Understanding PBR a bit more

theSixtyEight · May 2015

Hey guys,
first time I was trying to understand metalness PBR workflow.
As said on marmoset toolbag website , "The metalness workflow on the other hand, uses the albedo map to define both the diffuse and reflectivity content"
however when I apply albedo to my model in Toolbag2, the speculars doesnt change at all while changing albedo. Is this normal behavior or am I doing something wrong?

radiancef0rge · May 2015

Can you post your metal mask

theSixtyEight · May 2015

i currently have only black color assigned to the metalness map of wood material

theSixtyEight · May 2015

edit, does anyone know, if all non-conductors have same strenght of spec? is that correct?

huffer · May 2015

In the metalness workflow, yes. Albedo controls diffuse and reflectivity as in whatevers corresponding white in metalness will get a constant black diffuse color and the reflectivity value from the albedo, whats black in metalness pulls diffuse from albedo and a constant reflectivity value of 0.04 linear rgb (or ~55 %gray in srgb).

AdvisableRobin · May 2015

In reality no, all non-conductors don't have the same spec, but the metalness workflow assumes a value of 0.04 because that is the closest average that non-conductors share.

Post up pictures of your maps if you could.

theSixtyEight · May 2015

Thank you good people of polycount

I guess I understand now the whole metalness haha

I dont have maps yet I was just experimenting with basic values in Marmoset

EarthQuake · May 2015

Change your metalness to 1 and then adjust the albedo, you'll get an idea of it works then. When metalness is set to 0, all materials are insulators, so the albedo only affects the diffuse color.

Understanding PBR a bit more

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