Here is a way to do Dynamic Texture Painting in Unity : r/Unity3D
Unity Tutorial - Sculpt, Texture & Paint Assets on the Mesh
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TerrainPainting on a custom mesh - Unity Forum
Polybrush
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Unity 2017 – Rocks Turn Red | Austin Tate's Blog
ProBuilder-Unity sur Twitter : "Today! Learn to use ProBuilder and Polybrush together, and make your own "Asteroid World" entirely in-Unity. From basic mesh editing to sculpting, texturing blending, and prefab scattering, it's
Mesh Terrain Editor, a mesh-based terrain creator, converter and editor | Page 2 - Unity Forum
Runtime Mesh Manipulation With Unity | raywenderlich.com
Runtime Mesh Manipulation With Unity | raywenderlich.com