# extrude3d

##### Generate extrusion mesh

Given a two-dimensional polygon, this generates a three-dimensional extrusion of the shape by triangulating the polygon and creating a cylinder with that shape as the end faces.

- Keywords
- graphics

##### Usage

`extrude3d(x, y = NULL, thickness = 1, smooth = FALSE, ...)`

##### Arguments

- x, y
A polygon description in one of the forms supported by

`triangulate`

.- thickness
The extrusion will have this thickness.

- smooth
logical; should normals be added so that the edges of the extrusion appear smooth?

- …
Other parameters to pass to

`tmesh3d`

when constructing the mesh.

##### Details

The extrusion is always constructed with the polygon in the xy plane at
`z = 0`

and another copy at `z = thickness`

. Use
the transformation functions (e.g. `rotate3d`

) to
obtain other orientations and placements.

##### Value

A mesh object containing a triangulation of the polygon for each face, and quadrilaterals for the sides.

##### See Also

`polygon3d`

for a simple polygon, `triangulate`

for
the triangulation, `turn3d`

for a solid of rotation.

##### Examples

```
# NOT RUN {
x <- c(1:10, 10:1)
y <- rev(c(rep(c(0, 2), 5), rep(c(1.5, -0.5), 5)))
plot(x, y, type = "n")
polygon(x, y)
open3d()
shade3d( extrude3d(x, y), col = "red" )
# }
```

*Documentation reproduced from package rgl, version 0.100.50, License: GPL*