Skip to main content
Grass Brush is an interactive painting tool dedicated to Unity Terrain detail layers — grass, flowers, and mesh details. You paint directly in the scene view with the same mask filter and density systems that power the Grass Stamper.
New to Grass Brush? Follow the step-by-step Grass Brush — Getting Started tutorial first.

​
Supported resource types

Grass Brush supports:
For painting GameObjects and Terrain Objects, use Object Brush. For painting terrain textures, use Texture Brush.

​
How it works

  1. Move the cursor over the scene view. The brush circle shows the area that will be affected.
  2. Click to paint once at the cursor position.
  3. Click and drag to paint continuously. Spawn points fire as the cursor moves, spaced according to Spacing in Brush Settings.
Each stroke evaluates the active Terrain Detail prototypes in the selected Group against the current brush area and writes density values to the terrain detail layer.

​
Features

​
Live visualization

Grass Brush draws a preview in the scene view while you hover:
  • With a single prototype selected and a Mask Filter active, the filter output is overlaid on the terrain inside the brush circle.
  • Otherwise, a simple area preview is drawn.

​
Shared settings with Grass Stamper

Groups and their detail settings are reusable. A Group configured for Grass Stamper can be used directly in Grass Brush without any extra setup.

​
Tool-level controls

​
Brush Settings

See Brush Settings for brush size, spacing, jitter, and mask type settings.

​
Group-level controls

All active Terrain Detail prototypes in the selected Group are painted on each stroke.

​
Prototype-level controls

​
When to use Grass Brush

Grass Brush is best when you want:
  • direct scene-view painting of grass and detail layers;
  • manual art direction to add dense grass patches, clearings, or specific undergrowth placement;
  • a mixed workflow where hand-painted details complement a Grass Stamper pass.