| inputLayer | TerrainLayer used for painting. |
| addLayerIfDoesntExist | Set to true to specify that the inputLayer is added to the terrain if it does not already exist. Set to false to specify that terrain layers are not added to the terrain. |
Gathers the alphamap information into sourceRenderTexture.
This function collects the alphamap data from all Terrain tiles in the PaintContext into sourceRenderTexture.
This function is called internally by TerrainPaintUtility.BeginPaintTexture.
Additional resources: PaintContext.ScatterAlphamap.