- function calcNormals(vertexList, normalList, i)
- {
- var vertex1 = [vertexList[i + 0], vertexList[i + 1], vertexList[i + 2]];
- var vertex2 = [vertexList[i + 3], vertexList[i + 4], vertexList[i + 5]];
- var vertex3 = [vertexList[i + 6], vertexList[i + 7], vertexList[i + 8]];
-
- var ax = vertex1[0] - vertex2[0];
- var ay = vertex1[1] - vertex2[1];
- var az = vertex1[2] - vertex2[2];
-
- var bx = vertex2[0] - vertex3[0];
- var by = vertex2[1] - vertex3[1];
- var bz = vertex2[2] - vertex3[2];
-
- var nx = ay * bz - az * by;
- var ny = az * bx - ax * bz;
- var nz = ax * by - ay * bx;
-
- var len = Math.sqrt(nx * nx + ny * ny + nz * nz);
-
- if (len == 0)
- {
- len = 1;
- }
-
- normalList.push(nx / len, ny / len, nz / len);
- normalList.push(nx / len, ny / len, nz / len);
- normalList.push(nx / len, ny / len, nz / len);
- }
