I think I've wrote this 100 times.... It is not up to NL to write a plugin.... Revit has not such powerful API for this... It is just some commands for object handling....
But even if you had a simple Revit to MXS conversion, you would have to use Studio for everything because Revit lacks features like import of 3ds and obj or similar formats... What will you use for trees, RPCs or just planes that you won't even be able to make them look at the camera? What about furniture... Revit has the ugliest 3d library I've seen... No evermotion or even free models from the internet for Revit users...
No motion blur, no sub-object handling, no mesh subdivision, no smoothing, no animation... and many others... Actually now that I think of it, it would be better to use Maxwell with ACAD!!!

- By Jochen Haug