Yes, the “Generate Filters” button is the initializer for generating landcovers/splatmaps, we had to have it as a separate button in order to select between automatic and manual setup modes and then generate filters using this button, it will setup needed parameters before generating the landcover file. This post is a comprehensive tutorial on how current MapsMaker work: https://discussions.unity.com/t/611457 page-5#post-2956710