BRL-CAD

Cross-platform, open-source combinatorial solid modeling CAD system with a ray-tracing engine.

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BRL-CAD is a free, open-source combinatorial solid modeling CAD system with an interactive 3D geometry editor and a high-performance, network-distributed ray-tracer for rendering and geometric analysis. It also includes image/signal-processing tools and a scripting interface. Actively developed since 1979, it has been applied to vehicle and mechanical design, architecture, and radiation dose planning, and suits engineers who need solid modeling plus rigorous geometric analysis.

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