More subdivision options for icosahedron geometry

About the icosahedron geometry, I understand that the detail parameter is an option for subdividing each edge into more vertices, which are projected onto a sphere. However it seems that some possible subdivision are not allowed.

For example, this is the subdivision with detail = 1 :

And this is with detail = 2 :

It looks like the following in-between subdivision would be possible but is not currently allowed :

Is there an issue with this kind of subdivision ? If not, would you be interested in a PR ?

[marcofugaro]

I use this code to generate a sphere with more fine-tuned picking of the level of detail, maybe this can be useful to you

const segments = 2000
const geometry = new THREE.BufferGeometry()
const positions = new Float32Array(segments * 3)

// Uniform distribution of points on the surface of a sphere
// https://gist.github.com/AngeloYazar/6091095
let inc = Math.PI * (3 - Math.sqrt(5))
let off = 2 / segments
let radius = 1.5

for (let i = 0; i < segments; i++) {
  let y = i * off - 1 + off / 2
  let r = Math.sqrt(1 - y * y)
  let phi = i * inc

  positions[3 * i] = radius * Math.cos(phi) * r
  positions[3 * i + 1] = radius * y
  positions[3 * i + 2] = radius * Math.sin(phi) * r
}

geometry.setAttribute('position', new THREE.BufferAttribute(positions, 3))

[mrdoob]

I think a PR would be great 🙏