Change Terrain Heightmap Resolution without Resizing Terrain

Question

Inspector Behaviour (Desired Effect)

When I change my terrain's heightmap resolution through the inspector via:

Terrain -> Terrain Settings -> Texture Resolutions (On Terrain Data) -> Heightmap Resolution,

the resolution of my heightmap is increased without the terrain visibly changing.

Script Behaviour (Unexpected Effect)

However, when I try to recreate this behaviour via script like so: Terrain.activeTerrain.terrainData.heightmapResolution = 1025;

The terrain not only changes heightmap resolution but also size, with very strange effects like repeating textures etc.

How can I resize the heightmap via script WITHOUT any visible changes to the terrain, exactly as done via the inspector?

Essentially, I want to produce the exact same change produced by selecting the following, but via a script:

alt text

Answer 1

Answer by subliminal_1 · Dec 30, 2020 at 02:07 AM

I'm having the same problem. I can generate a scripted terrain at a heightmapScale of (1, 200, 1), but with terrain at size 4096 the heightmapResolution must be 4097. Then I can manually lower the heightmapResolution in the editor to say, 257 which then works fine after applying the "resizing" button in the Unity Terrain editor. Then I see (via script) that the heightmapScale has been reset by the editor's resizing to the value (16, 200, 16). This all makes sense since 16*256 + 1 = 4096 + 1.

However, my problem is that I have to do this manually for all of my terrain tiles. Why can't Unity support the editor's resizing button with a scripting function? Or simply provide a scripting function to map lower resolution heightmaps onto terrains? Is some way to do this?

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kenncann · Mar 29, 2021 at 02:16 AM 0

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Did you ever find a solution for this? I'm having the exact same problem

kenncann kenncann · Mar 30, 2021 at 06:58 AM 0

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Someone knew how it was implemented, see this thread here

https://forum.unity.com/threads/looking-for-advice-to-programmitcally-increase-heightmap-resolution.1083785/#post-6985445

Change Terrain Heightmap Resolution without Resizing Terrain

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