as.mesh3d  R Documentation 
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 class 'ashape3d' as.mesh3d(x, tri_to_keep = 2L, ...) ## S3 method for class 'hxsurf' as.mesh3d(x, Regions = NULL, material = NULL, drop = TRUE, ...)
x 
Object to convert to mesh3d 
tri_to_keep 
Which alphashape triangles to keep (expert use only  see

... 
Additional arguments for methods 
Regions 
Character vector or regions to select from 
material 
rgl materials such as 
drop 
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.
a mesh3d
object which can be plotted and
manipulated using rgl
and nat
packages.
ashape3d
, mesh3d
as.mesh3d
, tmesh3d
,
as.hxsurf
, read.hxsurf
Other hxsurf:
as.hxsurf()
,
materials()
,
plot3d.hxsurf()
,
read.hxsurf()
,
subset.hxsurf()
,
write.hxsurf()
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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