Extract MetalRoughness map to metal map and roughness map?

Hi there,

I have a question, I hope it is the right place, I am starting to work with PBR and for this I have started working with the Damaged Helmet model ( https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/DamagedHelmet ).

And my question is, in all the tutorial i have been able to read they speak of metal and roughness as separate textures maps.

In this case I only have a unique texture for metal and roughness.

Is there any way for this texture to extract the roughness map and the metal map?

“The metalness values are sampled from the B channel. The roughness values are sampled from the G channel.”

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