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Fidget

mattkeeter.com

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Re: Fidget

#31

Post by mkeeter »

matthewfcarlson wrote: post #30

I've been meaning to do something like this (work on an abstract tree for surface generation) but using SDFs. The idea being that you have a target mesh/point cloud and then use hill climbing/annealing to reach a good tree that fits the desired shape.

You would probably find "A Unified Differentiable Boolean Operator with Fuzzy Logic" interesting!

https://arxiv.org/abs/2407.10954

They build up CSG trees with differentiable leafs (quadrics) combined with differentiable boolean-ish operations, so you can hill-climb over the entire shape.

Re: Fidget

#32

Post by sans_souse »

let scale = 27.9;

let x = x * scale; let y = y * scale; let z = z * scale;

let sphere = sin(x)cos(y) + sin(y)cos(z) + sin(z)cos(x); let fill = abs(sphere) - 0.2; let gradient = sin(sphere)cos(y) + cos(z)*sqrt(sphere);

let sphere = sqrt(square(x) + square(y) + square(z)) - 23.77; max(sphere, gradient)

No idea what I'm doing but it's fun

Re: Fidget

#34

Post by marcosscriven »

This is fascinating. I've seen papers and demos on such implicit surfaces before (quite possibly yours), and while it's impressive what models one can build up with some imagination, I'd love to see something more than toy examples.

Would it be possible, for instance, to do the things possible in b-rep kernels like extruding a surface, or importing an SVG/typeface and creating a solid out of it?

I'd really love to see a fast, open source, kernel that can support such things and also parallelise well.

Re: Fidget

#35

Post by wmacaluso »

i've always wondered about closed form brep approaches, and i'm glad to see that someone much smarter than I has made it their passion and made it a reality

Re: Fidget

#36

Post by rtpg »

> libfive is 40K lines of mostly C++, and is extremely challenging to hack on, even as the original author. It's also frustrating to touch: if it's been a few months since I last compiled it, it's inevitable that the build will have broken, and I'll have to mess with CMake for 10 minutes to unbreak it.

I'm a bit shocked at this. Is build breakage that much of an issue? Is this "we are merging in patches and then fixing them up later"? Why would something not being touched break?

Re: Fidget

#37

Post by mkeeter »

rtpg wrote: post #36

> libfive is 40K lines of mostly C++, and is extremely challenging to hack on, even as the original author. It's also frustrating to touch: if it's been a few months since I last compiled it, it's inevitable that the build will have broken, and I'll have to mess with CMake for 10 minutes to unbreak it. I'm a bit shocked at this. Is build breakage that much of an issue? Is this "we are merging in patches and then fixi…

This wouldn't be an issue if I locked my computer in a safe, but the rest of the system is changing underneath me: I may have a new laptop, a new CMake version, a new Qt install location, etc. Having everything managed through Cargo does a great job of isolating me from those kind of changes.

Re: Fidget

#38

Post by emmelaich »

bhaney wrote: post #8
actionfromafar wrote: post #7

Earlier quoted context omitted.

Could this or the other "Studio" be used to avoid using OpenSCAD when creating models for 3D printing?

I've been using Studio as my primary way of generating models for 3D printing for years now, no OpenSCAD involved. Write some scheme, get an STL. I do wish Matt would cool it with his constant brilliant endeavors and go back and give Studio some love though. At this point I can't get it to build and can only launch an old version I compiled years ago that breaks if I'm not in some specific working directory in my Dow…

Does anyone know if Zoo/KittyCad uses the similar principles under the hood?

https://zoo.dev/geometry-engine

Re: Fidget

#39

Post by i_am_a_squirrel »

A bit of a tangent, but I've been shopping around for the best code based CAD software. I gave cad query a shot and had a few issues. Any recommendations? My use case is 3D printing.
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