Ben Olmstead/BEM wrote in message <36F4000C.AD914AA8@mad.scientist.com>...
>/* I believe that I have found a bug in POV-Ray.

<snip>
> * This is what I have found:
> * When the angle on the rotation below is less than (not equal to) 90,
> * the green triangle below will not be displayed.  (With d set to 1/3,
> * the three triangles should form a larger, equilateral triangle.)
> * With the rotation at 90 or greater, it works fine.  If I change the
> * union to a mesh (and move the pigments out of the triangles,
> * obviously), it works fine.  If I comment out either of the other two
> * triangles, the green triangle will be displayed.  I have checked, and
> * all three triangles' vertices are specified in the same direction.
> * (Clockwise or counterclockwise, depending where you look from.)  (Not
> * that that should have any effect, but it normally does in realtime 3D
> * renderers.)
<snip>

I seem to be able to render the green triangle fine at all rotations.  I'm
using Windows 95 POV3.1e.  Perhaps the problem is one of shading (since I
think the default is to have an ambient finish of zero?) - have you tried
using textures with an ambient value of 1, just to check this?  Or perhaps
have a bright background, so at least the shadow could be seen ?  Though I
used exactly the same shape, I did use my own camera and light definitions
(yours did not appear to show any of the shape regardless!)


Matt

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