Terrain Toolbox import heightmap resolution errors

Tiles imported into the Import Heightmap dialog, and the Tiles section, report:

TerrainToolbox: Imported heightmap resolution is not power of two.
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

Well, it is actually. The menu options are not powers of two, they are powers of two plus one. I have tried tiles that are 2048 and 2049, but it throws this error every time. This on a 10km x 10km terrain.

Or would be if it worked.

 

I'm having the same issue, any updates?

 

Same thing here - Any chance to get that get solved ...?

 

+1 here and bumpedi-bump.

I've tried different images with the resolutions 1024 and 1025 as well as 2048 and 2049, but it won't let me import them with the error given by OT.

 

So nobody was able to solve it?

 

Got this to work, pretty easily by following the info in the docs explicitly.

That 'pretty easily' came at a price: multiple hours, over a couple of days of trial and error, including having a look at the underlying scripts. Unity really needs some better documentation for this tool.

In my case, i was converting a terrain i'd made in Second Life years ago into a heightmap that was compatible with Unity. Here are my steps at a high-level; one shouldn't need to follow all of them.

1. in a tool like GIMP (or other image manipulation tool) import your image in its native format.
2. the Terrain Tool has changed its behavior a bit in this update to specify that your heightmap must be a power of 2, therefore, in your image manipulation tool make sure the RESOLUTION, NOT THE SIZE is a power of 2 (128x128, 256x256...etc). This is going to seem strange if you have used this tool in the past, where you manually had to change your heightmaps to 257x257, but this is no longer necessary, as Terrain Tool now does this for you during the process of import.
3. ensure that your Precision or bit depth is 8-bit or 16-bit, floating point, with Perceptual Gamma sRGB. i tried both.
4. DELETE (not just disable) all layers except the one containing your heightmap. this is only necessary for those with multiple layers in their heightmaps, as with Second Life heightmaps. i wouldn't expect this step to be necessary for normal heightmaps, but i burned several hours not groking that disable still leaves the data available in the final file (thank the Maker for Hex Fiend).
5. export your new heightmap to .raw. if this step is completed correctly, a 256x256 px/in resolution of an image of 256x256 pixels will yield a file size of ~66KB (on a Mac).
6. import your new heightmap into Terrain Tool like normal, making sure that your Tile Height Resolution matches your power of 2 compatible resolution +1 (257 for 256x256).

following these steps i was able to convert a dozen or so heightmaps in about an hour, once i'd figured it out.

 

I couldn't fix this error by changing the image size or print resolution. After many hours, I found a Gimp path that works for me and avoids the error.

• I start with a 1024x1024 image in Gimp.
• greyscale, 8bit, no alpha channel (Layer->Transparency->Remove Alpha Channel)
  • Removing the alpha channel is necessary. If you don't you will get an erroneous error saying that the height map resolution is out of range.
  • In my case, I just leave the print size resolution at 72 pixels/inch (not a power of 2)
• File->Export As
  • Select File Type by Extension (end filename in ".raw")
  • RGB Save Type: Standard (R, G, B)
  • RGB Save Type: R, G, B (normal)
• In Unity I used the Terrain Toolbox, Create New Terrain section (3.0.2-preview.3)
  • 2000x2000x300 tile with height resolution set to 1025
  • Import height resolution is also 1025
  • I put the raw file directly in the create dialogue instead of adding it after.
• The maximum tile size is 4096x4096 (tested)
  • Common tile sizes are 512x512, 1024x1024, 2048x2048 and 4096x4096

Hoping this helps someone.

 

turn off compression in the inspector

 

This doesn't do anything.

Anybody got a different solution? Every suggestion here doesn't work for me.

 

I am so beyond frustrated with this process. I have tried every single method here and NOTHING is working.

 

Where did you find the documentation?

 

I just got it to work unexpectedly. So I used the inspector to dl a 16bt .raw; then made an empty terrain and imported a raw with the same dimensions rather than using the terrain tool. idk it worked

 

apologies...unfortunately, due to my job, i'm unable to check the forums often.
since this was back in 2020, i think i was probably on Unity 2019.4.
hence, the directions i followed for the import were here :

https://docs.unity3d.com/2019.4/Documentation/Manual/terrain-Heightmaps.html

hope that is of some help.

 

Is there no way to do non-square heightmaps like 4096p by 2048p?

 

This is quite possibly the most frustrating thing i've ever done with Unity, none of these solutions work and I think i'm just gonna have to move on with my project sadly