Doomsday Engine

skyjake wrote:

The correct FOV angle is a crucial part of Oculus Rift rendering:

• Create a mechanism for maintaining or restoring the non-Rift-mode field of view setting

I implemented the FOV CVAR mechanics in revision https://github.com/cmbruns/Doomsday-Engine/commit/164ad04bb7b732f1c2905343bee37d02bfc61c83

• Provide a CVAR for whether or not to automatically load parameters from the Rift SDK

rend-vr-autoload-rift-params, defaults to true.

• Settle on sensible default values for interpupillary distance and Rift-FOV

Defaults to 0.0622 (my personal IPD) and 114.8 degrees (my Rift device geometry)

• Reading and storing the parameters from the Rift SDK

I implemented load/store from Rift SDK in https://github.com/cmbruns/Doomsday-Engine/commit/7bfd9dd3efc0cb5d27be1f15c4ff95699bd10519

• Renderer Settings: Disable manual FOV adjustment in Rift mode

Because a current correct value of rend-camera-fov is always required, to get correct clipping, I chose instead to have rend-camera-fov mirror rend-vr-rift-fovx while in Rift mode, and to mirror rend-vr-nonrift-fov in other modes. During mode changes, rend-camera-fov is updated from either rend-vr-rift-fov, or from rend-vr-nonrift-fov. This way, rend-camera-fov is always current and accurate; can always be adjusted, if needed; and always remembers the non-rift value.