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Despite the similarity in the names, the landscape layer type is not a technical requirement for the blending method used in the actual material. Once painted (or imported) both types of layers contain weighting information that’s treated in the exact same way in the material.
The layer type controls how the weights are added or removed WHEN PAINTING, and the blend type controls how those weights affect the layer blending in the material.
Certain combinations were clearly intended by epic to be used together more often than others, hence the confusion. -
No - as the docs state, even with all your landscape layers set to ‘weighted(normal)’, you probably want at least one layer in your material blend set to ‘alpha’ to avoid certain artifacts
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Likely yes, though this isn’t a technical limitation - more of a recommended workflow to prevent painting landscapes being annoying / frustrating / difficult to control. If you set up your landscape like this, you won’t take into account the height of the other layers when blending in the puddles, which you might want, so it’s not a rule.
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Again, likely yes, depending on your use case - you probably don’t want this layer to remove weights from other landscape layers when painting.
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