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I am trying to do a material study, and I would like to print the Principled BDSF values onto the render.

Previously I had found this: How to show render-stamp for arbitrary values?

It had worked, but the data path I get when I right click the roughness parameter for the Principled BDSF is: nodes["Principled BSDF"].inputs[7].default_value

That doesn't seem to work the same way.

here is the script:

 import bpy def stamp_set(scene): note = "Samples: " + str(scene.cycles.samples) note += ", Bounces, Max: " + str(scene.cycles.max_bounces) note += ", roughness: " + str(nodes["Principled BSDF"].inputs[7].default_value) note += ", Version: " + bpy.app.version_string scene.render.stamp_note_text = note bpy.app.handlers.render_pre.append(stamp_set)

I also tried, cycles.nodes["Principled BSDF"].inputs[7].default_value

and

scene.nodes["Principled BSDF"].inputs[7].default_value

I get an error in the terminal that these are undefined (I think).

SO, how would I go about doing this?

thanks,

eh five

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  • $\begingroup$ I can't really tell, does this help? blender.stackexchange.com/questions/101929/… $\endgroup$ Commented Oct 20, 2018 at 16:21
  • $\begingroup$ I can't tell either, although the links in those questions did seem in the right direction. $\endgroup$ Commented Oct 20, 2018 at 20:13

1 Answer 1

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I found a solution with various references. The big thing that helped was finding how to enter the value for a Principled BSDF parameter in the console;

bpy.data.materials['Material'].node_tree.nodes["Principled BSDF"].inputs[1].default_value = 3

Mostly from here:

Change value of material emission strength from Python console or script

The final script looks like this (input 7 is Roughness):

import bpy def stamp_set(scene): note = "Samples: " + str(scene.cycles.samples) note += ", Bounces, Max: " + str(scene.cycles.max_bounces) note += ", Roughness: " + str(round(bpy.data.materials['Material'].node_tree.nodes["Principled BSDF"].inputs[7].default_value, 3)) note += ", Version: " + bpy.app.version_string scene.render.stamp_note_text = note bpy.app.handlers.render_pre.append(stamp_set)

ref:

Editing Lamp Strength with Python

Change value of sun light emission strength from Python console or script

decreasing excess precision:

How to show render-stamp for arbitrary values?

-snaok

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