cam: extend frustum's far distance helper #71
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* this will help to implement zoom easily
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A helper to extend far plane of view frustum (perspective projection). This will help to implement zoom easily by moving camera and extending frustum.
New function:
it extracts near and far distances and makes new far distance
far = far + deltaFar.This function is used to implement camera zoom in Graphics Kernel (https://github.com/recp/gk)