LOD boundaries in VR (Rift+Vive) very different from non-VR

Target Platforms XR
1

Hi,

Just checking.
Got this large project of a neighborhood with 60+ houses. I’m using a simple 2-level LOD. The boundary setting however seems to be very dependent on the final rendering platform.
For non-VR in the editor my boundary between LOD0 and LOD1 is around 40%, but with VR enabled it need to be around 10% to achieve a similar effect!

Two questions:

  1. Is this normal behavior?
  2. If so, can I code for this difference in case no VR device is attached? Can I code for dynamically changing the LOD boundaries?

Cheers!

Marco

2

LOD boundaries in Unity are based on screen coverage percentage. This means LOD boundaries are effected by camera FOV, and the render FOV for many VR headsets is >90 degrees, where I think the default Unity camera is 60(?) with most modern first person games default usually in the 75~65 degree range.

To work around this the quality settings have an LOD bias setting you can play with. You can try setting it to 4.0 when you are in VR.

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