The best tools for painting shaders on 3D models are specialized 3D texture painting software like Substance Painter, Blender’s Texture Paint mode, and Mari—they integrate painting directly with shader workflows for seamless results.
These tools let you: - Paint key texture maps (albedo, roughness, metallic) that define shader appearance, - Preview shader changes in real time as you work, - Export maps compatible with game engines (Unity/Unreal) or renderers (Arnold/V-Ray).
For beginners, start with Blender’s free Texture Paint mode to practice basic shader painting before trying paid tools like Substance Painter for advanced capabilities.