Mario 64 modding tool for the masses:
http://sites.google.com/site/messiaen64/level-importerFeatures:
- Imports Wavefront .obj files as the level mesh of any level in the game
- Customize available objects
- Set environment effects (snow, lava, beta flower) and terrain settings (slide, snow, sand)
- Assign collision types to materials
- Customizable Fog settings
- Custom Background support
- Misc ROM adjustments: start level, star positions, trajectories (such as KTQ), plus more.
Coming soon in next release:
- Water/Toxic Haze support
- Better custom background support
- Custom Music insertion
Edit: Not an April 1st joke
, have been working on this for months.