OsSetTerrainTextures

• textures for legacy viewers and map if types == 0 or 2
• textures for new viewers if types == 1 or 2
• PBR materials for new viewers if types == 1
  

The list textureKeys must contain keys or names of 4 textures or pbr materials. They must be of the same type, either texture or material due to viewers restrictions. If the entry is a name, then the material or texture must be present on the prim inventory.