Rvcg (version 0.12.2)

vcgClostKD: Project coordinates onto a target triangular surface mesh using KD-tree search

Description

For a set of 3D-coordinates/triangular mesh, the closest matches on a target surface are determined (by using KD-tree search) and normals at as well as distances to that point are calculated.

Usage

vcgClostKD(x, mesh, sign = TRUE, barycentric = FALSE,
  smoothNormals = FALSE, borderchk = FALSE, k = 50, nofPoints = 16,
  maxDepth = 64, angdev = NULL, weightnorm = FALSE, ...)

Arguments

x

k x 3 matrix containing 3D-coordinates or object of class "mesh3d".

mesh

triangular surface mesh stored as object of class "mesh3d".

sign

logical: if TRUE, signed distances are returned.

barycentric

logical: if TRUE, barycentric coordinates of the hit points are returned.

smoothNormals

logical: if TRUE, laplacian smoothed normals are used.

borderchk

logical: request checking if the hit face is at the border of the mesh.

k

integer: check the kdtree for thek closest faces (using faces' barycenters.

nofPoints

integer: number of points per cell in the kd-tree (don't change unless you know what you are doing!)

maxDepth

integer: depth of the kd-tree (don't change unless you know what you are doing!)

angdev

maximum deviation between reference and target normals. If the none of the k closest triangles match this criterion, the closest point on the closest triangle is returned but the corresponding distance in $quality is set to 1e5.

weightnorm

logical if angdev is set, this requests the normal of the closest points to be estimated by weighting the surrounding vertex normals. Otherwise, simply the hit face's normal is used (faster but slightly less accurate).

...

additional parameters, currently unused.

Value

• returns an object of class "mesh3d" with:
• vb
  4 x n matrix containing n vertices as homolougous coordinates.
• normals
  4 x n matrix containing vertex normals.
• quality
  numeric vector containing distances to target.
• it
  3 x m integer matrix containing vertex indices forming triangular faces.Only available, when x is a mesh.
• border
  integer vector of length n: if borderchk = TRUE, for each clostest point the value will be 1 if the hit face is at the border of the target mesh and 0 otherwise.
• barycoords
  3 x m Matrix containing barycentric coordinates of closest points; only available if barycentric=TRUE.

References

Baerentzen, Jakob Andreas. & Aanaes, H., 2002. Generating Signed Distance Fields From Triangle Meshes. Informatics and Mathematical Modelling. #'

See Also

vcgPlyRead