apply 3D wood prism...

3dwood-uvw.js

function ensureMeshUvws(geometry) {
  // If mesh has no uvws, generate them by copying the vertex position vectors
  // (x,y,z) => (u,v,w). We apply no transform. All geometry loaded by lmvtk uses
  // this interleaved vertex buffer approach. We have to get the vertex position
  // vectors out of the interleaved vertex buffer.
  if (!geometry.getAttribute('uvw')) {

    let vbb = ggeom.vb;   // should always be 3


    let vo = geometry.getAttribute('position').itemOffset; // should always be 0
    let vz = geometry.getAttribute('position').itemSize;   // should always be 3
    let vs = geometry.vbstride;
    let vb = geometry.vb;
    let vn = vb.length / vs;
    let wb = new Float32Array(vn * vz);
    for (let vi = 0; vi < vn; vi++) {
        wb[vz * vi + 0] = vb[vs * vi + vo + 1];
        wb[vz * vi + 1] = vb[vs * vi + vo + 2];
        wb[vz * vi + 2] = vb[vs * vi + vo + 0];
    }
    geometry.addAttribute('uvw', new THREE.BufferAttribute(wb, vz));
  }
}