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IR Terrain Fantasy295 version - Compatible

I checked Shogunate again, the white area uses the texture of mountain_02_c, so you also need to replace mountain_02_c, not just mountain_02_d.
In the terrain folder there is a file called "山高.txt" which contains the altitude divisions for textures I derived from vanilla ck3. mountain_02_c is higher than mountain_02_d, in vanilla it usually appears in impassable mountain, such as the impassable areas of the Alps, while mountain_02_d appears in passable areas.
In addition, in order to avoid this mod update overwriting your changes, you can create a new mod and keep your changes here

Actually, I'm not sure what changing these values ​​will do, since I'm mainly modifying the terrain folder for this mod, and the rest of the files are from the original IR Terrain.
But if you want to get rid of the white rock, you can replace the mid-altitude textures with the low-altitude ones: replace mountain_02_d with mountain_02_b in the terrain folder.
If you want to tone down the brightness of the white rock, you can adjust mountain_02_d_diffuse.dds using the NVIDIA Texture Tools Exporter.
Or another way is to modify the Shogunate map file to make the mountain textures alternate.

Ah I see. The problem with shogunate is the map is full of mountains, lots of it. This mod works well with elder king and other mod, but with the shogunate map desing (lots of high ground) make it insanely bright. Just quick question, is it okay to modify or remove bright_threshold in posteffect_volumes.txt from the mod?

That's as design. The high altitude is snow, the middle altitude is white rock, and the low altitude is vegetation and soil.

The map is too bright if used with Shogunate in some area, thus made the texture sometimes full white in med+ map height, is there something I can tweak to fix this issue?

I removed the wave effect to make the mod compatible with the mods that expand the map