Note: “Diffusion” in SketchUp usually refers to (soft, organic, watercolor/sketch effects) or procedural texture diffusion , not AI image diffusion (like Stable Diffusion). This report focuses on free tools that create hand-drawn, sketchy, or soft diffuse visual styles directly inside or from SketchUp.
The primary "diffusion" plugin for SketchUp is SketchUp Diffusion diffusion sketchup plugin top free download
Unlike traditional rendering plugins (V-Ray, Enscape, Twinmotion), Diffusion does not require: Generates images directly inside SketchUp (not just texture
Note: These plugins run inside SketchUp (Windows / macOS). Always check compatibility with your SketchUp version before installing. What it does: Scatter copies components or groups