Undo changes made on terrain's splatmap

Question

Hello,

I have a script that changes automatically the splatmap of a terrain. I would like to be able to undo the changes made by this script through the Unity undo system.

Here is one of the code I've tried:

 Undo.RegisterUndo(myTerrain.terrainData, "Automatic Paint - " + myTerrain.name);
 ChangeMySplatMapData(myTerrain);

Does anyone know how to make it work? (I really would like to avoid Undo.RegisterSceneUndo because my scene is really heavy)

Thanks ;-)

Answer 1

Answer by ModLunar · Jul 16, 2017 at 03:17 AM

I ran into a similar issue with trying to record undo on my terrain's TerrainData before modifying the heights. For my issue, I found that the Undo.RegisterCompleteObjectUndo function worked, so maybe try that?

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MxBoud · Jun 19, 2018 at 04:32 PM 0

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Thank's. This worked for me.

ThePilgrim · Jun 29, 2018 at 01:10 PM 0

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This worked for me too, thanks!

         Undo.RegisterCompleteObjectUndo(terrain.terrainData, "$$anonymous$$odify Terrain");

Answer 2

Answer by gilley033 · May 16, 2013 at 05:11 PM

Still looking for an answer on this one. Registering the terrain data should work since the splat map, like the height map, is part of the terrain data; but it doesn't. Has to be a bug.

In the meantime, I guess you have to just implement your own solution. Save the splat map before changing it and create a button that reloads the saved map when you press it.

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gilley033 · Nov 24, 2013 at 05:20 AM 0

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Undoing changes to the alphamap still isn't fixed with the new Undo system. It's obvious there is a way, or else Unity wouldn't be able to allow you to undo texture painting. Anyone have a clue?

hoekkii · Dec 26, 2014 at 06:24 PM 0

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I have this problem to... What I did, is creating my own undo, where you can save terrain splatmap (float[,,]) on the stack, and load when pressing a button

Answer 3

Answer by THE2FUN · Sep 25, 2021 at 09:39 PM

You can fix : https://www.youtube.com/watch?v=bxocsAmweC0&ab_channel=THE2FUN

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Undo changes made on terrain's splatmap

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