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-
- Direct Illumination with Lazy Visibility Evaluation
- Supplemental material
- David Hart, Philip Dutre and Donald Greenberg
- Cornell University Program of Computer Graphics
-
- Please direct any questions or comments to:
- dahart@graphics.cornell.edu and/or phil@graphics.cornell.edu
-
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-
- siggraph.mpg
-
- This animation depicts the SIGGRAPH 99 title floating above a
- spherical floor, on which soft shadows can be seen. One light source
- is positioned in front of the letters, another behind. Two different
- shadows are visible: the diffuse shadow caused by the diffuse
- component of the BRDF, and the specular shadows caused by the glossy
- component. The viewer passes back and forth through the Phong-lobe of
- light reflected from the light source behind the letters. Although no
- indirect illumination component is computed, the geometry of where the
- reflection should occur is handled correctly and shows up as a
- specular shadow. The specular shadow is view dependent and has the
- appearance of a reflection in that it appears to be oriented
- vertically like the letters themselves, but unlike the diffuse shadows
- which appear to lay horizontally on the floor surface. This effect is
- very clear in particular underneath the letter 'A', where at one point
- two very distinct shadows, cast from a single light, are apparent (see
- image6.tif).
-
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- image*.tif
- blkmap*.tif
-
- These are some additional images rendered with analytic
- integration and their associated blocker-maps.
-
-