META2TR is freeware. It extracts 3D files from TR4 levels, which can be enhanced in Metasequoia or other 3D software, then re-imported back into the TR4 level. It is compatible with TRLE, TREP and NGLE.
Update: I am closing my site because it's out of date and I don't have time to maintain it. If you need help, please take a look at the demo level download below or check out the forums here. I am also removing links to older versions to avoid confusion.
Here are the latest versions of everything:
meta2tr_v8a.zip
meta2tr_v8.zip
floor2prj_v3a.zip
Demo levels:
meta2tr_v7e_+_demo_levels.zip
Includes all the files (project, wad, Metasequoia files). The level has pop-up text and a guide showing how key features were built.
Happy editing