Hi Beni, sorry for the late reply. I wonder if you solve the problem. Basically many of this sort of issues are expected because some features of 3d models are currently not supported in BuildAR. We would be fixing this by updating our software to interpret the latest versions of FBX and Collada file formats. FBX and Collada are becoming the defacto-standards for graphics exchange between applications, and once we make this upgrade our support for this kind of features will be improved.
If you have an asset that you couldn't import into BuildAR, perhaps we could run a few tests here to see if it will work on our new version, or if somebody in the lab knows a workaround.
Hope the project goes well,
- Gabriel