# Physics Tools - generate convex shapes and concave silhouette chains of boxes **URL:** \ **Category:** The Defoldmine\ **Created:** [February 19, 2026, 11:33am UTC](https://forum.defold.com/t/physics-tools-generate-convex-shapes-and-concave-silhouette-chains-of-boxes/82400 "2026-02-19T11:33:21Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![aglitchman](https://forum-defold.b-cdn.net/user_avatar/forum.defold.com/aglitchman/32/19432_2.png) [@aglitchman](https://forum.defold.com/u/aglitchman)\ **Post date:** [February 19, 2026, 11:33am UTC](https://forum.defold.com/t/physics-tools-generate-convex-shapes-and-concave-silhouette-chains-of-boxes/82400/1 "2026-02-19T11:33:21Z")
![logo](https://github.com/indiesoftby/defold-physics-tools/blob/main/cover.jpg?raw=true) Hey everyone! I’m excited to share a set of editor scripts to generate Defold physics shapes for 2D physics from images.. ### Convex Shape Generator This tool computes a convex hull of all non-transparent pixels. ![image](https://forum-defold-uploads.b-cdn.net/original/3X/8/d/8d46d1b8a20cf16eeae73f78021f021a9ae99120.png) ### Silhouette Chain Generator (Concave Walls) Since Box2D doesn’t natively support concave polygons for dynamic physics, this tool solves that by creating a **chain of thin boxes** that trace the silhouette of your image. ![image](https://forum-defold-uploads.b-cdn.net/original/3X/6/9/69e66a1fafea00422482866e7c8c00f1143ef665.png) The extension uses a command-line tool written in Zig to process the images and includes pre-compiled binaries for Windows, macOS (Intel/Silicon), and Linux, so it just works everywhere. Available at → [GitHub - indiesoftby/defold-physics-tools: Stuff to help with 2D physics in the Defold game engine · GitHub](https://github.com/indiesoftby/defold-physics-tools) Feel free to try it out and let me know if you have any feedback or feature requests! Happy Defolding! 🌠