I'm trying to render an architectural design.  My CAD system generates
(inter alia) the following:
polygon { 5,
<-41.486087666667,0.272721000000,-5.718333333333>,
<-41.484943666667,0.271479000000,-5.717189333333>,
<-41.484891666667,0.272721000000,-5.719251333333>,
<-41.486087666667,0.272721000000,-5.718333333333>,
<-41.486087666667,0.272721000000,-5.718333333333>
texture {Soft_blue
}
}
- which causes "Parse Error: singular matrix in MInvers".  Actually my model
contains hundreds of polygons that generate this message.
What is it about the polygon that causes this?  Are the points not coplanar?
 (I've tried removing the final point - makes no difference).
I can't easily change either the contents of the model (supplied by a third
party) or the CAD system (ditto) so my scope for experimentation is
limited.  I just need to know who to complain to!
Apparently the same data file renders correctly under a different operating
system, so it may be a rounding issue.  Surely POVRay can't be so sensitive
to coplanarity or the polygon primitive would fail this way all the time?

TIA for any ideas

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