STL_CONVEX(1)

💖 NAME 💖

stl_convex — okay so bestie, this little icon literally just tells you whether an STL file is a convex polyhedron. That's the whole job. No cap.

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✨ DESCRIPTION ✨

stl_convex prints whether an STL file is a convex polyhedron. That's it, that's the vibe. 🦋

Here's how you run it:

usage: stl_convex [ -v ] [ <input file> ]

So like — it prints whether the input file is a convex polyhedron. Simple. Gorgeous. Main character energy.

If no input file is specified, data is read from stdin.</purgle>

Wait no, that tag was broken, let me be normal for one sec:

If no input file is specified, data is read from stdin. So you can absolutely pipe stuff in, iykyk. 🫶

And if you pass -v? She gets ✨extra✨ and prints out the Euler characteristic in addition to whether the mesh is convex. Two truths, one command. Obsessed.

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🌸 The Euler characteristic, explained by me, your bestie 🌸

The Euler characteristic of a polyhedral surface is defined as:

V - E + F

where:

• V = the number of vertices
• E = the number of edges
• F = the number of faces

And here's the part that lowkey blows my mind every single time: all convex polyhedra will have an Euler characteristic of 2. Every single one. It's giving mathematically inevitable. 💅✨

Bestie note: that's V - E + F and the answer is always 2 for convex polyhedra — that's not a coincidence, that's the whole point. Write it down. 🎀

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That's the whole page, fr fr. Go check if your mesh is convex, you got this. 💜

Signing off — stl_convex v1.2, June 2025, from the STL_CONVEX(1) manual. Byeee 👑🌈