Materials%20for%20Rendering

Materials%20for%20Rendering - Realistic Materials for...

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Unformatted text preview: Realistic Materials for Rendering Sumanta Pattanaik Realistic Rendering Geometry Light and its Transport Materials Renderer Synthetic Camera Image Realistic Rendering: Example "Efficient Acquisition and Realistic Rendering of Car Paint" by Gnther, Chen, Goesele, Wald and Seidel in Proc. VMV 2005 Realistic Rendering Geometry Light Source Materials Renderer Synthetic Camera Image Material: Optics taught in school Material: Optics taught in school Material: Optics taught in school for some dielectrics Vacuum 1.0 Air at sea level 1.00029 Ice 1.31 Water (20 C) 1.333 Fused Quartz 1.46 Glass 1.5-1.6 Sapphire 1.77 Diamond 2.42 Material: Optics taught in school reflectance for glass at 550 nanometers For dielectric, or non-conducting, materials, the effect is very strong: most glasses and plastics have refractive indices around 1.5, giving a reflectance of only 4% at normal incidence, but 100% at grazing. It's also why it's hard to comb your hair in a shop window; you are looking at the angle of minimum reflectance. Fresnel Reflection ( 29 ( 29 ( 29 ( 29 i i i i i i i i ll k k r k k r 2 2 2 2 2 2 2 2 2 2 2 2 2 2 cos cos 2 cos cos 2 1 cos 2 cos 1 cos 2 cos (Metals) : Conductors For + + + +- + = + + + +- + = ( 29 ( 29 r t ll r F F r r F- = + = 1 , 2 1 2 2 Conductors do not transmit, but some of the incident light is absorbed. and for some conductor Gold 0.37( ) 2.82( k ) Silver 0.177 3.638 Copper 0.617 2.63 Steel 2.485 3.433 Typical Reflectance of Metals reflectance for pure aluminum at 550 nanometers For metals the effect of Fresnel reflectance is subtle; for aluminum, reflectance remains above 86% for all angles. Material Property of Conductors Approx method (Cook-Torrance,82): Assume reflectance at normal incidence of light and viewer. Assume to be zero and compute . Solve for : From measured normal incidence ( 29 ( 29 2 2 2 2 2 2 1 1 1 2 1 2 || +- = + + +- = = r r - + = 1 1 Material Property of Conductors Approx Method: (continued) Assume to be zero and compute . Solve for : From measured normal incidence 4 2 2 2 2 || + = = r r - = 1 2 BRDF for Optically smooth material Reflected Radiance computation is simple. ( 29 ( 29 ( 29 in out out d L d d L = BRDF for Optically smooth material Transmitted Radiance: ( 29 ( 29 ( 29 2 1 2 2 in out out d L d d L = ( 29 ( 29 in out d d - = 1 Material: Optics taught in school Mirror, Smooth Metal, Smooth plastic Material: Real world Surface Roughness Material: Real world Surface Roughness Material: Real world Reflection for a smooth Aluminium foil vs crumpled Aluminium foil Material: Real world Material: Real World Material: Real World Surface roughness and subsurface transport leads to spectral, directional, and spatial varation....
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This note was uploaded on 08/22/2010 for the course CAP 6701 taught by Professor Staff during the Spring '10 term at University of Central Florida.

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Materials%20for%20Rendering - Realistic Materials for...

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