The scaling of normals has been modified in megapov so that the orientation
of the normals follows the scaling (and thus simulates a "heightfied" applied
to the surface of the object).
  This is ok in most cases. However, sometimes one wants to scale the
_pattern_, not the normals. For example if I want a kind of wood pattern
but with concentric ellipses instead of circles, I could just scale the
wood pattern unevenly so that it becomes an elliptical pattern. However
this scaling affects the normals, which is not the behaviour I wanted. I
just wanted to scale the pattern, not the normals.
  A recent case that happened to me is this: I wanted a spiral pattern that
doesn't twist itself along the z axis but it's rather constant. What I did
was to scale the pattern very long in the z direction, thus getting the effect
I wanted. Although I did this in the official povray (where it didn't affect
the normals), I think that this trick wouldn't work in megapov since the
normals would be scaled too.
  I think that there should be a way to scale the pattern itself, independently
of the normals.
  Does this make any sense?

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

Post a reply to this message