Regarding you can’t use no alternative softwares. You can make different shades of rocks, with realistic surface and edges with using unions and possibly the new smooth shading feature. If you want a more natural approach, or a realistic look, try using a union and make it the shape that you want with negative parts, whether your using spheres, wedges, and cylinders I’ll try experimenting into using the new feature if your wanting different shades of rocks with a more different appearance.
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