Hi Yoz, i dont know if i can help you, why dont try a free engine.
I scanned an Urban area (aprox 2500 pix) minimum 150x150m, simpliyed to 4M, exportet wit 11 8K textures,
and loaded in Steam/Destinations. Walking around the Urban area with my HTC Vive VR Headset at smooth 90fps.
Or export to Sketchfab direct from RC ?