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I have a couple of normal maps that have a additional bump map inside the alpha channel, is there a map similar that allows me to basically disable that channel that works inside MaxtoA's GPU Beta?
With Arnold CPU you can simply use the color correction legacy map which allows you to set specific channels to zero but that one is not supported by the GPU beta.
Can't you use the Arnold color correct node? And multiple by 0 the channels you don't want?