solvespace
BezierInfo-2
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solvespace | BezierInfo-2 | |
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69 | 20 | |
3,005 | 2,266 | |
1.2% | - | |
7.0 | 5.0 | |
5 days ago | about 2 months ago | |
C++ | HTML | |
GNU General Public License v3.0 only | GNU General Public License v3.0 or later |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
solvespace
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Ask HN: What rabbit hole(s) did you dive into recently?
Can second this!
However, I would recommend https://solvespace.com! It hits a sweet spot between features vs complexity/learning effort.
- My favorite code comment/rant
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Why large companies and fast-moving startups are banning merge commits
We use rebase on solvespace, along with sensible squashing so most commits along master are pretty self contained. You can see the clean history here:
https://github.com/solvespace/solvespace/commits/master/
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A one line code change inside iOS made me waste 5 minutes
I changed a behavior to the "more standard" one because it felt obviously right. This was a 3 line change. But the was enough backlash right there in the pull request. So I spent a couple hours remembering how to add a configuration option to keep the old way for those guys:
https://github.com/solvespace/solvespace/pull/1425
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RattleCAD
> If you like Linkage, you might also like Solvespace.
No, I mean Brent Curry's Linkage[1] bicycle design software, not David Rector's Linkage Mechanism Designer and Simulator[2].
You should read Wikipedia article.[0]
N.B. About SolveSpace, as I'm its experienced user[youtube,patreon], I may say next: yes, it could be used for bike mockup, as any other CAD, but it still has a lot of limitations and even does not export correct STEP files yet[3], and in FreeCAD such STEP could fixed only partially.[video]
So, for serious 3D CAD work I highly recommend use FreeCAD (and LibreCAD for 2D CAD work) instead of SolveSpace, and use SolveSpace only as a helper tool like a calc or as a notepad for noting ideas.
About Linkage Mechanism Designer and Simulator, it is only useful for planar (2D) kinematics analyze, and if You are looking an alternative for it take a look on Pyslvs[4], that is in part based on SolveSpace's solver.
[0] https://en.wikipedia.org/wiki/rattleCAD#History
[1] https://bikechecker.com/
[2] https://blog.rectorsquid.com/linkage-mechanism-designer-and-...
[3] https://github.com/solvespace/solvespace/issues/206
[4] https://github.com/KmolYuan/Pyslvs-UI
[video] https://www.youtube.com/watch?v=F3LJMeqUDrU
[youtube] https://www.youtube.com/@appsoft
[patreon] https://patreon.com/app4soft
- SolveSpace has been ported to Qt
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Ask HN: What are some of the most elegant codebases in your favorite language?
C++ this file covers all the math for working with NURBS curves and surfaces:
https://github.com/solvespace/solvespace/blob/master/src/srf...
There is a lot more in other files - triangulation, booleans, creation - but the core math functions are there in very readable form.
- My favorite rant in a code comment (on OpenGL compatibility)
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The Great CPU Stagnation
>> Maybe somebody has statistical survey of how much of the existing deployed CPU core count is typically used?
My guess is very few cores are used on average. I did some testing with Solvespace to see which build options contributed most to performance:
https://github.com/solvespace/solvespace/issues/972
Obviously using OpenMP for multi-core was the big win. But what's not shown is that in typical usage (not the test I ran) if you're dragging some geometry around it will use all cores (in my case 4 cores / 8 threads) at about 50 percent utilization. That percentage probably drops as more cores are thrown at it due to Amdahl's Law. In other words, throwing double the cores at it will give a good boost to a lot of code that is already taking less than half the time (wall clock time, not CPU time).
We added OpenMP to a number of functions for significant performance gains. And in fact, any remining single-thread operation that gets the parallel treatment is likely to have a significant impact on overall performance since that is where most of the time is spent now. At this point we're more focused on features and bugs.
Algorithmic improvements are possible and I'd like to do those in the future, but they are much harder to do than sprinkling some #pragmas around critical loops. That will improve the scalability though, where multithreading really did not.
- Free, mac compatible, relatively easy CAD/CAM software?
BezierInfo-2
- Flattening Bézier Curves and Arcs
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Solution needed
For the bezier you need 4 control points via a click, then evaluate using lerps (or basis functions). Start here https://pomax.github.io/bezierinfo/
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Hexagonal Grids
> How to pack geometric shapes inside other shapes https://erich-friedman.github.io/packing/
Packing / bin-packing is very serious stuff: savings made there directly translate to less waste / reduced costs (for example when cutting shapes into sheets of metal in big factories).
> * Amazing reference on bezier curves https://pomax.github.io/bezierinfo/
And some beautiful graphs in there, notably those under section 26 "Curvature of a curve". Screenshot'ed for my own collection of good looking stuff!
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Visualization of Common Algorithms
https://pomax.github.io/bezierinfo/#explanation
A visual overview of commonly used creative coding related techniques and algorithms.
- A Primer on Bézier Curves
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Text Rendering Hates You
I wrote an openGL font renderer once, it was a lot of fun. Bezier curves are such an elegant technique. The difference between what I wrote and what you'd use in a proper environment is pretty big, but I recommend it sometime.
Fonts are pretty much just third or fourth degree beziers, iirc (i may have my terminology wrong). Try it out sometime, I did mine using tessellation shaders.
Btw, you'll never find a better guide on beziers than here:
https://pomax.github.io/bezierinfo/
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How to get the smoothness of a cubic Bezier curve in Apache Commons math3.
Alternatively you can use the equation of a cubic Bézier curve to do the computations yourself. This website offers great explanations and examples of the math behind Bézier curves: https://pomax.github.io/bezierinfo/
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[Media] I'm making a new open source font editor with gtk-rs. I just managed to make non-linear curves with my Bézier path tool for the first time!
Btw, for Bezier math this is a great resource: https://pomax.github.io/bezierinfo/
- Transforming a parametric equation into explicit equation
- Linii bezier cu coliziune
What are some alternatives?
cadquery - A python parametric CAD scripting framework based on OCCT
BezierCurveTool2.0
Autodesk-Fusion-360-for-Linux - This is a project, where I give you a way to use Autodesk Fusion 360 on Linux!
CAM6 - Cellular Automata Machine (CAM6) Simulator
blender-cad-tools - a collection of Blender addons to make CAD design with Blender even more enjoyable
bezmouse - Simulate human mouse movements with xdotool
FreeCAD_assembly3 - Experimental attempt for the next generation assembly workbench for FreeCAD
spiral_cube - How to convert between spiral and cube hexagonal coordinate systems
LibreCAD - LibreCAD is a cross-platform 2D CAD program written in C++17. It can read DXF/DWG files and can write DXF/PDF/SVG files. It supports point/line/circle/ellipse/parabola/spline primitives. The user interface is highly customizable, and has dozens of translations.
SoftwareRenderer - Software rendering engine with PBR. Built from scratch on C++.
DesignSpark-Mechanical-for-Linux
Skia - Skia is a complete 2D graphic library for drawing Text, Geometries, and Images.