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SHADERSOURCE.IO

INSERT ALPHA CHANNEL
This will cover how to insert alpha masks into your textures using the Insert Alpha Channel Tool
This tool is technically obsoleted by the channel packer, however this is a lot more simple for quick adding alpha masks to textures.

Input your Base and Alpha Mask Textures, you can then select which channel to use from the Alpha Mask texture to insert into the alpha channel of the base texture. Here is an example.

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