Any way to import / export light splat maps?

Unity Engine
1

This has been asked several times, but never answered… sooooo, any way to do it?

2

Yes, it’s quite doable. In the island demo there is a custom script to duplicate textures. This can be used to export splat/lightmap textures. You can set the lightmap in project view for terrains. I didn’t find import script for splatmaps in final island demo.

Here’s code(I think it’s originally written by OTEE) for overwriting texture(works with splatmaps). Put this one to Asset/Editor folder.

@MenuItem("Assets/Overwrite Texture")
static function Apply () {
	
	var texture : Texture2D = Selection.activeObject as Texture2D;
	if (texture == null)
	{
		EditorUtility.DisplayDialog("Select Texture", "You Must Select a Texture first!", "Ok");
		return;
	}
	
	var path = EditorUtility.OpenFilePanel("Overwrite with png", "", "png");
	if (path.Length != 0)
	{
		var www = new WWW ("file:// " + path);
		while (![url]www.isDone[/url])
			;
		www.LoadImageIntoTexture(texture);
	}
}
3

Thanks Phantom, I didn’t know about that script.

Anyone know of any way to import these maps? It would be very useful to be able to “tweak” these in a paint app or allow an off-site artist to create them.

4

Thanks Phantom. Is there a default editor script folder so I can reuse these scripts in other projects?

5

Btw. if you only want to assign a custom lightmap you can simply drag it onto the lightmap slot in the terrain data asset in the project view. (Select it in the inspector)

6

Thanks Joe!

7

This doesn’t seem to be working for me in 2.0.2 – did something change or am I not dragging the right thing to the right slot?

  1. I have a new lightmap image in PNG format. I set its import settings to ARGB 32 bit, and it is the same pixel dimensions as the lightmap in my terrain.

  2. I have twirled down the terrain object in the Project view so I can see the lightmap element.

  3. I try to drag my external lightmap image onto the lightmap element in the terrain.

  4. Nothing happens – the lightmap is not replaced.

Is there something about the format of external file? Or am I dragging to the wrong spot? Or?

I’d love to be able to do this to burn tree shadows into the lightmap.

Thanks,
Steve

8

Update:

This works just fine.

I failed to look at the inspector after selecting the terrain object in the project view. You can easily swap the lightmap there.

One thing that might seem a bit confusing is that the Terrain Object’s hierarchy will still show the generated lightmap and not the one you swapped in.