public Vertex5 set(Vertex5 vert) {
   vec.set(vert.vec);
   uv.set(vert.uv);
   return this;
 }
 public Vertex5 apply(UVTransformation t) {
   uv.apply(t);
   return this;
 }
 public Vertex5 set(double x, double y, double z, double u, double v, int tex) {
   vec.set(x, y, z);
   uv.set(u, v, tex);
   return this;
 }