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vpScale(3) FreeBSD Library Functions Manual vpScale(3)

vpScale - multiply the current transformation matrix by a scaling matrix

#include <volpack.h>
vpResult
vpScale(vpc, sx, sy, sz)
vpContext *vpc;
double sx
double sy
double sz

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.

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.

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

The return value is always VP_OK.

VolPack(3), vpCreateContext(3), vpCurrentMatrix(3)
VolPack

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