Paint and tune a mask

1. Paint using the mesh’s UV layout: black excludes an area; brighter values attract more samples.
2. Assign Mask Texture and the matching UV Channel.
3. Set Mask Channel: 0 = Red, 1 = Green, 2 = Blue, 3 = Alpha.
4. Use Invert to swap high and low values. Threshold excludes values at or below its cutoff.
5. Use Power to shape relative density. Values above 1 favor bright regions; values below 1 give darker regions more weight. Rebake.

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1. 1
   Mask Texture

   Paint for this mesh’s UV layout.

2. 2
   UV Channel

   The UV set on the mesh.

3. 3
   Mask Channel

   0 is Red; 3 is Alpha.

4. 4
   Threshold

   Exclude faint values.

5. 5
   Power

   Shape density in the remaining region.

Mask	Result
None / white	Full available surface
Black	No valid sample locations
Black and white	The bank concentrates in white areas
Uniform gray above threshold	Still a full bank; gray is weight, not a count control
Gradient	More points in brighter areas

The baker reads mask values as linear data from the source image, with bilinear sampling and UVs clamped to 0–1. It does not modify source texture compression or streaming settings.