INNER CODE UNIT · TypeScript

computeNormalsFromBuffers

voxelize/voxelize · packages/core/src/core/world/index.ts:80

function computeNormalsFromBuffers(
  positions: ArrayLike<number>,
  indices: ArrayLike<number>,
): Float32Array {
  const normals = new Float32Array(positions.length);
  for (let i = 0; i < indices.length; i += 3) {
    const ia = indices[i] * 3;
    const ib = indices[i + 1] * 3;
    const ic = indices[i + 2] * 3;
    const e1x = positions[ib] - positions[ia];
    const e1y = positions[ib + 1] - positions[ia + 1];
    const e1z = positions[ib + 2] - positions[ia + 2];
    const e2x = positions[ic] - positions[ia];
    const e2y = positions[ic + 1] - positions[ia + 1];
    const e2z = positions[ic + 2] - positions[ia + 2];
    let nx = e1y * e2z - e1z * e2y;
    let ny = e1z * e2x - e1x * e2z;
    let nz = e1x * e2y - e1y * e2x;

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