Rendering antialiased shadows with depth maps
SIGGRAPH '87 Proceedings of the 14th annual conference on Computer graphics and interactive techniques
Hierarchical Z-buffer visibility
SIGGRAPH '93 Proceedings of the 20th annual conference on Computer graphics and interactive techniques
A fast shadow algorithm for area light sources using backprojection
SIGGRAPH '94 Proceedings of the 21st annual conference on Computer graphics and interactive techniques
Efficient image-based methods for rendering soft shadows
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
Shadow algorithms for computer graphics
SIGGRAPH '77 Proceedings of the 4th annual conference on Computer graphics and interactive techniques
Approximate soft shadows on arbitrary surfaces using penumbra wedges
EGRW '02 Proceedings of the 13th Eurographics workshop on Rendering
IEEE Computer Graphics and Applications
Casting curved shadows on curved surfaces
SIGGRAPH '78 Proceedings of the 5th annual conference on Computer graphics and interactive techniques
SIGGRAPH '84 Proceedings of the 11th annual conference on Computer graphics and interactive techniques
Soft shadow volumes for ray tracing
ACM SIGGRAPH 2005 Papers
Multi-level ray tracing algorithm
ACM SIGGRAPH 2005 Papers
Soft shadows from extended light sources with penumbra deep shadow maps
GI '05 Proceedings of Graphics Interface 2005
Shadow penumbras for complex objects by depth-dependent filtering of multi-layer depth images
EGWR'99 Proceedings of the 10th Eurographics conference on Rendering
Real-time soft shadow mapping by backprojection
EGSR'06 Proceedings of the 17th Eurographics conference on Rendering Techniques
ACM SIGGRAPH ASIA 2009 Courses
Sample based visibility for soft shadows using alias-free shadow maps
EGSR'08 Proceedings of the Nineteenth Eurographics conference on Rendering
Adaptive volumetric shadow maps
EGSR'10 Proceedings of the 21st Eurographics conference on Rendering
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We present a method for high quality soft shadows for area lights in cinematic lighting. The method is an extension of traditional shadow maps, so it has the advantage of image based shadow methods; the algorithm's complexity is independent of geometric complexity. We introduce multilayer transparent shadow maps, which can be used to produce high quality soft shadows for scenes with extremely complex geometry, fur, and volume objects. Instead of the traditional sampling and filtering of shadow maps, we compute the shadow factor by ray tracing the multilayer transparent shadow map. The result is soft shadows of quality similar to that achieved by stochastic ray tracing, but at a much lower cost.