Explain Depth buffer method ?

Depth Buffer Method

• To compare the surface depths at each pixel position on the plane projection
• Also referred as z- buffer method
• Two buffer areas
• Depth buffer to store depth values
• Refresh buffer to store intensity values
• Depth value for a surface position (x, y)
               Z( -Ax – By – D)/C
• Depth z’ of next position (x + 1, y)
              Z’( -A(x + 1)-By – D)/C