A number of years ago, Joshua and I collaborated on LDView's support for his proposed OBI LDraw extension. However, to the best of my knowledge, it was never proposed to the standards committee, and LDView disables support for it by default. If you want to use it, you need to set LDView's OBI hidden setting to TRUE (either by -OBI=1 on the command line, or via the registry; see LDView's help file for general information about setting settings). And in order to actually see any OBI rendering, you of course need OBI-supporting parts and primitives (which Joshua created for his personal use, but as far as I know haven't been published anywhere).
I'd give you more details, but the while the OBI syntax was designed (by Joshua) to be as simple as possible, it still isn't trivial, and I don't remember it off-hand. I could in theory reverse engineer it by looking at LDView's source code, but it would take a lot of effort, and I'd probably miss something anyway.
I'd give you more details, but the while the OBI syntax was designed (by Joshua) to be as simple as possible, it still isn't trivial, and I don't remember it off-hand. I could in theory reverse engineer it by looking at LDView's source code, but it would take a lot of effort, and I'd probably miss something anyway.