vcgClost: Project coordinates onto a target triangular surface mesh.

In zarquon42b/Rvcg: Manipulations of Triangular Meshes Based on the 'VCGLIB' API

Project coordinates onto a target triangular surface mesh.

Description

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

Usage

vcgClost(
  x,
  mesh,
  sign = TRUE,
  barycentric = FALSE,
  smoothNormals = FALSE,
  borderchk = FALSE,
  tol = 0,
  facenormals = 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.
tol	maximum distance to search. If distance is beyond that, the original point will be kept and the distance set to NaN. If tol = 0, tol is set to 2*diagonal of the bounding box of mesh.
facenormals	logical: if TRUE only the facenormal of the face the closest point has hit is returned, the weighted average of the surrounding vertex normals otherwise.
...	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.
faceptr	vector of face indeces on which the closest points are located

Note

If large part of the reference mesh are far away from the target surface, calculation can become very slow. In that case, the function vcgClostKD will be significantly faster.

Author(s)

Stefan Schlager

References

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

See Also

vcgPlyRead

Examples

data(humface)
clost <- vcgClost(humface.lm, humface)

zarquon42b/Rvcg documentation built on April 11, 2024, 3:17 a.m.