Terrains, resize Splat Alpha Maps

Unity Engine
1

I was wondering if there is someone who knows how to resize the terrainData SplatAlphaMaps ?
I’ve been trying to export the maps with a simple script, but somehow if I edit it in photoshop, it won’t replace the old splat alpha map, because it isn’t ARGB 32 PNG, which I can’t save with photoshop.

Maybe someone knows a script or way how to resize the terrain alpha maps for splatmaps without resetting the whole texture. I have painted some terrains with a 1025 alpha map for splat textures but want to resize it to 512 without redoing the whole paint job.

Somehow I find that certain tools should be added to the unity default interface when it comes to editing terrains. It’s a pain to paint splat maps from terrain 1 to terrain 2 and make them seamless. Because paiting them with the current toolset, makes painting terrain seamless horrible painfull and time consuming.

Why isn’t the paint tool detecting connected terrains and seamless paint over to the next terrain if you want it to be?
Tools I’m missing are:

  • paint seamless towards other terrains, for heightmap and splatmaps
  • export alpha maps for 3rd party application editing
  • replace alpha maps
  • resize existing terrain data without resetting

But hence my first question, is there a solution?

2

Photoshop should be able to read and write the exr files directly, shouldn`t it?

3

Where are these terrain data splatAlphaMaps Exr files located? I’ve tried to find them without succes.
As far I know, the terrain data doesn’t contain exr file. If it does, I can’t find anything inside Unity that tells me I can export the splatAlphaMap as exr.

Don’t you mean Exr for lightmapping?

4

I guess it isn’t possible to resize the terrains in Unity without resetting the alpha splat maps. Personally I find the terrain system in Unity somehow unfinished. It’s usefull in small scenes, but when dealing with huge landscapes it lack a lot of features. I hope the terrain system will be updated some day.