stress relief stone 3d model

Generate a high-resolution, production-ready 3D model of a handheld tactile stress-relief object named “Multi-Texture Stress Stone.” Form & Geometry: The object should have an organic, asymmetrical pebble-like form inspired by naturally eroded river stones. The geometry must be smooth, continuous, and ergonomically contoured to fit comfortably within the human palm. Exact dimensions: Length: 40 mm Width: 30 mm Thickness: 15 mm All edges and transitions must have soft fillets (minimum 2–3 mm radius) to eliminate sharp edges and ensure comfort during prolonged use. Ergonomic Features: Include a centrally positioned thumb indentation: Depth: 1.5 mm Shape: elliptical concave depression Orientation: aligned with natural thumb resting position when held in one hand The indentation must smoothly blend into the surrounding surface without harsh transitions. Tactile Zones (Clearly Segmented but Integrated): Divide the surface into 4 distinct tactile interaction regions, each subtly separated by curvature rathe