90 lines
313 KiB
Markdown
90 lines
313 KiB
Markdown
---
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title: "hollow"
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subtitle: "Function in std::solid"
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excerpt: "Make the inside of a 3D object hollow."
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layout: manual
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---
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Make the inside of a 3D object hollow.
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```kcl
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hollow(
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@solid: Solid,
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thickness: number(Length),
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): Solid
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```
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Remove volume from a 3-dimensional shape such that a wall of the
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provided thickness remains around the exterior of the shape.
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### Arguments
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| Name | Type | Description | Required |
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|----------|------|-------------|----------|
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| `solid` | [`Solid`](/docs/kcl-std/types/std-types-Solid) | Which solid to hollow out | Yes |
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| `thickness` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | The thickness of the remaining shell | Yes |
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### Returns
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[`Solid`](/docs/kcl-std/types/std-types-Solid) - A solid is a collection of extruded surfaces.
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### Examples
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```kcl
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// Hollow a basic sketch.
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firstSketch = startSketchOn(XY)
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|> startProfile(at = [-12, 12])
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|> line(end = [24, 0])
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|> line(end = [0, -24])
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|> line(end = [-24, 0])
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|> close()
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|> extrude(length = 6)
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|> hollow(thickness = 0.25)
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```
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```kcl
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// Hollow a basic sketch.
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firstSketch = startSketchOn(-XZ)
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|> startProfile(at = [-12, 12])
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|> line(end = [24, 0])
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|> line(end = [0, -24])
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|> line(end = [-24, 0])
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|> close()
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|> extrude(length = 6)
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|> hollow(thickness = 0.5)
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```
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```kcl
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// Hollow a sketch on face object.
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size = 100
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case = startSketchOn(-XZ)
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|> startProfile(at = [-size, -size])
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|> line(end = [2 * size, 0])
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|> line(end = [0, 2 * size])
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|> tangentialArc(endAbsolute = [-size, size])
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|> close()
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|> extrude(length = 65)
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thing1 = startSketchOn(case, face = END)
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|> circle(center = [-size / 2, -size / 2], radius = 25)
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|> extrude(length = 50)
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thing2 = startSketchOn(case, face = END)
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|> circle(center = [size / 2, -size / 2], radius = 25)
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|> extrude(length = 50)
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hollow(case, thickness = 0.5)
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```
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