I ran into this when writing the particle system patch. The vector 
parameter V1 is modified by the function, which normalizes it for 
internal use. The function starts off like this:


void Compute_Axis_Rotation_Transform (TRANSFORM *transform, VECTOR V1, 
DBL angle)
{
  DBL l, cosx, sinx;

  VLength(l, V1);
  VInverseScaleEq(V1, l);
....


The fix:
I replaced the VLength and VInverseScaleEq with VNormalize, and added a 
local vector for the normalized version.

void Compute_Axis_Rotation_Transform (TRANSFORM *transform, VECTOR 
AxisVect, DBL angle)
{
  DBL cosx, sinx;
  VECTOR V1;

  VNormalize(V1, AxisVect);
....

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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