RASTERIZING METHOD

摘要

A rasterizing method calculates an attribute (C) of a pixel having coordinates (X, Y) based on the coordinates (X0, Y0), (X1, Y1), (X2, Y2) of vertices of a primitive in a screen space, Z coordinates Z0, Z1 and Z2 of said vertices into the three-dimensional space, and attributes C0, C1, C2 of said vertices. The method defines a vertex (X0, Y0) as reference, the attribute (C) with the formula: $C=\frac{\begin{array}{c}\left(\mathrm{Delta}X_{20}\mathrm{Delta}Y_{10}-\mathrm{Delta}Y_{20}\mathrm{Delta}X_{10}\right)Z_1Z_2C_0+\\ \left(\mathrm{Delta}y\mathrm{Delta}X_{20}-\mathrm{Delta}x\mathrm{Delta}Y_{20}\right)\left(Z_0Z_2C_1-Z_1Z_2C_0\right)+\\ \left(\mathrm{Delta}x\mathrm{Delta}Y_{10}-\mathrm{Delta}y\mathrm{Delta}X_{10}\right)\left(Z_0Z_1C_2-Z_1Z_2C_0\right)\end{array}}{\begin{array}{c}\left(\mathrm{Delta}X_{20}\mathrm{Delta}Y_{10}-\mathrm{Delta}Y_{20}\mathrm{Delta}X_{10}\right)Z_1Z_2+\\ \left(\mathrm{Delta}y\mathrm{Delta}X_{20}-\mathrm{Delta}x\mathrm{Delta}Y_{20}\right)\left(Z_0Z_2-Z_1Z_2\right)+\\ \left(\mathrm{Delta}x\mathrm{Delta}Y_{10}-\mathrm{Delta}y\mathrm{Delta}X_{10}\right)\left(Z_0Z_1-Z_1Z_2\right).\end{array}}$