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The Multi-Mixer node allows you to weigh multiple inputs to create a single output. This is similar to how the Morph Mixer works, but as a node.
The node is available in three versions, Scalar Multi-Mixer (which works with integers as well), Vector Multi-Mixer (which also works with colour connections) and the Material Multi-Mixer.
They all work the same way and only accept different connections.
This is the only output which provides the weighted inputs.
This is the plugin of the month for August 2020, made possible by the finest patrons on Patreon.