Spheriphy box three.js

gistfile1.txt

function createGeometry() {
  const r = 2
  const geometry = new THREE.BoxGeometry(2, 2, 2, 32, 32, 32)
  const positionAttribute = geometry.attributes.position

  for (let i = 0; i < positionAttribute.count; i++) {
    const x = positionAttribute.getX(i)
    const y = positionAttribute.getY(i)
    const z = positionAttribute.getZ(i)

    positionAttribute.set(
      [
        x * Math.sqrt(1 - (y * y) / 2 - (z * z) / 2 + (y * y * z * z) / 3) * r,
        y * Math.sqrt(1 - (z * z) / 2 - (x * x) / 2 + (z * z * x * x) / 3) * r,
        z * Math.sqrt(1 - (x * x) / 2 - (y * y) / 2 + (x * x * y * y) / 3) * r,
      ],
      i * 3
    )
  }

  return geometry
}