There is a question about Frustom as follows
Ex. There is a flat ground and the coordinate of its 4 corner are
(4, 0, 4),(-4, 0, 4),(4, 0, -4),(-4, 0, -4),
I want to use glFrustom and set the
near = 1, far = 4,
top = 2, bottom = -2
right= 2, left = -2
after matrix calculation, the 4 points becomes
(2,0,-28/3,-4) (-2,0,-28/3,-4)
(2,0,4,4) (-2,0,4,4)
after homogenizaion :
(-0.5, 0, 7/3, 1) (0.5, 0, 7/3, 1)
(0.5, 0, 1, 1) (-0.5, 0, 1, 1)
I don’t understand that can i use this 4 points to raster a correct ground?