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I want to add two Principled BSDF in one material to one as texture 1 and principles for logo only with transparency to control roughness.

enter image description here

enter image description here

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enter image description here

If I understood your question, you have to combine two different materials into one, using the alpha channel to mix between the two shaders.

In my example I created a material for all the faces except the zone of the logo, then duplicated it, assigned the dupli version to the faces of the logo zone, then added in the dupli version a new principled shader, with the image as base color.

Then I used alpha channel to mix between the two shaders.

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  • $\begingroup$ OMG, it's working perfectly as I want, thank you so much~ $\endgroup$
    – Elkazi
    Jan 19, 2020 at 17:28

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