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Focal length in pixels = viewportHeight / (2 * tan(fov / 2)). The size attenuation formula basePointSize * focalLengthPixels / eyeDepth gives uniform on-screen size.
Focal length in pixels = viewportHeight / (2 * tan(fov / 2)). The size attenuation formula basePointSize * focalLengthPixels / eyeDepth gives uniform on-screen size.