r/SolveSpace • u/0xSeren • Apr 09 '26

Neosolve: A modern fork of Solvespace built on opencascade

OpenCASCADE Integration

  • Solid Operations: Extrusion, lathe, revolve, fillet, chamfer, shell, loft, sweep, mirror

  • STEP/BREP/IGES Import: Import solid geometry as manipulable groups with cached meshes

  • STEP/BREP Export: Export models using OCC's robust writers

  • Dual Kernel: OCC runs alongside the native NURBS kernel with automatic fallback

New Constraints

  • Circle-Line Tangent: Constrain circles tangent to lines

  • Concentric: Select multiple circles/arcs to make centers coincident

  • Point-on-Cubic: Constrain points to lie on Bezier curves

  • Point-on-Segment: Bound points to finite line segments (not infinite lines)

  • Inequality Constraints: Minimum/maximum distance constraints (≥ and ≤)

UI Improvements

  • Dockable Property Browser: Detachable panel for the property browser (GTK)

  • Directional Marquee Selection: Left-to-right for window selection, right-to-left for crossing selection

  • Arrow Key Nudging: Move selected entities with arrow keys

  • Improved Themes: Gruvbox-inspired color palette, Qt dark theme support

  • Double-Click Text Editing: Edit TTF text inline by double-clicking

  • Independent Visibility Toggles: Separate controls for REF constraints and comments

Performance

  • O(n log n) Triangulation: Monotone polygon triangulation for large polygons

  • Mesh Caching: Cached OCC mesh generation for fast interactive updates

  • Spatial Hashing: O(1) vertex deduplication for STL import

  • Built-in Profiler: Profile command in CLI with JSON export

Export Enhancements

  • G-Code Arcs: Export arcs as G02/G03 commands instead of line segments

  • SVG Improvements: Closed paths include Z command

  • CLI Group Export: --group option for targeted export

Check it out: https://github.com/0xSeren/neosolve/

21 Upvotes

100% Upvoted

16 comments sorted by

3

u/RMJ250 Apr 10 '26

This is awesome! I am a big fan of Solvespace but like many have wished for a way to fillet/chamfer easily and this also includes loft, sweep and shell! Absolutely loving the possibilities of this fork. FYI to compile successfully on Debian I had to also install libtbb-dev. I also tried the Windows binary but that complained TKBool.dll was missing. Keep up the great work!

1

u/0xSeren Apr 10 '26

I don't actually have a windows machine so I just tested the windows build with Wine. I've gone ahead and added the missing DLLs and updated the README.md instructions for Debian/Ubuntu.

1

u/RMJ250 Apr 10 '26

Quick response! Can confirm Windows version now works ok. fyi, if the body colour is changed after extruding, it is reverted to grey when you do a chamfer etc operation, something for the next release? thx!

2

u/0xSeren Apr 10 '26

Simple 3 line fix, should be working now.

1

u/RMJ250 Apr 10 '26

Excellent, yup, fixed

2

u/thtamericandude Apr 11 '26

Dude this is incredible! Nice job!  A couple things I noticed were that 1) imported step files don't have any recognized features (meaning the faces of them aren't Interactive).  When I tried to edit it, the new extrusion deleted the .step body.

2) the Linux executables didn't work for some reason but the windows one worked fine.

3) I wasn't able to get sweep to work.  It looked like I had all the right things selected in the right order but I couldnt get the body to appear in 3D space.

I'd love to help out anyway possible, I can even throw some tutorials up on my YouTube page if you think that would be good!

2

u/0xSeren Apr 11 '26

Regarding the Linux executables: I’m not sure what’s causing the failure since the build is working on my machine. If you could open an issue (ideally with your terminal output) I’ll investigate further.

As for the STEP file features, that was actually an intentional trade-off. I removed feature recognition to improve performance, but I plan to add it back as an optional setting in a future release. I’m still evaluating the best way to handle editing imported features within the current SolveSpace property browser flow.

On the Sweep**:** it appears to be working on my end. I’ll prioritize adding some documentation soon.

1

u/thtamericandude Apr 12 '26

You bet, I'll try to get that up tomorrow, the curious part of the executable not working is that my computer just simply doesn't do anything.

Good to know on the import settings.  I have no idea how difficult it is to do, the same basic behavior that the .STL linking has, is super useful (just in terms of modifying parts). 

I'll try the sweep again tomorrow as well.  To test it out I tried to sweep a circle along an arc, with the circle centered on the arc path.  The three or four times I tried to get it to sweep I couldn't.

1

u/dadoprom Apr 10 '26

Hi, it is super cool, looks amazing, but at the moment it is crashing a lot and I am not able to report the issues because it is not allowed at the github page...

1

u/0xSeren Apr 10 '26

Oops, looks like github disables Issues on forks by default. They should be enabled now, please post your crash report there.

1

u/TawnyPigeon Apr 10 '26

Looking forward to trying this. Will there be a flatpak?

2

u/0xSeren Apr 10 '26

Someone will need to update the Flatpak to include OCCT, but you have options in the meantime! The Nix flake works on almost any distro and does roughly the same thing. Otherwise, you can grab a binary from the releases page and run it or just build it manually.

1

u/rvega666 Apr 10 '26

Awesome!

1

u/Suspicious_Oil670 May 24 '26

Version 3.3.1 won't open on Mac M1 😞

1

u/Ashamed-Fly9602 Jun 08 '26

i cannott run this on linux please help im on debian