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K. Tyler wrote:
>
> I received an error mesage today from a scene I rendered conataining
> 1 height field with an image map for texture, and one backgroud plane.
>
> The message read: Illegal Grid Value in dda_traversal ( ).
>
> The scene seemed to render properly but the illegal message
> was repeated 14 times in the message window.
This is a well known bug from previous POV versions. I know of no
successful fixes as yet. It has to do with floating point accuracy and
height fields. Very roughly, sometimes you shoot a ray "between the
cracks" of a height field. Sometimes it has no visible effect,
sometimes you get small artifacts. Sometimes moving the camera,
look_at, or height field slightly will help. A DejaNews search on cgrr
will find several threads about this. Usually, it does little or no
harm.
Jerry Anning
cle### [at] dhol com
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