I'm finding the best results by uploading a 3DS and "ziping" that together with my materials.
For those that would like to compare similar models to O2C here's a file I'll deposited a few into on Dropbox. Both viewers have their advantages and with the addition of O2C for the IPAD that is a real plus.
https://www.dropbox.com/sh/3in9ymflxjrclmc/xciRofXXq9Good viewers will be huge for my business especially a viewer that the end users doesn't have so fuss with. Nice to see some progress down that road.
Bob