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G3D is a commercial-grade C++ 3D engine. It is used in commercial games, research papers, military simulators, and university courses. G3D supports real-time rendering, off-line rendering like ray tracing, and general purpose computation on GPUs.
As of January 16, 2018, SourceForge is again the home of the active repository for G3D.
...If you're looking for the best 3d modeler or best ray tracer, this isn't it. If you want to easily make some simple 3D primitives and see multiple reflections or dink with ray trace code, you might find this fun, read on.
In 2nd grade we had a sub who taught us to draw 2pt perspective - life was never the same. My dad's drafting book taught that and 3pt persp. In art I was awed by Durer and the mirror in Van Eyke's Wedding. In the 70s-80s I was trying to do 3D on early computers - big BW pixels! By late 80s I saw ray tracing and had to write my own.
I wrote the 1st ver while taking vector calculus and CAD programming classes c. '92. ...
This project is not currently being supported but feel free to use it as an example.
delta3d is a robust simulation platform built using open standards and open source software. It features full toolchain development supporting a wide variety of free and commercial software.