From Rigs of Rods Wiki
important: read also: LevelOfDetail
If you create high poly meshes for RoR, make sure to take care about the Level of Detail(LOD) of the mesh.
Either generate the simpler LOD meshes upon export of your mesh with your 3d editor or use the Ogre Meshupgrade tool to generate the LODs for a mesh:
by using the command line:
OgreMeshUpgrade.exe -l 3 -d 256 -p 50 myMesh.mesh
- "-l 3" = 3 LOD levels
- "-d 256" = 256 meters between LOD levels
- "-p 50" = 50 percent of the mesh removed every level
If you ignore this, RoR will generate LODs for you which results in huge loading times.