图形学3D数学基础 图形与游戏开发习题答案.pdf

Answers Chapter 2 1) Give the coordinates of the following points: a (-2.5, 3) b (1, 2) c (2.5, 2) d (-1, 1) e (0, 0) f (2, -0.5) g (-0.5, -1.5) h (0, -2) j (-3, -2) 1 2) List the 48 different possible ways that the 3D axes may be assigned to the directions “north,” “east” and “up.” Identify which of these combinations are left-handed, and which are right-handed. North East Up Hand North East Up Hand +x +y +z Left +x +z +y Right +x +y –z Right +x +z –y Left +x –y +z Right +x –z +y Left +x –y –z Left +x –z –y Right –x +y +z Right –x +z +y Left –x +y –z Left –x +z –y Right –x –y +z Left –x –z