| colorFormat | Render Texture format. |
Creates the sourceRenderTexture and destinationRenderTexture.
The render textures are created at a resolution matching the current PaintContext.pixelRect, using the specified RenderTextureFormat.
This function is called internally by TerrainPaintUtility.BeginPaintHeightmap, TerrainPaintUtility.BeginPaintTexture and TerrainPaintUtility.CollectNormals.
Additional resources: PaintContext.destinationRenderTexture, PaintContext.sourceRenderTexture