How do I enter trace_set on the MAYA GUI?

[yoshitomop]

It is about MAYA 2018. I would like to use the function of "trace_set", but even if I enter it into the visibility of MAYA 's shape attributes it will not be reflected in the shader well. Please tell me how to enter the correct data.

[Stephen.Blair]

There's no trace_set shader exposed in Maya, so setting trace sets on objects won't do anything.

Shaders like Standard Surface don't support trace sets.

[yoshitomop]

Thank you for answering.

Sorry, my question was short of explanation. I am creating a custom shader that works with mtoa. So, I'd like to use "trace_set" to output AOV that passes a specific shape with my shader.

The shader can create it by looking at the tutorial, but I asked because I do not know how to properly set "trace_set" data in MAYA's AttributesEditor.

If there is a person who understands please tell me.

[Stephen.Blair · Accepted solution]

kick -info polymesh.trace_sets
node: polymesh
param: trace_sets
type: STRING[]
default: (empty)

The trace_sets parameter is just an array of strings.

If you want shapes to be in the same trace set, then you put the same string (eg "refl") in the trace_sets parameter of each shape.

[yoshitomop]

@Stephen Blair

Thank you Stephen.

I did not know how to use kick. By checking the data entered in AttributesEditor of MAYA with kick, we found out the correct data setting method.

Thanks "trace_set" is functioning without problems.

Again, thank you for answering.