Constructs a mesh of line segments corresponding to non-shared (i.e. boundary) edges of triangles or quads in the original mesh.
getBoundary3d(mesh, sorted = FALSE, simplify = TRUE, ...)A "mesh3d" object containing 0 or more segments.
A mesh object.
Whether the result should have the segments sorted in sequential order.
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.
Material properties to apply to the mesh.
Duncan Murdoch
mesh3d
x <- cube3d(col = "blue")
x$ib <- x$ib[,-(1:2)]
b <- getBoundary3d(x, sorted = TRUE, col = "black")
open3d()
shade3d(x, alpha=0.2)
shade3d(b)
# Show edge vertices in sequence:
text3d(t(b$vb), texts = 1:ncol(b$vb), adj = 0)
c(b$is[1,1], b$is[2,])
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