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zNear is not really related to field of view. FOV specifies the angle of the frustrum, while zNear describes the distance to the nearest clipping plane. As an example, here are two frustrums with the same FOV, but different near clipping planes. And here is another frustrum with the same zNear as the first, but different FOV. A good approach to ...


zNear and zFar are measured in world space, not in anything to do with pixels. Their scale will depend on the scale of the scene you're rendering and how close/far the camera will be to the geometry. For instance, if your scene is modeled in meters, you might set zNear to 0.1 and zFar to 1000 or so. This would let you get the camera as close as 10 cm from ...

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