"Capitalism is an art form, an Apollonian fabrication to rival nature. It is hypocritical for feminists and intellectuals to enjoy the pleasures and conveniences of capitalism while sneering at it. Everyone born into capitalism has incurred a debt to it. Give Caesar his due."
- Camille Paglia

Framework 3 (Last updated: June 26, 2012)
Framework 2 (Last updated: October 8, 2006)
Framework (Last updated: October 8, 2006)
Libraries (Last updated: September 16, 2004)
Really old framework (Last updated: September 16, 2004)
Volume decals
Sunday, October 4, 2009 | Permalink

Source code
VolumeDecals.zip (1.2 MB)

Direct3D 10
This demo illustrates a fairly simple technique for creating seamless decals on arbitrary geometry. This is done by rendering a convex volume (such as a sphere or a box) around the decal area. Using the screen position and the information in the depth buffer the local position within the decal volume is computed. This is then used as a texture coordinate into a volume texture containing the decal. To get unique looking decals a random rotation is applied on each individual decal volume.
The decal pass is rendered at the end of the g-buffer pass in a deferred renderer and simply alters the diffuse and specular intensity parts while leaving the normals unchanged. The lighting can then be done as usual.

This demo should run on Radeon HD 2000 series and up, as well as GeForce 8000 series and up.