Object3D plane1 = Primitives.getPlane(1, 10f);Object3D plane2 = Primitives.getPlane(1, 10f);plane2.rotateX((float) Math.toRadians(90));Object3D merged = Object3D.mergeObjects(plane1, plane2);world.addObject(merged);world.buildAllObjects();
plane2.rotateMesh();plane2.clearRotation();