Vertex Channel Model (RGBA)
- Background
- Base/Rock layer visible where no blend channels are painted.
- Green (G)
- Primary blend layer, typically moss or grass overlays.
- Blue (B)
- Secondary blend layer, often used for dirt paths and breakup.
- Alpha (A)
- Wetness control driving darkening, porosity response, and puddle behavior.
- Red (R)
- Variation mask that blends between Set A and Set B property groups.