I ran into this when writing the particle system patch. The vector 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);
...


I deleted the VLength and VInverseScaleEq, and rewrote it like this:

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

  VNormalize(V1, Vect);
...

-- 
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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