Vegas burns 3D Blu-ray according to profile 5 of the blu-ray consortia - in a BDMV-structure. And this is a "true" 3D Blu-ray.
To do so, Vegas but als Vegas Moviestudio has an MVC-encoder integrated in the Sony AVC-encoder.
The way to do so is to burn a 3D Blu-ray from the timeline. The project-settings has to be a 3D project. Then the choice is what is in line with the blu-ray consortia - 720 50p, 720 60p and 1080 24p.
One can set markers to create capital markes on the disc - but that is it. No menus. The DVDA does not support 3D at all.