Mathias Agopian acb2da7759 Improvements to Camera APIs (#3701) ...

* move the focus distance from DofOptions to Camera

The DofOption parameter is now deprecated, but will still work if the
focus distance is not set on Camera.

* A few new helper APIs on Camera

- getFocalLength() which returns the focal length used internally for
  DoF computations.

- computeEffectiveFov() and computeEffectiveFocalLength() which can be
used to better simulate a real camera's FOV changes with the
focus distance.

Modified gltf_viewer so it uses the effective fov/focallendth when
DoF is active.

* simplify setLensProjection

We can call setProjection directly instead of converting to a fov
first, which ends up performing atan(tan(x)).

Also improve parameters names.

2021-03-25 15:22:19 -07:00

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