BRL-CAD , originally by Mike Muuss , is a powerful cross-platform open-source CAD/solid-modeling system that featues interactive geometry editing, high-performance ray-tracing for rendering and geometric analysis, image and signal-processing tools, a system performance analysis benchmark suite, libraries for robust geometric representation, with more than 20 years of active development.


Recent improvements to the Aqua Tk subsystem have made it possible for the first time to get reasonably-operational BRL-CAD running on OS X without the use of X. 1
BRL-CAD selected as a participant in Google Code-In 2013


To provide for the construction of realistic models of complex objects from a ralttively small set of "primitive shapes", BRL-CAD employs the basic Boolean operations of union, subtraction, and intersection, and assigns reals-world material attributes.

The Multi-Device Geometry Editor, comprised of over 100K lines of application logic in Tcl/Tk/Itcl/Itk/Iwidgets, is the heart of BRL-CAD, and its GUI is the primary user interface to the system. It calls into Tcl from C for nearly all tasks, including event handling, logging, I/O, and other operations. Both the large red window and the smaller rendering window have graphics contexts implemented via Tk C API, with the larger one providing a custom interactive 3D environment using Tk Pixmap and the smaller displaying an asynchronous incrementally rendered (ray traced) 2D image using Tk_PhotoImageBlock. There’s also dozens of complex/custom dialogs, windows, and other elements not shown. 1 .


Since 1979, the U.S. Army Research Laboratory has been developing and distributing the BRL-CAD constructive solid geometry (CSG) modeling package for a wide range of military and industrial applications. The package includes a large collection of tools and utilities including an interactive geometry editor, raytracing and generic framebuffer libraries, a network-distributed image-processing and saignal-processing capability, and an embedded scripting language.


MACTCL: Aqua MGED on Mac OS X , Christopher Sean Morrison, 2015-06-19