Hi All!

See povray.newusers: "system in turbulence" for the roots of this
threat.

 When I started the thread my problem was, that with a simple
turbulence in a wood pigment POVRay produced the upper part of the
attached image. There are those larger scaled areas and when you take
the camera further away you will see that there's a "system" along the
axises or somehow a grid.
 I searched a reason and a workaround in povray.newusers. And I found
one. But that's surprisingly. Because the workaround is, to take the
turbulence into a warp statement. You get the lower image, then (there
is no system or grid anymore). But that's strange because I thought,
that a turbulence-warp-statment just make POVRay take care of the
order of transformations and warps - turbulence is not necessarily
applied first as it is otherwise.
 But in my example there are no other warps and no transformations at
all! There shouldn't be a difference if I'm right.
What is the other effect of the turbulence warp?

To generate the images below, use this code and comment/uncomment one
of the turbulences.

camera{location z*30 look_at 0}
plane {z,0
 pigment {wood
  color_map {[0.0 color rgb 0][1.0 color rgb 1]}
/*  warp {turbulence .15} */
  turbulence
 }
 finish {ambient 1}
}
(Sorry to post a scenefile in a not appropriate group but it's that
small, I hope you can forgive me)

Can anybody tell me what's going on here?
Thank you!

cukk

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