Thanks @L1z4rD89 But why are we doing it 4 times. Is it for up and down for 2 half spheres ? and when the (-1,0,0) vector rotated by vertical angle/2, does the (x,y,z) co-ordinates change ?
Thanks @L1z4rD89 But why are we doing it 4 times. Is it for up and down for 2 half spheres ? and when the (-1,0,0) vector rotated by vertical angle/2, does the (x,y,z) co-ordinates change ?