Coordinate transformation of graphic technology

The conversion process

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Coordinate clipping is performed before perspective division , In clipping coordinates x, y, z Will work with w To test , stay [-w, w] The vertices outside the are clipped off

This w From where ：w By PROJECTION Matrix Homogeneous coordinates added after transformation , Its value is equal to that in camera coordinates -z  value ( The camera coordinates use the right-hand coordinate system ), And its scope must be [near, far] Between , Otherwise it will be cut off

Then perspective division and viewport transformation will be performed by GPU Automatic execution , And then it came in fragment shader

 

Coordinate data during conversion

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