Method computeFaces

src/webgl/p5.Geometry.js:825–840

* Computes the geometry's faces using its vertices. * * All 3D shapes are made by connecting sets of points called *vertices*. A * geometry's surface is formed by connecting vertices to form triangles that * are stitched together. Each triangular patch on the geometry's surface is * c

()

   * }
   */
  computeFaces() {
    this.faces.length = 0;
    const sliceCount = this.detailX + 1;
    let a, b, c, d;
    for (let i = 0; i < this.detailY; i++) {
      for (let j = 0; j < this.detailX; j++) {
        a = i * sliceCount + j; // + offset;
        b = i * sliceCount + j + 1; // + offset;
        c = (i + 1) * sliceCount + j + 1; // + offset;
        d = (i + 1) * sliceCount + j; // + offset;
        this.faces.push([a, b, d]);
        this.faces.push([d, b, c]);
      }
    }
    return this;
  }

  _getFaceNormal(faceId) {
    //This assumes that vA->vB->vC is a counter-clockwise ordering