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What is purpose of the blend option in the layer weight node?
The documentation just says it "blends" between the first and second shader.

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It blends the output between all 0 and all 1. This can be most easily observed by plugging the output into an emission shader:

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When used as the mix factor for a mix shader node, it will blend between all of one material or all of the other.

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  • $\begingroup$ so it seems to me that it's equivalent to a mix node. Is that right? $\endgroup$ – Iamisti Oct 4 '18 at 10:23
  • $\begingroup$ @Iamisti In the sense that the blend weight is analogous to the mix factor, yes. $\endgroup$ – gandalf3 Oct 5 '18 at 0:15

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