Function CombineLightFaces

editor/editor_lighting.cpp:2743–2799

Returns number of verts in dest if face a can be safely combined with face b Returns 0 if not

// Returns number of verts in dest if face a can be safely combined with face b
// Returns 0 if not
int CombineLightFaces(vector *dest_verts, vector *averts, int nva, vector *norma, vector *bverts, int nvb,
                      vector *normb, int aroom, int broom) {
  int i;

  float dp;

  dp = vm_DotProduct(normb, norma);

  if (dp < LM_ADJACENT_FACE_THRESHOLD)
    return 0;

  ASSERT(nva > 2);
  ASSERT(nvb > 2);

  // Go through each vertex and get a match

  // If these two faces are in the same room and are on the same plane
  // then we should combine them by default

  if (1 || (aroom != -1 && aroom == broom)) {
    int dnv = 0;
    int match = 0;

    // Don't go over our point limit
    if ((nva + nvb) >= (MAX_VERTS_PER_FACE * 5))
      return 0;

    // Test to see if any points at all can touch

    for (i = 0; i < nva && !match; i++) {
      for (int t = 0; t < nvb && !match; t++) {
        if (PointsAreSame(&averts[i], &bverts[t]))
          match = 1;
      }
    }

    if (!match)
      return 0;

    // At least one point is the same, so combine them!
    for (i = 0; i < nva; i++) {
      dest_verts[dnv] = averts[i];
      dnv++;
      ASSERT(dnv < MAX_VERTS_PER_FACE * 5);
    }

    for (i = 0; i < nvb; i++) {
      dest_verts[dnv] = bverts[i];
      dnv++;
      ASSERT(dnv < MAX_VERTS_PER_FACE * 5);
    }

    return dnv;
  }

  return 0;
}