【OpenGL】正交投影和透视投影矩阵（一）—— openGL投影函数对应矩阵

正交投影

void glOrtho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble zNear, GLdouble zFar);

void gluOrtho2D(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top);

透视投影

void glFrustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble zNear, GLdouble zFar);

void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar);