13. Perspective Projections p ( x,y,z ) z y Projection plane p s ( x s ,y s ) C d By similar triangles: p ( x,y,z ) z x Projection plane p s ( x s ,y s ) C d
23. Oblique Parallel Projections x y (x s ,y s ) (0,0,1) P Consider the point P: P can be represented in 3D space - (0,0,1) P can be represented in 2D (screen coords) - (x s ,y s )