Convert tris faces to quad faces by simple merging.

This is experimental. Note that it can only work if the number of 'tris_faces' is even, as two consecutive tris-faces will be merged into one quad face. We could set the index to NA in that case, but I do not know how FreeSurfer handles this, so we do not guess.

Usage

faces.tris.to.quad(tris_faces)

Arguments

tris_faces

nx3 integer matrix, the indices of the vertices making up the n tris faces.

Value

n/2x4 integer matrix, the indices of the vertices making up the n quad faces.

Note

This function does not implement proper remeshing of tri-meshes to quad-meshes. Use a proper mesh library if you need that.