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3Danua
Participant
August 31, 2021
Question

Accurate metalness values for complex materials

  • August 31, 2021
  • 1 reply
  • 248 views

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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1 reply

3
3DanuaAuthor
Participant
September 1, 2021

anyone?

davescm
Community Expert
davescmCommunity Expert
Community Expert
September 1, 2021

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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