Beta
The camera.
The top fov angle in radians.
In symmetric projections, the principal point coincides with the image center, and the vertical and horizontal FOVs are each split at that point in two equal halves. However, in asymmetric projections the principal point is not at the image center, and thus each fov is split unevenly in two parts:
Symmetric projection Asymmetric projection
| ^ | | ^ | | | | | |tFov | | |tFov | | lFov v rFov | | | | |<----->x<-------------->| | lFov v rFov | | ppal ^ point | |<--------->x<--------->| | | o | | ppal point=img center | | | img center | | ^ | | | | | |bFov | | |bFov | | | | | | | | v | | v |
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Returns top fov angle for a given perspective camera.