This generator is used to combine several maps so that their sum is always 1. It could be handy to prepare biome masks:
Input in all of the layers - source non-normalized maps.
Map outputs in all if the layers - input maps processed so that any pixel sum of the map values is equal to 1.
Algorithm: determines the way maps are normalized:
** Sum: for every pixel the generator is calculating sum of all map values. Then each value is divided by that sum. This way all of the layers intensity is scaled proportionally, and no layer has superiority. The layers order does not matter when using Sum algorithm.
** Layers: This generator acts quite similar to the layer blending mode in Photoshop or other graphics editor, and the same way Texture Output textures are blended. Layers are applied from bottom to top, so the top layer is applied without any changes at all.
Normalize Source Maps: Grass, Cliff, Sand
Normalize algorithms: Sum, Layers, Layers (layer order inverted, so 100% filled grass at the top displaces all other maps).
Normalize Generator input maps are stacked using the layers mode. Each layer could be selected by clicking on it. Above the layers you can see the layer control buttons:
Add: will add new layer atop of the selected one.
Remove: removes currently selected layer.
Up: will change the layers order by moving the selected layer up.
Down: will change the layers order by moving the selected layer down.
Each layer has an Opacity value that multiplies layer's map before applying it.