![]() ![]() That amazing library allows for completely generic numeric types, and the type OpenSCAD is using is some voodoo magic “exact” numeric type based on the GNU Multiple Precision Arithmetic Library (GMP). ![]() CGAL Nef Polyhedra + GMP = so precise it hurts (performance)Īs it turns out, OpenSCAD is using the Computational Geometry Algorithms Library (CGAL) for its CSG operations. #OPENSCAD LETTERS SOFTWARE#Slow enough to prevent me from doing what I wanted, which was to generate large, varying scalemail patterns:īut something was off: my slicer software (Cura) was able to handle 10x10 grids of my scalemail pattern without breaking a sweat, so why was OpenSCAD so slow? So after investigating alternatives (wasn’t keen to get locked in a certain popular but proprietary CAD software with huge a learning curve and high prices after its 1 year hobbyist licenses), I dove into OpenSCAD’s codebase and tried to understand what it was up to. Last year I grew fond of it to design ever more complex models, but started running into limitations: while interactive rendering was fine, the final rendering (creating the STL files to give to the 3D printing slicer) was horrendously slow. A simple declarative programming language defines Constructive Solid Geometry (CSG) operations like unions, intersections, differences, which can be parameterized with loops and variables. It’s essentially a CAD software for programmers with a minimalist UI. OpenSCAD is a popular open-source design tool for 3D printing afficionados (and others). Rewriting trees to increase laziness and parallelizability.What about multithreading? Or skipping operations altogether? □.CGAL’s other hidden gem: corefinement functions.CGAL Nef Polyhedra + GMP = so precise it hurts (performance).Note: opinions expressed here are my own. Make your models more ambitious and report issues / successes here! #OPENSCAD LETTERS DOWNLOAD#ALSO auto resize for Y only resizes based on the normal letter height and ignores tall and low letters.TL DR: OpenSCAD users: download a nightly build & enable fast-csg in settings for 10x faster render (YMMV). if I want to avoid "stretching" I experimented with the resize auto setting, but it's unpredictable, for example resizing the X direction only works for 1-7 letters, if I have more letters it stops working. low letters cause the resized text to have a negative Y displacement.Ģ. I can get very close with the resize command but have these issues:ġ. #OPENSCAD LETTERS HOW TO#My trouble seems to be that some letters are above the normal letter size (like Q) and some letters go below the normal letter size (like y, or g, etc), and I don't know how to accommodate for some text that has no lower letters and some that would have lower letters (the user is putting in text). I want the text to be as large as possible and fit at least one dimension perfectly.no slop. Hi, I am having some trouble figuring out how to automatically put user entered text into a box of given dimensions. ![]()
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