Orthonormal basis

As seen in this shader

https://www.shadertoy.com/view/lldGRM

Imagine you wanted to orient houses, trees, and tigers on a small asteroid surface, or you wanted to grow hair on a shape.

Start by reviewing the linked Shadertoy shader to understand the orthonormal-basis concept and its use for orienting objects on surfaces. The issue needs a concrete scope and a defined deliverable before implementation can begin.

索引モデルが issue の本文から書いたものです。