HELP: Depth map shadows are really grainy if you scale up

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I m using a spotlight with depthmap shadows(512,512 not transparent) pointing to a plane. If i scale the scene up 100times i get a really bad grain. If the scene is 1 unit i get a really clean image. Is this a bug or what?I ve never seen any 3d program where the depth shadow map quality depends by the scale of the scene. I also set the clipping for the shadow maps to the minimum range necessary to get a better quality map, but it didn t solve the problem at all.
I hope anyone could help…

Thanks
Sergio

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grain.hip (157.9 KB)

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it seems that shadow bias has affect on this
just scale it up by the same factor
Tomas Slancik
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Method Studios, NY
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Shadow bias is in scene units so if you have a huge scene, you need to compensate accordingly.

It's a part of the game when dealing with depth map shadows and the limited precision available.
There's at least one school like the old school!
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Thanks a lot…the explanation helped me.

Cheers
Sergio
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Thanks a lot…the explanation helped me.

Cheers
Sergio
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