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That's an old height-field problem that has been part of POV-Ray for years
(long before MegaPov entered the scene). It is caused (AFAIK) by
floating-point precision problems, where a ray "leaks" through the
height-field, causing the height-field intersection algorithm to get very
confused. A workaround is to move your camera a very small amount (just a
fraction of a unit in one direction should be sufficient).
-Nathan
"Patrick Dugan" <pat### [at] netins net> wrote...
> I can't be sure that the error is due to Megapov but that's what is
running
> when the error happens.
>
> The error is:
> Illegal grid value in dda_traversal().
>
> I am using radiosity and photon mapping.
>
> What am I doing that might be causing the error? The image still renders,
> but I feel I should try to resolve the error, however it gives no line
> number and the error seems cryptic to me. I don't get any other warnings
or
> errors.
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