On 11/29/24 18:20, folkert wrote:
> Hi,
> 
> I'm trying to render a simple script:
> 
> polygon { 5, <15.45085, 0, 47.55283>, <15.11321, -3.212412, 47.55283>,
> <24.45369, -5.197792, 43.30127>, <25, 0, 43.30127>, <15.45085, 0, 47.55283>
> texture { pigment { color rgb <1, 0, 0> } } }
> 
> sky_sphere { pigment { color rgb <1, 1, 1> } }
> camera { look_at <15, -3, 47> location <0, 0, 100> }
> light_source { <0, 0, 100> color rgb <1, 1, 1> }
> 
> 
> The red polygon is not visible. Any ideas why?
> 

The polygon is set up as a 2D object sitting in an x,y plane somewhere 
along z.

The normal way to specify it is to use 2D vectors of <x,y> or <u,v> 
values.

You can specify 3 coordinates, but the z values must all be the same. If 
not, the parser is supposed to issue an error because the polygon code 
won't work. However, it looks like that checking got dropped at some point.

I see this as a parser bug.

Bill P.

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