IEEE Computer Graphics and Applications
High quality rendering using the Talisman architecture
HWWS '97 Proceedings of the ACM SIGGRAPH/EUROGRAPHICS workshop on Graphics hardware
Feline: fast elliptical lines for anisotropic texture mapping
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
Texture potential MIP mapping, a new high-quality texture antialiasing algorithm
ACM Transactions on Graphics (TOG)
Constant-time filtering with space-variant kernels
SIGGRAPH '88 Proceedings of the 15th annual conference on Computer graphics and interactive techniques
Texram: A Smart Memory for Texturing
IEEE Computer Graphics and Applications
SIGGRAPH '83 Proceedings of the 10th annual conference on Computer graphics and interactive techniques
Summed-area tables for texture mapping
SIGGRAPH '84 Proceedings of the 11th annual conference on Computer graphics and interactive techniques
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MIP mapping is a common method used by graphics hardware to avoid texture aliasing. In many situations, MIP mapping over-blurs in one direction to prevent aliasing in another. Anisotropic texturing reduces this blurring by allowing differing degrees of filtering in different directions, but is not as common in hardware due to the implementation complexity of current techniques. We present a new algorithm that enables anisotropic texturing on any current MIP map graphics hardware supporting MIP level biasing, available in OpenGL 1.2 or through the GL_EXT_texture_lod_bias or GL_SGIX_texture_lod_bias OpenGL extensions. The new algorithm computes anisotropic filter footprint parameters per vertex. It constructs the anisotropic filter out of several MIP map texturing passes or multi-texture lookups. Each lookup uses MIP level bias and perturbed texture coordinates to place one probe used to construct the more complex filter profile.