Duplicate active sun found, it will be ignored
This message occurs when there is more than one CoronaSun light present in the scene. Corona will only render first sun object, and ignore any other ones. This is to prevent unexpected behavior in connection between CoronaSun and CoronaSky.
More than one CoronaSun objects present in scene.
- Make sure there is only one CoronaSun object in your scene
- If your scene requires more suns, use 3ds Max standard Free or Target Direct light with shadows set to CoronaShadows