If anyone is looking for a parametric CAD optimization rabbit hole to go down, please geek on on SolveSpace! I'm sure others would appreciate it. I love using it for quick engineering project mockups. It's really too bad, because putting something like that together is otherwise super fast and easy in SolveSpace. It quickly degenerated into half-hour redraws and I gave up finishing the assembly. I modeled the channel details of Coroplast w/a large step+repeat between two layers, then linked that sheet into an assembly twice in the two transverse orientations, those were then each step+repeated with a 1-sheet gap to accommodate one another to form the entire stack. The BRL-CAD libraries are designed primarily for the geometric modeler who also wants to tinker with software and design custom tools. It does also support boundary representation. The most recent thing was modeling a heat exchanger made of transversely stacked Coroplast sheets. This means BRL-CAD can 'study physical phenomena such as ballistic penetration and thermal, radiative, neutron, and other types of transport'. BRL-CAD is a powerful cross-platform open source combinatorial Constructive Solid Geometry (CSG) solid modeling system that includes interactive solid geometry editing, ray-tracing support for rendering and geometric analysis, network-distributed framebuffer support, image and signal-processing tools, path-tracing support for realistic. Here's some context on the kind of SolveSpace limitations I've encountered. I hope SolveSpace can get more attention to improve the performance problems, because I often find myself making models too complicated for it to handle before it gets bogged down then I end up halting progress on the project adding another "profile solvespace and optimize whatever is preventing further progress here" entry to my endless TODO list. Otherwise, its UI is minimal and stays out of the way for the most part, the way it encourages components residing in separate files then be linked into assemblies is very intuitive for a programmer like me, and it's proven to be quite stable. It's pretty great except it becomes unusably slow once models get complicated with lots of instancing through step+repeat operations. My goto for doing CAD stuff on Linux is currently SolveSpace. I tried FreeCAD over a year ago and it was so crashy it was useless.
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