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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.
extrude3d(x, y = NULL, thickness = 1, smooth = FALSE, ...)A mesh object containing a triangulation of the polygon for each face, and quadrilaterals for the sides.
A polygon description in one of the forms supported by triangulate.
The extrusion will have this thickness.
logical; should normals be added so that the edges of the extrusion appear smooth?
Other parameters to pass to tmesh3d when constructing the
mesh.
Duncan Murdoch
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.
polygon3d for a simple polygon, triangulate for
the triangulation, turn3d for a solid of rotation.
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" )
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