Shadow Volume Artifacts
Author
hello people!
I have a problem with Shadow Volumes.
I use the z Fail Algorithm.
When I daw the shadow volume of one polygon everything is ok!
but if i draw the shadowvolume of a lot of polygon I get artifacts at the place that the two shadow volumes "contact".
why?
I think I can take a bash at the problem from his description.
Although in future a screenshot can help us to help you better.
You have 2 coplanar polygons and you''re doing depth testing on them - due to numerical inaccuracies in the zbuffer you''re probably getting what is called z-fighting.
Your solution is going to have to deal with that by grouping shadow volumes with coplanar polygons. Instead of extruding 2 shadows from 2 polygons, group the polygons (if they share an edge) and create a single volume.
Hope this helped,
FReY
Although in future a screenshot can help us to help you better.
You have 2 coplanar polygons and you''re doing depth testing on them - due to numerical inaccuracies in the zbuffer you''re probably getting what is called z-fighting.
Your solution is going to have to deal with that by grouping shadow volumes with coplanar polygons. Instead of extruding 2 shadows from 2 polygons, group the polygons (if they share an edge) and create a single volume.
Hope this helped,
FReY
Author
FReY: You understood the problem.
THis is exectly the problem I have. I will try to groop shadows into one.
If I upload any screenshots i will put them here. But you told me the solution.
Thanks Guys!
THis is exectly the problem I have. I will try to groop shadows into one.
If I upload any screenshots i will put them here. But you told me the solution.
Thanks Guys!
This topic is closed to new replies.
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