R: generic subdivision surface method

subdivision3d {rgl}

R Documentation

generic subdivision surface method

Description

The Subdivision surface algorithm divide and refine (deform) a given mesh recursively to certain degree (depth). The qmesh3d algorithm consists of two stages: divide and deform. The divide step generates for each quad four new quads, the deform step drags the points (refinement step).

Usage

  subdivision3d( x,  ...)
  subdivision3d.qmesh3d( x, depth=1, normalize=FALSE, deform=TRUE, ... )
  divide.qmesh3d(mesh,  vb=mesh$vb, ib=mesh$ib )
  normalize.qmesh3d(mesh)
  deform.qmesh3d(mesh,vb=mesh$vb,ib=mesh$ib)

Arguments

`x`	3d geometry mesh
`mesh`	3d geometry mesh
`depth`	recursion depth
`normalize`	normalize qmesh3d coordinates after division if deform is TRUE otherwise
`deform`	deform mesh after normalization
`ib`	vector of indices (i.e., which sets of vertices to combine into quads); 4xn matrix or equivalent vector
`vb`	vector of vertices: 4xn matrix (rows x,y,z,h) or equivalent vector, where h indicates scaling of each plotted quad
`...`	other arguments (unused)

Details

Generic subdivision surface method. Currently there exists an algorithm that can be applied on qmesh3d objects.

Examples

  shade3d( subdivision3d( cube3d(), depth=3 ), color="red", alpha=0.5 )