examples/experimental/webgl-2d.js
function getNormalizedPrimitive3D ({ positions, cells, normals, uvs }, opt = {}) {
    return {
      positions,
      uvs,
      normals,
      cells
    };
  }
function getNormalizedPrimitive3D ({ positions, cells, normals, uvs }, opt = {}) {
    return {
      positions,
      uvs,
      normals,
      cells
    };
  }
function getNormalizedPrimitive3D ( { positions , cells , normals , uvs } , opt = { } ) { return { positions , uvs , normals , cells } ; }
A unit 3D sphere, torus, etc
A unit 3D sphere torus etc