Surface Brush Studio — Paint, Scatter & Physics Placement

Surface Brush Studio is an editor tool designed to speed up environment creation inside Unity. It gives artists and level designers a direct brush-based workflow for painting vertex channels, scattering prefabs, dropping objects with live physics, sculpting mesh surfaces, applying placement rules and baking clean results. Instead of manually placing grass, rocks, debris, props or terrain details one by one, Surface Brush Studio lets you work directly in the Scene View with intuitive brush controls, presets, target locking and cleanup tools. Use it for environment dressing, terrain detail passes, debris placement, survival scenes, forest floors, rocky areas, camping props, rubble fields, path dressing and fast level art iteration. Key Features include Vertex Paint to paint directly on mesh vertex colors using RGBA channels with Add, Erase, Smooth and Replace modes, Face and vertex preview in Scene View, Fill, Clear and Smooth All tools, adjustable radius, strength and falloff, Shift shortcut for temporary erase, and fast brush workflow directly in Scene View. Scatter Placement lets you scatter prefabs across a selected surface using brush strokes with multiple prefab support, per-prefab influence control, per-prefab scale range, scatter presets such as Grass, Debris, Rocks, Forest, Camping and Rubble, random yaw, density multiplier, align to surface, scene object counter, auto parent organization, and Paint, Erase and Replace scatter modes. Collision-Aware Scatter helps avoid unwanted overlapping while scattering objects with avoid collisions toggle, use prefab bounds, check existing scatter objects, check scene colliders, collision radius control, collision layer mask, and max placement attempts. Live Physics Placement lets you place objects using temporary physics and bake the settled result with Drop, Roll, Pile, Throw and Scatter Drop modes, Fast, Stable and Precise quality modes, live physics object tracking, moving and settled object counters, random force, random torque, mass range, drop height control, fix intersections, bake settled objects, optional collider keeping, remove temporary rigidbodies, and move baked results to a clean parent. Mesh Sculpt lets you shape editable mesh surfaces directly in the editor with Raise brush, Lower brush, Smooth brush, Flatten brush, Smooth All, Flatten All, Reset Sculpt, radius and strength controls, and shortcut support for fast adjustments. Bake and Cleanup lets you finalize your edited scene with cleanup tools including Create backup, Save mesh, Bake physics, Validate, Fix issues, Clean baked components, Reset paint, Reset sculpt, and Reset paint plus sculpt. Compatible with Built-in Render Pipeline, URP, and HDRP.