This short tutorial will cover how to use the set_parameter, collection, and disable operators to change the lights and self-shadowing of some teapots and alter the shading of the sphere. The scene contains two lights casting shadows on three teapots and a sphere with a simple utility shader assigned to it.

Use the Ignore Operators flag in Diagnostics> Feature Overrides to check what the render looks like without any operators.

The scene file can be downloaded here.

 

Collection

We will use the Collection operator to reference a selection. This can be used to avoid writing a selection multiple times (optional in this case).

  • Create a Collection Operator containing two teapots. Under Selection add the following (we will apply a Set Parameter that will only affect these two teapots):

Teapot Collection

 

Set Parameter (Disable Self Shadows on the Teapots)

  • Create a Set Parameter. Create the following expression:

self_shadows=false

 

Disable Light

We can turn off one of the lights by using the Disable operator.

  • Create a Disable operator and under Selection enter for the following Arnold light:

Arnold quad.light.1 (drag & drop the light node)

Arnold quad light 1 disabled

 

Set Parameter: Sphere Utility Shader

Now we will change the Overlay Mode for the spheres Utility shader.

  • Assign a Utility shader to the sphere and rename it to the_utility.
  • Create another Set Parameter and under Expression enter the following:

overlay_mode="wire"

  • Under Selection enter the following:

Utility shader altered with Set Parameter

 

 

Final Operator Graph window setup

 

 

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