vcgClostKD: Project coordinates onto a target triangular surface mesh...

Description Usage Arguments Value Note Author(s) References See Also

View source: R/vcgClostKD.r

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

1
2
3
4
vcgClostKD(x, mesh, sign = TRUE, barycentric = FALSE,
  smoothNormals = FALSE, borderchk = FALSE, k = 50, nofPoints = 16,
  maxDepth = 64, angdev = NULL, weightnorm = FALSE,
  facenormals = FALSE, threads = 1, ...)

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)

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.

threads

integer: threads to use in closest point search.

...

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.

Note

Other than vcgClost this does not search a grid, but first uses a KD-tree search to find the k closest barycenters for each point and then searches these faces for the closest match.

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


zarquon42b/Rvcg documentation built on Jan. 17, 2019, 9:10 a.m.