polygon2tri: Decomposes a polygon in triangles.
In tunelipt/model3d: Funções para manipulação de modelos 3D.

Description Usage Arguments Value Examples

Given a a simple convex polygon, this function decomposes it into triangles. The result is a mesh object (mesh3d for 3d polygons) that is a 3D array where the first index is the coordinate (x, y or z), the second the vertex (1, 2, 3) and the third the triangle number.

1	polygon2tri(p)

p

Polygon

Array containing the triangles.

p <- newPolygon(c(0, 1, 2, 1, 0), c(0, 0, 1, 2, 2))
tri <- polygon2tri(p)
plot(tri[1,,], tri[2,,])
for (i in 1:dim(tri)[3]) polygon(tri[1,,i], tri[2,,i])