Texture Mapping Based on Coefficient Map and Basic Texture Map

Texture mapping may give the impression of geometric details in a model using an image. But texture always was captured under special light condition. If the lighting in virtual environment is different from the texture image, the result of rendering will be incorrect and unrealistic. This paper proposes an image-based method that requires basic texture map and coefficient maps to interpolate light effective. This method uses a quadratic multinomial to fit the reflection model. The coefficients of quadratic multinomial will be gained from BTFs and are stored as coefficient maps. A picture is taken under wellproportioned environment light as a basic texture map, which the chromaticity is saved. The method can reconstruct the surface color under varying lighting conditions and represent the variation in surface color for each texel independently. Coefficient map and basic texture map make texture mapping become more realistic, simple and convenient.