Normalised roughness maps for vfx workflow

Fredrum

Hi I'm looking into how to use this awesome paint software in a vfx style pipeline and was wondering about how I can export roughness maps that are closer to a 0-1 range than the values set inside Substance?

Reason is that the painter values will need to be somewhat changed when tweaking and re-tweaking the (eg renderman) shaders and then having 0-1 textures is much more preferrable.

Ideally the program could normalize the map at export time together with some values that let you mathematically re-map the texture into what was used in Substance. I could then script the importing of the textures to add this back in.

Does anyone know what Substance has for options for a workflow similar to this?

Cheers, F 

sprunghunt

You can setup custom nodes for painter using substance designer - this is how all the proceedural nodes and textures in substance designer are made. You export a SBSAR file from designer and put it in the shelf in painter. 

There is already an 'auto levels' node in substance designer that basically does this. 

poopipe

 You can't exactly apply a post process at export time in Painter sadly.  
I get around this issue by using extra channels so I can still see good values in Painter while I work

Eg. 

Add a channel called normalised_roughness
Use an anchor point to collect your roughness values from the roughness channel and pipe it into the normalised_roughness channel of a new layer, apply an auto levels filter to that channel and 
Then remember to add the channel to your export preset.

Hope that makes sense