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as.mesh3d.ashape3d converts an
alphashape3d::ashape3d object into a nat/rgl compatible
mesh3d surface
Note that this provides a link to the Rvcg package
# S3 method for ashape3d
as.mesh3d(x, tri_to_keep = 2L, ...)# S3 method for hxsurf
as.mesh3d(x, Regions = NULL, material = NULL, drop = TRUE, ...)
a mesh3d object which can be plotted and
manipulated using rgl and nat packages.
Object to convert to mesh3d
Which alphashape triangles to keep (expert use only - see
triang entry in Value section of
ashape3d docs for details.)
Additional arguments for methods
Character vector or regions to select from hxsurf
object
rgl materials such as color
Whether to drop unused vertices (default TRUE)
An alpha shape is a generalisation of a convex hull enclosing a set of points. Unlike a convex hull, the resultant surface can be partly concave allowing the surface to more closely follow the set of points.
In this implementation, the parameter alpha is a scale factor with units of length that defines a spatial domain. When alpha is larger the alpha shape approaches the convex hull; when alpha is smaller the alpha shape has a greater number of faces / vertices i.e. it follows the points more closely.
ashape3d, mesh3d
as.mesh3d, tmesh3d,
as.hxsurf, read.hxsurf
Other hxsurf:
as.hxsurf(),
materials(),
plot3d.hxsurf(),
read.hxsurf(),
subset.hxsurf(),
write.hxsurf()
# \donttest{
library(alphashape3d)
kcs20.a=ashape3d(xyzmatrix(kcs20), alpha = 10)
plot(kcs20.a)
# convert to mesh3d
kcs20.mesh=as.mesh3d(kcs20.a)
# check that all points are inside mesh
all(pointsinside(kcs20, kcs20.mesh))
# and show that we can also use the alphashape directly
all(pointsinside(kcs20, kcs20.a))
clear3d()
wire3d(kcs20.mesh)
plot3d(kcs20, col=type, lwd=2)
# }
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