How do I blend landscape textures based on world height / heightmap values?

And here’s how it currently looks with my angle-calculations added to the blend. Hopefully this isn’t just beneficial to me, but to everybody having the same problem.

Note: this can also be made into entire biome “Layers” For example, I want a temperate layer, and a desert layer, and painting them dynamically textures the terrain according to pre-defined parameters.

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