Rendering antialiased shadows with depth maps
SIGGRAPH '87 Proceedings of the 14th annual conference on Computer graphics and interactive techniques
Proceedings of the 29th annual conference on Computer graphics and interactive techniques
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Adaptive depth bias for shadow maps
Proceedings of the 18th meeting of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games
Proceedings of the 18th meeting of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games
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Traditional shadow maps [Williams 1978] suffer from two main issues, aliasing errors and depth bias problems. We present a novel algorithm, the reconstructable geometry shadow maps (RGSM), as a solution to both problems. It is capable of producing sub-pixel depth accuracy in the camera view and thus reduces two categories of aliasing errors, the perspective aliasing errors and the projective aliasing errors. This goal is achieved by using the depth values faithfully reconstructed from the corresponding occluding triangles instead of taking point samples from the depth map. The experimental result also shows RGSM requires a much smaller depth bias value than other shadow mapping techniques.