Why does my Foliage paint brush leave nothing?

Density per 1Kuu too low, Slope filter excludes terrain angle, or Place On Landscape disabled. Open the foliage type asset, raise Density to 100+, set Slope max to 89, ensure Place On Landscape is true.

What if I want to paint only on landscape, not actors?

Use the Filters section: Place On Landscape true, Static Mesh false, BSP false. Brush only places on the landscape mesh.

Eraser doesn't remove?

Hold Shift while painting to erase only the selected foliage type. Hold Ctrl-Shift to erase all types under the brush.

Fix: Unreal Foliage Paint Tool No Instances

Quick answer: Foliage Type → Density: 100+. Place On Landscape: true. Slope: 0..89. Brush size large enough.

You drop a Foliage Type, paint, see nothing. Density default of 1 means roughly one instance per kilo-unit-squared at full coverage — effectively zero in a small brush.

The Fix

FoliageType_Grass:
  Painting:
    Density / 1Kuu²:        200
    Radius:                  10     // minimum spacing per instance
  Filters:
    Place On Landscape:      true
    Place On Static Mesh:    true
    Place On Foliage:        false
  Placement:
    Slope (Min/Max):         0 / 45     // 89 to allow steep
    Z Offset:                0

Foliage panel:
  Brush Size:                256
  Paint Density:             1.0

Density is the absolute knob. Filters/slope rule out unwanted surfaces. Brush radius is overall stroke size; Paint Density is how aggressive each click is at saturating that area.

Verifying

Paint a stroke. Instance count rises in the Foliage panel. Slope-rejected areas (cliffs) stay empty.

“Density up. Filters set. Slope generous. Paint sticks.”

Related Issues

For foliage HISM lighting, see HISM lighting. For RenderTarget canvas, see RT canvas.

Density up. Filters right. Paint takes.