R: Extract the boundary of a mesh

getBoundary3d {rgl}

R Documentation

Extract the boundary of a mesh

Description

Constructs a mesh of line segments corresponding to non-shared (i.e. boundary) edges of triangles or quads in the original mesh.

Usage

getBoundary3d(mesh, sorted = FALSE, simplify = TRUE)

Arguments

`mesh`	A mesh object.
`sorted`	Whether the result should have the segments sorted in sequential order.
`simplify`	Whether to simplify the resulting mesh, dropping all unused vertices. If `FALSE`, the vertices of the result will be identical to the vertices of `mesh`; if `TRUE`, they will likely be different, even if no vertices were dropped.

Value

A "mesh3d" object containing 0 or more segments.

Author(s)

Duncan Murdoch

Examples

x <- cube3d()
x$ib <- x$ib[,-(1:2)]
b <- getBoundary3d(x, sorted = TRUE)

open3d()
shade3d(x, alpha=0.2, col = "blue")

shade3d(b) 

# Show edge vertices in sequence:
text3d(t(b$vb), text = 1:ncol(b$vb), adj = 0)
c(b$is[1,1], b$is[2,])

[Package rgl version 0.108.3.2 Index]