Triangle Geometry in Three.js

You're right that Three.js doesn't include a dedicated TriangleGeometry primitive in its core library. While Three.js offers many geometry primitives like BoxGeometry, SphereGeometry, and PlaneGeometry, a specific triangle geometry is indeed missing from the standard set.

For those looking to create triangular planes in Three.js, there are several approaches you could take:

1. Use a PlaneGeometry and modify it
2. Create a custom BufferGeometry with triangle vertices
3. Use ShapeGeometry with a triangular path
4. Use a third-party solution like the one you've created

Your custom TriangleGeometry generator could be quite useful for the community, especially for those who need triangular planes with features like subdivision (as shown in your image).

If you're looking for alternatives within the existing Three.js library, you might consider using:

• PlaneGeometry with appropriate scaling and transformations
• BufferGeometry with manually defined vertices
• One face of a TetrahedronGeometry

Thank you for sharing your solution with the community. Custom geometries like this can be valuable additions to the Three.js ecosystem even if they don't make it into the core library.