Experimental: this API is experimental and might be changed or removed in the future.
PaintContext
class in
UnityEngine.Experimental.TerrainAPI
/
Implemented in:UnityEngine.TerrainModule
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This class is used to apply an edit operation to an area of Terrain that may span multiple Terrains.
A PaintContext may be used to edit heightmap or splatmap data, and may also be used to gather normal data in read-only mode (you cannot write to normals, because they are derived from the heightmap).
A PaintContext will calculate the relevant regions on each Terrain, and collect the original data into a single sourceRenderTarget.
Your edit operation can then read from sourcerenderTarget, and write the modified data to destinationRenderTarget.
Once you have applied your edit operation, the PaintContext can also write the modified data in destinationRenderTarget back to each Terrain, ensuring no seams between them.
The simplest way to use a PaintContext is through the helper functions in TerrainPaintUtility:
TerrainPaintUtility.BeginPaintHeightmap, TerrainPaintUtility.EndPaintHeightmap, TerrainPaintUtility.BeginPaintTexture, TerrainPaintUtility.EndPaintTexture, TerrainPaintUtility.CollectNormals and TerrainPaintUtility.ReleaseContextResources.
You can also use PaintContext more directly through its member functions. In general, they are used in the following order:
1) Constructor, PaintContext.CreateFromBounds - Construct a PaintContext with a target Terrain and a region to edit
2) PaintContext.CreateRenderTargets - Create the source and destination RenderTargets
3) PaintContext.GatherHeightmap, PaintContext.GatherAlphamap, PaintContext.GatherNormals - Read from Terrains into sourceRenderTarget
4) PaintContext.ScatterHeightmap, PaintContext.ScatterAlphamap - Write from destinationRenderTarget into Terrains (optional)
5) PaintContext.Cleanup - Destroy RenderTarget resources (required if you call CreateRenderTargets)
See Also: TerrainPaintTool<T0>