| 21 2D texture mapping: real-time perceptual surface roughening (2008) | |||||||||||||||||
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| Figure 1: Cylinders with an orthogonally-projected plaster texture. In the first cylinder the texture is only warped, while in the second we have added diffuse shading as is conventionally done for texture-mapped Lambertian surfaces. In the third, the blackshot was modified, and in the last one the luminance values were remapped according to the texture-contrast function (2 1 D texture mapping) presented in this paper. 2 Out of the four approaches, ours gives the best sense of surface relief. We applied fundamental perceptual and physico-mathematical studies to a fast method for luminance remapping of 2D texture maps which enhances perceived surface roughness in comparison with conventional 2D texture mapping. The fundamental physical mechanism underlying the method is the fact that texture contrast increases as the incident illumination tends towards grazing for rough matte surfaces, actually “exploding ” near the shadow edge [Pont and Koenderink 2005]. A psychophysical study by Ho | |||||||||||||||||
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