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Was just about going suggest the same thing. JPCT has a software and hardware render. I found it was easy to learn, and the engine is fairly light.
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There are a few examples included with the download. There are also extra examples on the downloads page.
Any extra help you just search the forums or post questions.
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hum 3DzzD is free ??? it may have not be when it was bringed out a cupple of years ago but nowadays it is completly free to use, and source code opensouring has been annouced in the forum for december.