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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