Samuel Benge <stb### [at] hotmailcom> wrote:
> Are you trying this with surface subdivision? That mesh object looks
> *very* familiar :) If you are trying it with SS, you might want to take
> the SS block out of the mesh2 statement and see if you still get strange
> results.
>
> The only mesh-csg I've tried so far has been with height_fields (which
> work very well in csg operations).
>
> -Sam


There's no subdivision or other fancy stuff at all.
The reason why it looks *very* familiar is that it is coming as a demo scene
with Povray 3.6 and you can find it in scenes/objects/mesh2.pov. For Fig 2.
I did the following replacement:
----( original code )-------------------------------------------------
object {
  Mesh_A
  texture { Mesh_TextureA }
  rotate 180*z
  rotate 90*x
  translate <-2, -2, 1.5>
}
----( replacement code )----------------------------------------------
difference {
  object {
    Mesh_A
    texture { Mesh_TextureA }
    rotate 180*z
    rotate 90*x
  }
  plane {
    -y,0
  }
  translate <-3, -2, 1.5>
}
----------------------------------------------------------------------

The other objects are similar but I added the red cutting "planes" for
reference. The code (without rotation and translation) is:
----( "plane" code )--------------------------------------------------
box {
  -2,2
  scale <1,1,.00001>
    pigment { color rgb x transmit .9 }
    no_shadow
}
----------------------------------------------------------------------

Before posting the image I changed the camera to 1:1 ratio (right x) for a
smaller image and added the numbers in GIMP.

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