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Z Buffer Algorithm
ques10.com(Z-Buffer) Depth Buffer Method:- One of the simplest and commonly used image space approach to eliminate hidden surfaces is the Z-buffer or depth buffer algorithm. It is developed by Catmull. This algorithm compares surface depths at each pixel position on the projection plane. The surface depth is measured from the view plane along the z-axis of a viewing system. When object description is converted to projection co-ordinates (x, y, z), each pixel position on the view plane is specified by x and y coordinate, and z-value gives the depth information. Thus object depths can be compared by comparing the z- values. The Z-buffer algorithm is usually implemented in the normalized coordinates, so that z-values range from 0 at the back clipping plane to 1 at the front clipping plane. The implementation requites another buffer memory called Z-buffer along with the frame buffer memory required for raster display devices. A Z-buffer is used to store depth values for each (x, y) positio...