Models of light reflection for computer synthesized pictures
SIGGRAPH '77 Proceedings of the 4th annual conference on Computer graphics and interactive techniques
Proceedings of the Eurographics Workshop on Rendering Techniques 2000
SIGGRAPH '84 Proceedings of the 11th annual conference on Computer graphics and interactive techniques
Real-time relief mapping on arbitrary polygonal surfaces
Proceedings of the 2005 symposium on Interactive 3D graphics and games
Practical parallax occlusion mapping with approximate soft shadows for detailed surface rendering
ACM SIGGRAPH 2006 Courses
Proceedings of the 2007 symposium on Interactive 3D graphics and games
Efficient self-shadowed radiosity normal mapping
ACM SIGGRAPH 2007 courses
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For effectively rendering surface details, many texture-based methods such as normal mapping and displacement mapping were used to model detailed structures on a surface. Although self-shadow can be achieved by those techniques, most of them support hard shadow or ad-hoc approximation of soft-shadow for the self-shadow effects. In this paper, we present a simple method to render soft shadow casted by area lights on displacement mapped surfaces in real-time rendering applications such as 3D game engines. Our method first computes a visibility cone map, which stores the average visible ratio of each texel toward a certain direction. Then, during the rendering, the intensity of each pixel on the texture mapped surfaces can be calculated from the overlap between the projected lighting area and the projected visible cone.