+
+You might sometimes need to convert from one unit to another for some calculation. You can do this implicitly when calling a function (see above), but if you can't or don't want to, then you can use the explicit conversion functions in the [`std::units`](/docs/kcl-std/modules/std-units) module.

docs/kcl-lang/pipelines.md

@@ -0,0 +1,66 @@
+---
+title: "Pipelines"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
+layout: manual
+---
+
+It can be hard to read repeated function calls, because of all the nested brackets.
+
+```norun
+i = 1
+x = h(g(f(i)))
+```
+
+You can make this easier to read by breaking it into many declarations, but that is a bit annoying.
+
+```norun
+i  = 1
+x0 = f(i)
+x1 = g(x0)
+x  = h(x1)
+```
+
+Instead, you can use the pipeline operator (`|>`) to simplify this.
+
+Basically, `x |> f(%)` is a shorthand for `f(x)`. The left-hand side of the `|>` gets put into
+the `%` in the right-hand side.
+
+So, this means `x |> f(%) |> g(%)` is shorthand for `g(f(x))`. The code example above, with its
+somewhat-clunky `x0` and `x1` constants could be rewritten as
+
+```norun
+i = 1
+x = i
+  |> f(%)
+  |> g(%)
+  |> h(%)
+```
+
+This helps keep your code neat and avoid unnecessary declarations.
+
+## Pipelines and keyword arguments
+
+Say you have a long pipeline of sketch functions, like this:
+
+```norun
+startSketchOn(XZ)
+  |> line(%, end = [3, 4])
+  |> line(%, end = [10, 10])
+  |> line(%, end = [-13, -14])
+  |> close(%)
+```
+
+In this example, each function call outputs a sketch, and it gets put into the next function call via
+the `%`, into the first (unlabeled) argument.
+
+If a function call uses an unlabeled first parameter, it will default to `%` if it's not given. This
+means that `|> line(%, end = [3, 4])` and `|> line(end = [3, 4])` are equivalent! So the above
+could be rewritten as 
+
+```norun
+startSketchOn(XZ)
+ |> line(end = [3, 4])
+ |> line(end = [10, 10])
+ |> line(end = [-13, -14])
+ |> close()
+```

docs/kcl-lang/settings.md

@@ -1,6 +1,6 @@
 ---
 title: "Settings"
-excerpt: "Documentation of settings for the KCL language and Zoo Design Studio."
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
 layout: manual
 ---
 

docs/kcl-lang/types.md

@@ -1,6 +1,6 @@
 ---
-title: "Types"
-excerpt: "Documentation of types for the KCL standard library for the Zoo Design Studio."
+title: "Values and types"
+excerpt: "Documentation of the KCL language for the Zoo Design Studio."
 layout: manual
 ---
 
@@ -52,131 +52,6 @@ their internal components. See the [modules and imports docs](modules) for more
 detail on importing geometry.
 
 
-## Binary expressions
-
-You can also do math! Let's show an example below:
-
-```
-myMathExpression = 3 + 1 * 2 / 3 - 7
-```
-
-You can nest expressions in parenthesis as well:
-
-```
-myMathExpression = 3 + (1 * 2 / (3 - 7))
-```
-
-## Functions
-
-We also have support for defining your own functions. Functions can take in any
-type of argument. Below is an example of the syntax:
-
-```
-fn myFn(x) {
-  return x
-}
-```
-
-As you can see above `myFn` just returns whatever it is given.
-
-KCL's early drafts used positional arguments, but we now use keyword arguments:
-
-```
-// If you declare a function like this
-fn add(left, right) {
-  return left + right
-}
-
-// You can call it like this:
-total = add(left = 1, right = 2)
-```
-
-Functions can also declare one *unlabeled* arg. If you do want to declare an unlabeled arg, it must
-be the first arg declared.
-
-```
-// The @ indicates an argument can be used without a label.
-// Note that only the first argument can use @.
-fn increment(@x) {
-  return x + 1
-}
-
-fn add(@x, delta) {
-  return x + delta
-}
-
-two = increment(1)
-three = add(1, delta = 2)
-```
-
-## Pipelines
-
-It can be hard to read repeated function calls, because of all the nested brackets.
-
-```norun
-i = 1
-x = h(g(f(i)))
-```
-
-You can make this easier to read by breaking it into many declarations, but that is a bit annoying.
-
-```norun
-i  = 1
-x0 = f(i)
-x1 = g(x0)
-x  = h(x1)
-```
-
-Instead, you can use the pipeline operator (`|>`) to simplify this.
-
-Basically, `x |> f(%)` is a shorthand for `f(x)`. The left-hand side of the `|>` gets put into
-the `%` in the right-hand side.
-
-So, this means `x |> f(%) |> g(%)` is shorthand for `g(f(x))`. The code example above, with its
-somewhat-clunky `x0` and `x1` constants could be rewritten as
-
-```norun
-i = 1
-x = i
-  |> f(%)
-  |> g(%)
-  |> h(%)
-```
-
-This helps keep your code neat and avoid unnecessary declarations.
-
-## Pipelines and keyword arguments
-
-Say you have a long pipeline of sketch functions, like this:
-
-```norun
-startSketchOn(XZ)
-  |> line(%, end = [3, 4])
-  |> line(%, end = [10, 10])
-  |> line(%, end = [-13, -14])
-  |> close(%)
-```
-
-In this example, each function call outputs a sketch, and it gets put into the next function call via
-the `%`, into the first (unlabeled) argument.
-
-If a function call uses an unlabeled first parameter, it will default to `%` if it's not given. This
-means that `|> line(%, end = [3, 4])` and `|> line(end = [3, 4])` are equivalent! So the above
-could be rewritten as 
-
-```norun
-startSketchOn(XZ)
- |> line(end = [3, 4])
- |> line(end = [10, 10])
- |> line(end = [-13, -14])
- |> close()
-```
-
-Note that we are still in the process of migrating KCL's standard library to use keyword arguments. So some
-functions are still unfortunately using positional arguments. We're moving them over, so keep checking back.
-Some functions are still using the old positional argument syntax.
-Check the docs page for each function and look at its examples to see.
-
 ## Tags
 
 Tags are used to give a name (tag) to a specific path.
@@ -291,7 +166,6 @@ See how we use the tag `rectangleSegmentA001` in the `fillet` function outside
 the `rect` function. This is because the `rect` function is returning the
 sketch group that contains the tags.
 
-
 ---
 
 If you find any issues using any of the above expressions or syntax,

docs/kcl-std/consts/std-X.md

@@ -1,11 +1,11 @@
 ---
 title: "X"
 subtitle: "Constant in std"
-excerpt: ""
+excerpt: "The X-axis (can be used in both 2d and 3d contexts)."
 layout: manual
 ---
 
-
+The X-axis (can be used in both 2d and 3d contexts).
 
 ```kcl
 X

docs/kcl-std/consts/std-XY.md

@@ -1,11 +1,11 @@
 ---
 title: "XY"
 subtitle: "Constant in std"
-excerpt: ""
+excerpt: "An abstract 3d plane aligned with the X and Y axes. Its normal is the positive Z axis."
 layout: manual
 ---
 
-
+An abstract 3d plane aligned with the X and Y axes. Its normal is the positive Z axis.
 
 ```kcl
 XY

docs/kcl-std/consts/std-XZ.md

@@ -1,11 +1,11 @@
 ---
 title: "XZ"
 subtitle: "Constant in std"
-excerpt: ""
+excerpt: "An abstract 3d plane aligned with the X and Z axes. Its normal is the negative Y axis."
 layout: manual
 ---
 
-
+An abstract 3d plane aligned with the X and Z axes. Its normal is the negative Y axis.
 
 ```kcl
 XZ

docs/kcl-std/consts/std-Y.md

@@ -1,11 +1,11 @@
 ---
 title: "Y"
 subtitle: "Constant in std"
-excerpt: ""
+excerpt: "The Y-axis (can be used in both 2d and 3d contexts)."
 layout: manual
 ---
 
-
+The Y-axis (can be used in both 2d and 3d contexts).
 
 ```kcl
 Y

docs/kcl-std/consts/std-YZ.md

@@ -1,11 +1,11 @@
 ---
 title: "YZ"
 subtitle: "Constant in std"
-excerpt: ""
+excerpt: "An abstract 3d plane aligned with the Y and Z axes. Its normal is the positive X axis."
 layout: manual
 ---
 
-
+An abstract 3d plane aligned with the Y and Z axes. Its normal is the positive X axis.
 
 ```kcl
 YZ

docs/kcl-std/consts/std-Z.md

@@ -1,11 +1,11 @@
 ---
 title: "Z"
 subtitle: "Constant in std"
-excerpt: ""
+excerpt: "The 3D Z-axis."
 layout: manual
 ---
 
-
+The 3D Z-axis.
 
 ```kcl
 Z

docs/kcl-std/consts/std-math-PI.md

@@ -11,7 +11,13 @@ The value of `pi`, Archimedes’ constant (π).
 PI: number(_?) = 3.14159265358979323846264338327950288_?
 ```
 
-
+`PI` is a number and is technically a ratio, so you might expect it to have type `number(_)`.
+However, `PI` is nearly always used for converting between different units - usually degrees to or
+from radians. Therefore, `PI` is treated a bit specially by KCL and always has unknown units. This
+means that if you use `PI`, you will need to give KCL some extra information about the units of numbers.
+Usually you should use type ascription on the result of calculations, e.g., `(2 * PI): number(rad)`.
+You might prefer to use `units::toRadians` or `units::toDegrees` to convert between angles with
+different units.
 
 ### Examples
 

docs/kcl-std/consts/std-turns-HALF_TURN.md

@@ -1,11 +1,11 @@
 ---
 title: "turns::HALF_TURN"
 subtitle: "Constant in std::turns"
-excerpt: ""
+excerpt: "A half turn, 180 degrees or π radians."
 layout: manual
 ---
 
-
+A half turn, 180 degrees or π radians.
 
 ```kcl
 turns::HALF_TURN: number(deg) = 180deg

docs/kcl-std/consts/std-turns-QUARTER_TURN.md

@@ -1,11 +1,11 @@
 ---
 title: "turns::QUARTER_TURN"
 subtitle: "Constant in std::turns"
-excerpt: ""
+excerpt: "A quarter turn, 90 degrees or π/2 radians."
 layout: manual
 ---
 
-
+A quarter turn, 90 degrees or π/2 radians.
 
 ```kcl
 turns::QUARTER_TURN: number(deg) = 90deg

docs/kcl-std/consts/std-turns-THREE_QUARTER_TURN.md

@@ -1,11 +1,11 @@
 ---
 title: "turns::THREE_QUARTER_TURN"
 subtitle: "Constant in std::turns"
-excerpt: ""
+excerpt: "Three quarters of a turn, 270 degrees or 1.5*π radians."
 layout: manual
 ---
 
-
+Three quarters of a turn, 270 degrees or 1.5*π radians.
 
 ```kcl
 turns::THREE_QUARTER_TURN: number(deg) = 270deg

docs/kcl-std/consts/std-turns-ZERO.md

@@ -1,11 +1,11 @@
 ---
 title: "turns::ZERO"
 subtitle: "Constant in std::turns"
-excerpt: ""
+excerpt: "No turn, zero degrees/radians."
 layout: manual
 ---
 
-
+No turn, zero degrees/radians.
 
 ```kcl
 turns::ZERO: number = 0

docs/kcl-std/extrude.md

@@ -26,7 +26,7 @@ You can provide more than one sketch to extrude, and they will all be extruded i
 |----------|------|-------------|----------|
 | `sketches` | [`[Sketch]`](/docs/kcl-std/types/std-types-Sketch) | Which sketch or sketches should be extruded | Yes |
 | `length` | [`number`](/docs/kcl-std/types/std-types-number) | How far to extrude the given sketches | Yes |
-| `symmetric` | [`bool`](/docs/kcl-std/types/std-types-bool) | If true, the extrusion will happen symmetrically around the sketch. Otherwise, the | No |
+| `symmetric` | [`bool`](/docs/kcl-std/types/std-types-bool) | If true, the extrusion will happen symmetrically around the sketch. Otherwise, the extrusion will happen on only one side of the sketch. | No |
 | `bidirectionalLength` | [`number`](/docs/kcl-std/types/std-types-number) | If specified, will also extrude in the opposite direction to 'distance' to the specified distance. If 'symmetric' is true, this value is ignored. | No |
 | `tagStart` | [`TagDeclarator`](/docs/kcl-lang/types#TagDeclarator) | A named tag for the face at the start of the extrusion, i.e. the original sketch | No |
 | `tagEnd` | [`TagDeclarator`](/docs/kcl-lang/types#TagDeclarator) | A named tag for the face at the end of the extrusion, i.e. the new face created by extruding the original sketch | No |

docs/kcl-std/functions/std-helix.md

@@ -35,7 +35,7 @@ helix(
 
 ### Returns
 
-[`Helix`](/docs/kcl-std/types/std-types-Helix) - A helix.
+[`Helix`](/docs/kcl-std/types/std-types-Helix) - A helix; created by the `helix` function.
 
 
 ### Examples

docs/kcl-std/functions/std-math-abs.md

@@ -17,11 +17,11 @@ abs(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-acos.md

@@ -17,11 +17,11 @@ acos(@num: number(_)): number(rad)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(_)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(_)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-asin.md

@@ -17,11 +17,11 @@ asin(@num: number(_)): number(rad)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(_)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(_)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-atan.md

@@ -17,11 +17,11 @@ Consider using `atan2()` instead for the true inverse of tangent.
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(_)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(_)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-atan2.md

@@ -20,12 +20,12 @@ atan2(
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `y` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
-| `x` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `y` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
+| `x` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-ceil.md

@@ -17,11 +17,11 @@ ceil(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-cos.md

@@ -17,11 +17,11 @@ cos(@num: number(Angle)): number(_)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(_)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(_)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-floor.md

@@ -17,11 +17,11 @@ floor(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-ln.md

@@ -17,11 +17,11 @@ ln(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-log.md

@@ -27,7 +27,7 @@ and `log10` can produce more accurate results for base 10.
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-log10.md

@@ -17,11 +17,11 @@ log10(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-log2.md

@@ -17,11 +17,11 @@ log2(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-max.md

@@ -21,7 +21,7 @@ max(@input: [number; 1+]): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-min.md

@@ -21,7 +21,7 @@ min(@input: [number; 1+]): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-polar.md

@@ -21,8 +21,8 @@ cartesian (x/y/z grid) coordinates.
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `angle` | [`number(rad)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
-| `length` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `angle` | [`number(rad)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
+| `length` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 

docs/kcl-std/functions/std-math-pow.md

@@ -25,7 +25,7 @@ pow(
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-rem.md

@@ -26,7 +26,7 @@ If `num` is negative, the result will be too.
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-round.md

@@ -17,11 +17,11 @@ round(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-sin.md

@@ -17,11 +17,11 @@ sin(@num: number(Angle)): number(_)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(_)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(_)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-sqrt.md

@@ -17,11 +17,11 @@ sqrt(@input: number): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `input` | [`number`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-math-tan.md

@@ -17,11 +17,11 @@ tan(@num: number(Angle)): number(_)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(_)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(_)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-offsetPlane.md

@@ -26,7 +26,7 @@ plane and 10 units away from it.
 
 ### Returns
 
-[`Plane`](/docs/kcl-std/types/std-types-Plane) - A plane.
+[`Plane`](/docs/kcl-std/types/std-types-Plane) - An abstract plane.
 
 
 ### Examples

docs/kcl-std/functions/std-sketch-revolve.md

@@ -46,7 +46,7 @@ revolved around the same axis.
 
 ### Returns
 
-[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extrude surfaces.
+[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extruded surfaces.
 
 
 ### Examples

docs/kcl-std/functions/std-solid-chamfer.md

@@ -31,7 +31,7 @@ a sharp, straight transitional edge.
 
 ### Returns
 
-[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extrude surfaces.
+[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extruded surfaces.
 
 
 ### Examples

docs/kcl-std/functions/std-solid-fillet.md

@@ -33,7 +33,7 @@ will smoothly blend the transition.
 
 ### Returns
 
-[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extrude surfaces.
+[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extruded surfaces.
 
 
 ### Examples

docs/kcl-std/functions/std-solid-hollow.md

@@ -26,7 +26,7 @@ provided thickness remains around the exterior of the shape.
 
 ### Returns
 
-[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extrude surfaces.
+[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extruded surfaces.
 
 
 ### Examples

docs/kcl-std/functions/std-units-toCentimeters.md

@@ -8,7 +8,7 @@ layout: manual
 Convert a number to centimeters from its current units.
 
 ```kcl
-units::toCentimeters(@num: number(cm)): number(cm)
+units::toCentimeters(@num: number(Length)): number(cm)
 ```
 
 
@@ -17,11 +17,11 @@ units::toCentimeters(@num: number(cm)): number(cm)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(cm)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(cm)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(cm)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 

docs/kcl-std/functions/std-units-toDegrees.md

@@ -8,7 +8,7 @@ layout: manual
 Converts a number to degrees from its current units.
 
 ```kcl
-units::toDegrees(@num: number(deg)): number(deg)
+units::toDegrees(@num: number(Angle)): number(deg)
 ```
 
 
@@ -17,11 +17,11 @@ units::toDegrees(@num: number(deg)): number(deg)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(deg)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(deg)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(deg)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-units-toFeet.md

@@ -8,7 +8,7 @@ layout: manual
 Convert a number to feet from its current units.
 
 ```kcl
-units::toFeet(@num: number(ft)): number(ft)
+units::toFeet(@num: number(Length)): number(ft)
 ```
 
 
@@ -17,11 +17,11 @@ units::toFeet(@num: number(ft)): number(ft)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(ft)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(ft)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(ft)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 

docs/kcl-std/functions/std-units-toInches.md

@@ -8,7 +8,7 @@ layout: manual
 Convert a number to inches from its current units.
 
 ```kcl
-units::toInches(@num: number(in)): number(in)
+units::toInches(@num: number(Length)): number(in)
 ```
 
 
@@ -17,11 +17,11 @@ units::toInches(@num: number(in)): number(in)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(in)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(in)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(in)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 

docs/kcl-std/functions/std-units-toMeters.md

@@ -8,7 +8,7 @@ layout: manual
 Convert a number to meters from its current units.
 
 ```kcl
-units::toMeters(@num: number(m)): number(m)
+units::toMeters(@num: number(Length)): number(m)
 ```
 
 
@@ -17,11 +17,11 @@ units::toMeters(@num: number(m)): number(m)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(m)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(m)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(m)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 

docs/kcl-std/functions/std-units-toMillimeters.md

@@ -8,7 +8,7 @@ layout: manual
 Convert a number to millimeters from its current units.
 
 ```kcl
-units::toMillimeters(@num: number(mm)): number(mm)
+units::toMillimeters(@num: number(Length)): number(mm)
 ```
 
 
@@ -17,11 +17,11 @@ units::toMillimeters(@num: number(mm)): number(mm)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(mm)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(mm)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(mm)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 

docs/kcl-std/functions/std-units-toRadians.md

@@ -8,7 +8,7 @@ layout: manual
 Converts a number to radians from its current units.
 
 ```kcl
-units::toRadians(@num: number(rad)): number(rad)
+units::toRadians(@num: number(Angle)): number(rad)
 ```
 
 
@@ -17,11 +17,11 @@ units::toRadians(@num: number(rad)): number(rad)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(rad)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Angle)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(rad)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/functions/std-units-toYards.md

@@ -8,7 +8,7 @@ layout: manual
 Converts a number to yards from its current units.
 
 ```kcl
-units::toYards(@num: number(yd)): number(yd)
+units::toYards(@num: number(Length)): number(yd)
 ```
 
 
@@ -17,11 +17,11 @@ units::toYards(@num: number(yd)): number(yd)
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `num` | [`number(yd)`](/docs/kcl-std/types/std-types-number) | A number | Yes |
+| `num` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | A number. | Yes |
 
 ### Returns
 
-[`number(yd)`](/docs/kcl-std/types/std-types-number) - A number
+[`number(yd)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 

docs/kcl-std/lastSegX.md

@@ -21,7 +21,7 @@ lastSegX(@sketch: Sketch): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/lastSegY.md

@@ -21,7 +21,7 @@ lastSegY(@sketch: Sketch): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/legAngX.md

@@ -25,7 +25,7 @@ legAngX(
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/legAngY.md

@@ -25,7 +25,7 @@ legAngY(
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/legLen.md

@@ -25,7 +25,7 @@ legLen(
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/loft.md

@@ -35,7 +35,7 @@ The sketches need to closed and on the same plane.
 
 ### Returns
 
-[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extrude surfaces.
+[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extruded surfaces.
 
 
 ### Examples

docs/kcl-std/map.md

@@ -50,7 +50,7 @@ r = 10 // radius
 // Call `map`, using an anonymous function instead of a named one.
 circles = map(
   [1..3],
-  f = fn(id) {
+  f = fn(@id) {
     return startSketchOn(XY)
       |> circle(center = [id * 2 * r, 0], radius = r)
   },

docs/kcl-std/modules/std-array.md

@@ -1,11 +1,11 @@
 ---
 title: "array"
 subtitle: "Module in std"
-excerpt: ""
+excerpt: "Functions for manipulating arrays of values. "
 layout: manual
 ---
 
-
+Functions for manipulating arrays of values. 
 
 
 

docs/kcl-std/modules/std-math.md

@@ -1,11 +1,11 @@
 ---
 title: "math"
 subtitle: "Module in std"
-excerpt: ""
+excerpt: "Functions for mathematical operations and some useful constants. "
 layout: manual
 ---
 
-
+Functions for mathematical operations and some useful constants. 
 
 
 

docs/kcl-std/modules/std-sketch.md

@@ -1,13 +1,13 @@
 ---
 title: "sketch"
 subtitle: "Module in std"
-excerpt: ""
+excerpt: "Sketching is the foundational activity for most KCL programs. A sketch is a two-dimensional drawing made from paths or shapes. A sketch is always drawn on a surface (either an abstract plane of a face of a solid). A sketch can be made into a solid by extruding it (or revolving, etc.). "
 layout: manual
 ---
 
+Sketching is the foundational activity for most KCL programs. A sketch is a two-dimensional drawing made from paths or shapes. A sketch is always drawn on a surface (either an abstract plane of a face of a solid). A sketch can be made into a solid by extruding it (or revolving, etc.). 
 
-
-
+This module contains functions for creating and manipulating sketches, and making them into solids. 
 
 
 ## Functions and constants

docs/kcl-std/modules/std-solid.md

@@ -1,11 +1,11 @@
 ---
 title: "solid"
 subtitle: "Module in std"
-excerpt: ""
+excerpt: "This module contains functions for modifying solids, e.g., by adding a fillet or chamfer, or removing part of a solid. "
 layout: manual
 ---
 
-
+This module contains functions for modifying solids, e.g., by adding a fillet or chamfer, or removing part of a solid. 
 
 
 

docs/kcl-std/modules/std-transform.md

@@ -1,11 +1,11 @@
 ---
 title: "transform"
 subtitle: "Module in std"
-excerpt: ""
+excerpt: "This module contains functions for transforming sketches and solids. "
 layout: manual
 ---
 
-
+This module contains functions for transforming sketches and solids. 
 
 
 

docs/kcl-std/modules/std-turns.md

@@ -1,11 +1,11 @@
 ---
 title: "turns"
 subtitle: "Module in std"
-excerpt: ""
+excerpt: "This module contains a few handy constants for defining turns. "
 layout: manual
 ---
 
-
+This module contains a few handy constants for defining turns. 
 
 
 

docs/kcl-std/modules/std-types.md

@@ -1,13 +1,13 @@
 ---
 title: "types"
 subtitle: "Module in std"
-excerpt: ""
+excerpt: "KCL types. This module contains fundamental types like `number`, `string`, `Solid`, and `Sketch`. "
 layout: manual
 ---
 
+KCL types. This module contains fundamental types like `number`, `string`, `Solid`, and `Sketch`. 
 
-
-
+Types can (optionally) be used to describe a function's arguments and returned value. They are checked when a program runs and can help avoid errors. They are also useful to help document what a function does. 
 
 
 

docs/kcl-std/modules/std-units.md

@@ -7,7 +7,9 @@ layout: manual
 
 Functions for converting numbers to different units. 
 
+All numbers in KCL include units, e.g., the number `42` is always '42 mm' or '42 degrees', etc. it is never just '42'. For more information, see [numeric types](/docs/kcl-lang/numeric). 
 
+Note that you only need to explicitly convert the units of a number if you need a specific unit for your own calculations. When calling a function, KCL will convert a number to the required units automatically (where possible, and give an error or warning if it's not possible). 
 
 
 ## Functions and constants

docs/kcl-std/modules/std.md

@@ -9,6 +9,10 @@ The KCL standard library
 
 Contains frequently used constants, functions for interacting with the KittyCAD servers to create sketches and geometry, and utility functions. 
 
+The standard library is organised into modules (listed below), but most things are always available in KCL programs. 
+
+You might also want the [KCL language reference](/docs/kcl-lang) or the [KCL guide](). 
+
 ## Modules
 
 * [`array`](/docs/kcl-std/modules/std-array)

docs/kcl-std/pop.md

@@ -8,7 +8,7 @@ layout: manual
 Remove the last element from an array.
 
 ```kcl
-pop(@array: [any]): any
+pop(@array: [any]): [any]
 ```
 
 Returns a new array with the last element removed.
@@ -21,7 +21,7 @@ Returns a new array with the last element removed.
 
 ### Returns
 
-[`any`](/docs/kcl-std/types/std-types-any) - Any KCL value.
+[`[any]`](/docs/kcl-std/types/std-types-any)
 
 
 ### Examples

docs/kcl-std/profileStartX.md

@@ -21,7 +21,7 @@ profileStartX(@profile: Sketch): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/profileStartY.md

@@ -21,7 +21,7 @@ profileStartY(@profile: Sketch): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/push.md

@@ -11,7 +11,7 @@ Append an element to the end of an array.
 push(
   @array: [any],
   item: any,
-): any
+): [any]
 ```
 
 Returns a new array with the element appended.
@@ -25,7 +25,7 @@ Returns a new array with the element appended.
 
 ### Returns
 
-[`any`](/docs/kcl-std/types/std-types-any) - Any KCL value.
+[`[any]`](/docs/kcl-std/types/std-types-any)
 
 
 ### Examples

docs/kcl-std/reduce.md

@@ -34,8 +34,8 @@ reduce(
 
 ```kcl
 // This function adds two numbers.
-fn add(a, b) {
-  return a + b
+fn add(@a, accum) {
+  return a + accum
 }
 
 // This function adds an array of numbers.
@@ -49,7 +49,7 @@ fn sum(@arr) {
 fn sum(arr):
     sumSoFar = 0
     for i in arr:
-        sumSoFar = add(sumSoFar, i)
+        sumSoFar = add(i, sumSoFar)
     return sumSoFar */
 
 // We use `assert` to check that our `sum` function gives the
@@ -72,8 +72,8 @@ arr = [1, 2, 3]
 sum = reduce(
   arr,
   initial = 0,
-  f = fn(i, result_so_far) {
-    return i + result_so_far
+  f = fn(@i, accum) {
+    return i + accum
   },
 )
 
@@ -105,11 +105,11 @@ fn decagon(@radius) {
   fullDecagon = reduce(
     [1..10],
     initial = startOfDecagonSketch,
-    f = fn(i, partialDecagon) {
+    f = fn(@i, accum) {
       // Draw one edge of the decagon.
       x = cos(stepAngle * i) * radius
       y = sin(stepAngle * i) * radius
-      return line(partialDecagon, end = [x, y])
+      return line(accum, end = [x, y])
     },
   )
 

docs/kcl-std/segAng.md

@@ -21,7 +21,7 @@ segAng(@tag: TagIdentifier): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/segEndX.md

@@ -21,7 +21,7 @@ segEndX(@tag: TagIdentifier): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/segEndY.md

@@ -21,7 +21,7 @@ segEndY(@tag: TagIdentifier): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/segLen.md

@@ -21,7 +21,7 @@ segLen(@tag: TagIdentifier): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/segStartX.md

@@ -21,7 +21,7 @@ segStartX(@tag: TagIdentifier): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/segStartY.md

@@ -21,7 +21,7 @@ segStartY(@tag: TagIdentifier): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/tangentToEnd.md

@@ -21,7 +21,7 @@ tangentToEnd(@tag: TagIdentifier): number
 
 ### Returns
 
-[`number`](/docs/kcl-std/types/std-types-number) - A number
+[`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
 ### Examples

docs/kcl-std/types/std-types-Axis2d.md

@@ -1,11 +1,11 @@
 ---
 title: "Axis2d"
 subtitle: "Type in std::types"
-excerpt: "An infinite line in 2d space."
+excerpt: "An abstract and infinite line in 2d space."
 layout: manual
 ---
 
-An infinite line in 2d space.
+An abstract and infinite line in 2d space.
 
 
 

docs/kcl-std/types/std-types-Axis3d.md

@@ -1,11 +1,11 @@
 ---
 title: "Axis3d"
 subtitle: "Type in std::types"
-excerpt: "An infinite line in 3d space."
+excerpt: "An abstract and infinite line in 3d space."
 layout: manual
 ---
 
-An infinite line in 3d space.
+An abstract and infinite line in 3d space.
 
 
 

docs/kcl-std/types/std-types-Edge.md

@@ -1,11 +1,11 @@
 ---
 title: "Edge"
 subtitle: "Type in std::types"
-excerpt: "The edge of a solid."
+excerpt: "An edge of a solid."
 layout: manual
 ---
 
-The edge of a solid.
+An edge of a solid.
 
 
 

docs/kcl-std/types/std-types-Face.md

@@ -1,11 +1,11 @@
 ---
 title: "Face"
 subtitle: "Type in std::types"
-excerpt: "A face."
+excerpt: "A face of a solid."
 layout: manual
 ---
 
-A face.
+A face of a solid.
 
 
 

docs/kcl-std/types/std-types-Helix.md

@@ -1,11 +1,11 @@
 ---
 title: "Helix"
 subtitle: "Type in std::types"
-excerpt: "A helix."
+excerpt: "A helix; created by the `helix` function."
 layout: manual
 ---
 
-A helix.
+A helix; created by the `helix` function.
 
 
 

docs/kcl-std/types/std-types-Plane.md

@@ -1,13 +1,31 @@
 ---
 title: "Plane"
 subtitle: "Type in std::types"
-excerpt: "A plane."
+excerpt: "An abstract plane."
 layout: manual
 ---
 
-A plane.
-
-
+An abstract plane.
+
+A plane has a position and orientation in space defined by its origin and axes. A plane is abstract
+in the sense that it is not part of the objects being drawn. A plane can be used to sketch on.
+
+A plane can be created in several ways:
+- you can use one of the default planes, e.g., `XY`.
+- you can use `offsetPlane` to create a new plane offset from an existing one, e.g., `offsetPlane(XY, offset = 150)`.
+- you can use negation to create a plane from an existing one which is identical but has an opposite normal
+e.g., `-XY`.
+- you can define an entirely custom plane, e.g.,
+
+```js
+myXY = {
+  origin = { x = 0, y = 0, z = 0 },
+  xAxis = { x = 1, y = 0, z = 0 },
+  yAxis = { x = 0, y = 1, z = 0 },
+}
+```
+
+Any object with appropriate `origin`, `xAxis`, and `yAxis` fields can be used as a plane.