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I have a .obj mesh loaded with given UV coordinates. I'd like to color the mesh using its UV coordinates, similarly to this image. I think the correct way is to first compute a scalar out of the uv coordinates, something like u*v, and then connect that scalar to the hue value of a HSV node. Thing is, I don't know which module can I use to take the UV Map's output and turn it into a scalar.

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You can get the UV coordinates from a Texture Coordinates or from an Attribute Node, separate the three components of the vector using a Separate RGB node, and use this to map colors to your BSDF.

Colors from UVs node setup

Colors from UVs result

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  • $\begingroup$ Suggest you remove the muted node from the screenshot, in case it confuses anyone $\endgroup$ – Greg Zaal Jul 3 '14 at 14:00
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    $\begingroup$ I left it intentionally, because OP wanted to multiply the U and V coordinates together, but I muted it because it looked like it wasn't needed to reproduce the reference picture. $\endgroup$ – Pisurquatre Jul 3 '14 at 14:49

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