Landscape Material: What is Blend Modulation?

Development Rendering
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Hi Epic Games and Staff,

i have a little question about your LandscapeMountains Project.

I have found analysed a lot for understanding, but there is a little piece that i do not understand.

What is Blend Modulation? I know it is a generated Alpha Map from the Texture, but i do not know the usage.

I also saw that it is not used in the project, but it is there.

Here is a picture of the function:

101987-mat01.jpg
101987-mat01.jpg1358×846 112 KB

Thanks in advance.

Sincerely yours

raidfire.net

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Blend modulation commonly refers to refining transition from texture to another by using a mask.