FOV computation difference between hydra and the procedural

[cpichard]

Describe the bug
Some of the tests give very slight render difference between hydra and the procedural, this is due to the way the fov is computed. The test_1306 exhibits the issue and shows a small difference between the hydra deep exr render and its procedural counterpart.
We want to find a way to always get the same fov in hydra and the procedural.

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-15431