On 09.07.11 18:13, folkert wrote:
>>> While rending a generated script, I get:
>>>
>>> File: test.pov  Line: 16077
>>> Parse Warning: Points in polygon are not co-planar. Ignoring polygons.
>>>
>>> The line is:
>>> polygon { 5<110, 25, 2>,<111, 25, 2>,<111, 26, 3>,<110, 26, 2>,<110,
>>> 25, 2>
>>> texture{pigment{rgb<0, 0.461435456673892, 0.443295311143663>}} }
>>>
>>> What is wrong and how can I fix it?
>>
>> google is your friend : http://www.povray.org/documentation/view/3.6.0/294/
>
> Yes, ok, but how do I fix this?
> Should I split it (it is a square) in 2 triangles? Or do the same rules apply?

Your problem is that the polygon is not a square. It would only be a square 
if it was coplanar. Coplanar means the points are in one plane (which does 
*not* mean the plane has to be axis aligned!), as otherwise the polygon's 
plane is not fully defined - imagine a sheet of paper that you hold on to 
diagonal corners. Depending on which corner of the two possible diagonal 
corners you pick, it will be a different shape. The same problem exists with 
a polygon with more than three corners. You have to pick the corner 
coordinates properly for it to be in one plane.

See:
<http://en.wikipedia.org/wiki/Coplanarity>

You can search for the error message:
<http://www.google.com/search?q=Points+in+polygon+are+not+co-planar.+Ignoring+polygons.>

This will lead you to:
<http://news.povray.org/povray.newusers/thread/%3C419e827f$1@news.povray.org%3E/>

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