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"When I render a height field I get lots of warning messages saying "Illegal grid value in dda_traversal()". How can I correct that?"
(Answer by Jerry Anning)
Basically, you have a ray going "between the cracks" of the height field due to an arithmetic accuracy problem. Sometimes it does no harm. Sometime you get black dot or line artifacts. I know of no successful patch so far. I also know no completely reliable workaround. The best bet is to slightly joggle the camera position and/or angle.
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