Does number of lod levels matter (for Vr project)

Hello,

  • Does having Too much LODs effect the performance ( lets say I want to make a forest that is 1km x 1km big) ?

  • if so which part of the hardware does it affect ? ( I mean for example: having more LOD effects the CPU and the Files sizes of your PC and ect.).

Im messing around with VR and optimasation in ue4 (for testing purposes). So,
I made a Photoscanned rock . its size is roughly 4-6 cubic meters. I Made couple of test and the sweet spot was 23 k tris 12k verts for LOD0. 23k tris is still too much for VR (I guess).On the other hand, since you can litterally smash your head to the rock in VR. Less then 23k at LOD0 becomes very unrealistic.

So I thought only if im very close to the mesh it could trigger LOD0 and adding more LOD levels rather than having very low LOD0 could fix my issue.

I tried 80% for LOD1 at (0.95 screenspace), 60% LOD2, 40% LOD3, 10% LOD4.