“Generate a realistic 3D model of a rock with an oval, slightly flattened shape – not perfectly spherical, but wider and irregular. The whole rock should be cut cleanly in half to create two separate pieces. Each half should look like a natural stone fragment – rough surface, small cracks, irregular edges. One side of the rock should be taller, giving the overall form a more asymmetric and natural appearance. The cut surfaces must be perfectly flat and smooth so they can be used as bases. Style: realistic natural stone in gray tones with subtle variations. Output format: 3D printable file (STL/OBJ).”