1vpScale(3)                 Library Functions Manual                 vpScale(3)
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NAME

6       vpScale  -  multiply  the  current  transformation  matrix by a scaling
7       matrix
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SYNOPSIS

10       #include <volpack.h>
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12       vpResult
13       vpScale(vpc, sx, sy, sz)
14           vpContext *vpc;
15           double sx.FA double sy.FA double sz.FE

ARGUMENTS

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

DESCRIPTION

22       vpScale is used to multiply the  current  transformation  matrix  by  a
23       4-by-4 scaling matrix.  The arguments specify independent scale factors
24       for  each  of  the  three  cartesian  axes.   The  scaling  matrix  is:
25        sx   0   0   0
26         0  sy   0   0
27         0   0  sz   0
28         0   0   0   1  Use  vpCurrentMatrix to set the current transformation
29       matrix.  By default, the scaling matrix is  post-multiplied  (M  =  M*S
30       where  M  is  the  current  matrix  and  S is the scaling matrix).  The
31       VP_CONCAT_MODE option to vpSeti can be used to  select  pre-multiplica‐
32       tion.

STATE VARIABLES

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

ERRORS

38       The return value is always VP_OK.

SEE ALSO

40       VolPack(3), vpCreateContext(3), vpCurrentMatrix(3)
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44VolPack                                                             vpScale(3)