Change FOV

FOV is read-only in VR because changing it would cause discomfort. How were you doing the culling? You should be able to add a collider and renderer for the helmet that will properly occlude the non-visible content.

"vrdaveb" wrote:
FOV is read-only in VR because changing it would cause discomfort. How were you doing the culling? You should be able to add a collider and renderer for the helmet that will properly occlude the non-visible content.

I was basically setting the FOV to 70 OnPreCull and then put it back to normal on OnPreRender. I never noticed anything anything bad in the rendering, appart from not having to render those elements when off the bounds of the helmet, obviously.

No low-level way of doing this?

Even if you leave the FOV alone, Unity's occlusion culling should be eliminating the invisible objects. Is that not the case? Are you seeing more draw calls in 5.3 compared to 5.1?

Thanks for your help vrdaved

After closer investigation I realized a very simple mistake: the 5.1 fov optimization was done and tested in a laptop that never had the Oculus rift plugged, as soon as I do it my FOV changer does not work even in that old version.

Which is a pity because it does help reduce a lot the triangles without needing to do the overhead of occlusion culling. :(
So, no chances to get that working I assume, looks like something deep inside the unity side.

Sorry, this is the first time we've received a request for that feature. I'll see what we can do about it. In the meantime, you could potentially cull the invisible content in other ways. Have you tried something like this? http://answers.unity3d.com/questions/33 ... plane.html

thanks! I will give it a shot.

Yeah my case it's quite specific I guess so I imagine it's normal this is the first request. I will try to find my way around it for now I imagine!

Edit: I have found this http://forum.unity3d.com/threads/vr-fie ... ew.358816/ fix seems to be on its way?

From that Unity post: http://forum.unity3d.com/threads/vr-fie ... ew.358816/

If I change the variable fieldOfView on precull it does change but only in the left eye (camera set to both). I guess this is an easy fix by separating the cameras... but somehow they get disabled?

Edit: I commented the code that disabled them... surprisingly enought this code

    private Camera reducedCamera;
    [Range (1,179)]
    public float cullingFov = 40.0f;
    private float renderingFov = 106;
    private Rect renderingRect;

    void Awake()
    {
        reducedCamera = this.GetComponent<Camera>();

        renderingFov = reducedCamera.fieldOfView;

    }

	void OnPreCull()
    {
        reducedCamera.fieldOfView = cullingFov;
    }


    void OnPreRender()
    {
        reducedCamera.fieldOfView = 106.188f;
    }

Does 2 thing wrong: first the OnPReRender section does not seem to be working (Testing using the DK2) because the rendering still looks like 40 FOV

Second reducing the FOV using this is actually increasing the number of triangles!?! Definetely weird!