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Accurate metalness values for complex materials

New Here ,
Aug 31, 2021 Aug 31, 2021

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Hello all, I've struggling with complex materials such as plastic painted with metallic paint(with granules of metall), blued steel, parkerized iron, black iron, casted iron, blacked metalls. Overheated metalls. 

I think this kind of materials should have values in between of 0 and 1,but I don't what correct values it would. I try to guess it by eyes, maybe there is something like a chart for this types of materials? 

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New Here ,
Aug 31, 2021 Aug 31, 2021

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anyone?

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Adobe Community Professional ,
Sep 01, 2021 Sep 01, 2021

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I've never seen such a chart.
There have been discussions on Polycount but nothing as conclusive as for x use y. With some of those burnt materials lowering metallness along with taking the reflectance in the base colour map down at the same time seems to yield a convincing result. But it seems to be "tweak it till it looks right" rather than a hard science approach, which is understandable as rendering is an, albeit science based, approximation.

 

For metallic paint you might want to look at an approach using a shader that allows a coating so a layer with a dielectric base paint. A layer with metal particles with variations in height and angle and a layer with a clear coating.

 

Dave

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