Function ScaleFaceUVs

editor/RoomUVs.cpp:195–215

Scale all the UV values in a face from the center point (as defined by averaging the u & v values)

// Scale all the UV values in a face from the center point (as defined by averaging the u & v values)
void ScaleFaceUVs(room *rp, int facenum, float scale) {
  face *fp = &rp->faces[facenum];

  int i;
  float midu = 0, midv = 0;

  for (i = 0; i < fp->num_verts; i++) {
    midu += fp->face_uvls[i].u;
    midv += fp->face_uvls[i].v;
  }

  midu /= fp->num_verts;
  midv /= fp->num_verts;

  for (i = 0; i < fp->num_verts; i++) {
    fp->face_uvls[i].u = midu + (fp->face_uvls[i].u - midu) * scale;
    fp->face_uvls[i].v = midv + (fp->face_uvls[i].v - midv) * scale;
  }

  World_changed = 1;
}