NASCAR 25

[spiritovod]

I noticed that most car parts are actually stored in IRM (iRacing meshes), which is probably ported from their previous game format. From brief search I couldn't find any tools for it and added basic support for it to specific build - no special override is required, simply choose proper engine version.

Known issues: Materials are not linked, because they're not explicitly referenced in such meshes. Weights are not processed if present (some meshes are skinned), maybe it's worth to export them with some dummy skeleton. There is certain geometry overlapping/duplication, not sure it's a error or some additional layers for post-processing.

Also note that lods for such meshes are not lods, but different submeshes (can be switched with "L" button). They're processed like that due to format and umodel specifics.