better and tighter options for clipping range
The old automatic clipping range code always grew the bounds to be double the required bounds. With the zbuffer being so heavily nonlinear this was not a good for many situations. This topic alows you to control the bounds expansion to it can be much tighter which if you are calling ResetCameraClippiNgRange every time the camera changes it should be set to 0.0 not the default of 0.5.
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