| 摘要 |
PROBLEM TO BE SOLVED: To obtain a device capable of exactly and speedily processing a perspective projection correction for every plane while preventing the increase of the number of times of division by providing specified surface pitch element coefficient calculation part and an interpolation coefficient calculation part. SOLUTION: A surface pitch element calculation part 2310 calculates the coefficient meaning the surface pitch of the triangle defined in the three-dimensional space which is commonly usable for plural geometrical parameters to be interpolation objects. An interpolation coefficient calculation part 2320 calculates an interpolation coefficient from the surface pitch element coefficient obtained by the surface pitch element coefficient calculation part 2310. A correction part 2520 performs an exact perspective projection correction by using the interpolation coefficient obtained in the interpolation coefficient calculation part 2320. In this constitution, the surface pitch element coefficient in the threedimensional space which is commonly usable for plural geometrical parameters required when a shading is imparted is adopted, the number of times of division is reduced, the plural geometrical parameters required for the shading of a graphic are interpolated for every surface in the three-dimensional space, after the perspective projection. |
