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An Efficient Alias-free Shadow Algorithm for Opaque and Transparent Objects using per-triangle Shadow Volumes
 

Summary: An Efficient Alias-free Shadow Algorithm for Opaque and Transparent Objects
using per-triangle Shadow Volumes
Erik Sintorn
Chalmers University Of Technology
Ola Olsson
Chalmers University Of Technology
Ulf Assarsson
Chalmers University Of Technology
(a) (b) (c)
Figure 1: Images rendered with the novel shadow algorithm. All images rendered in 1024x1024, time taken to generate shadow buffers
in parenthesis. (a) Pixel accurate hard shadows in a game scene (7.29ms, 60k triangles). (b) Alpha-textured shadow casters (13ms, 35k
triangles). (c) Colored transparent shadows. Image rendered using depth peeling of 8 layers (75.66ms, 5-19 ms per layer, 60k triangles).
Abstract
This paper presents a novel method for generating pixel-accurate
shadows from point light-sources in real-time. The new method is
able to quickly cull pixels that are not in shadow and to trivially ac-
cept large chunks of pixels thanks mainly to using the whole trian-
gle shadow volume as a primitive, instead of rendering the shadow
quads independently as in the classic Shadow-Volume algorithm.
Our CUDA implementation outperforms z-fail consistently and sur-

  

Source: Assarsson, Ulf - Department of Computer Engineering, Chalmers University of Technology

 

Collections: Computer Technologies and Information Sciences