vpscale(3) - Linux man page

Name

vpScale - multiply the current transformation matrix by a scaling matrix

Synopsis

#include <volpack.h>

vpResult

vpScale(vpc, sx, sy, sz): vpContext *vpc;
double sx.FA double sy.FA double sz.FE

Arguments

vpc
VolPack context from vpCreateContext.
sx
Scale factor for the X dimension.
sy
Scale factor for the Y dimension.
sz
Scale factor for the Z dimension.

Description

vpScale is used to multiply the current transformation matrix by a 4-by-4 scaling matrix. The arguments specify independent scale factors for each of the three cartesian axes. The scaling matrix is:

sx 0 0 0 0 sy 0 0 0 0 sz 0 0 0 0 1
Use vpCurrentMatrix to set the current transformation matrix. By default, the scaling matrix is post-multiplied (M = M*S where M is the current matrix and S is the scaling matrix). The VP_CONCAT_MODE option to vpSeti can be used to select pre-multiplication.

State Variables

The current matrix concatenation parameters can be retrieved with the following state variable codes (see vpgeti(3)): VP_CURRENT_MATRIX, VP_CONCAT_MODE.

Errors

The return value is always VP_OK.