Fabien Mosen wrote:
> Maybe it's time to fix an inconsistency between primitives.
> Here's how RC1 acts with zero-dimension volumes :
> 
> box {<10,10,10>,<10,10,10>}
>   Rendering goes without a warning.

OK, I think.

> cylinder {<10,10,10>,<10,10,10>,1}
>   Parsing stops with an error.

The disc-cylinder can't be calculated, because the normal isn't known.

> cone {<10,10,10>,1,<10,10,10>,2}
>   Parsing stops with an error.

Same.

> triangle {<10,10,10>,<10,10,10>,<10,10,10>}
>   Rendering goes, but a warning is issued.

Doesn't behave like box does.

> plane {0,0}
>    Parsing stops with an error.

Again the normal is unknown.

> torus {0 0}
>   Rendering goes without a warning.

Same as box.

> sphere {0,0}
>    Rendering goes without a warning.

Same as box.

> Of course, these are very specific cases, but they can easily
> happen in scenes with automatic object generation.  IMO, the
> best thing that POV-Ray should do is render anyway, with a
> warning, as it currently does with 'degenerate' triangles.

The only inconsistency I see is the warning at the triangle. All 
objects which generate an error can't be calculated due to the missing 
normal.

Felix Wiemann

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