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# Node Parameters and Interface Controls

The node parameters and interface controls are found in the Material Interface of the NetworkMaterialCreate and NetworkMaterialEdit nodes. These controls can be used to customize various shading node parameters that you may want to be accessible from outside Network Material nodes. The controls can be used to provide an artist-friendly set of parameters, established inside Network Material nodes, presented outside as an interface for controlling certain aspects without being exposed to all of the parameters. This can be beneficial as it allows the artist to focus only on the necessary parameters and make quick alterations without having to enter their Network Material nodes.

Promoted parameters in a NetworkMaterialCreate Parameters tab

Note: The examples on this page demonstrate promoting and customizing the material interface in the context of a NetworkMaterialCreate node. All these steps are reproducible when working with NetworkMaterialEdit.

# Adding Custom Parameters to the Material Interface

Network Materials can contain any number of nodes and opening the group to access node parameters is time consuming. If you know that some node parameters are used often, you can expose those internal node parameters on the parent NetworkMaterialCreate's Parameters tab for ease of access. You can promote parameters from any shading node within your NetworkMaterialCreate node, including those within ShadingGroups.

Note: The examples on this page demonstrate promoting and customizing the Material interface in the context of a NetworkMaterialCreate node. All these steps are reproducible when working with NetworkMaterialEdit, and there are no differences in workflows between the two nodes.

### To promote parameters quickly with the default Name, Page, and Label:

1. Click the NetworkMaterialCreate node's expand button to display the nodes inside.

2. Double-click the node that contains the parameters you want to expose, or press the E keyboard shortcut.

Tip: If the source node is in a ShadingGroup, click the ShadingGroup node's expand button to display the nodes inside and then double-click the node that contains the parameters you want to expose..

The node's Parameters tab opens.

3. Click the wrench icon to the right of the parameter you want to expose and select Add to Material Interface.

The wrench turns yellow to indicate that the parameter is added to the Material Interface.

4. Open the Parameters for your NetworkMaterialCreate node to see your promoted parameters.

5. Click the wrench and select Remove from Material Interface to remove an exposed parameter.
6. Click the green arrow next to a parameter to open its source node's Parameters.

Editing a parameter in the Material Interface or the source node updates both, so your nodes and NetworkMaterial are always synchronized.

### To promote a parameter and customize its appearance:

1. Bring up the Parameters of your shading node by setting the edit flag.
2. Click on the Edit Parameter wrench icon on the right-hand side of the parameter you would like to promote.
3. Choose Edit Material Interface Options from the dropdown menu.

The Material Interface Options dialog is displayed.

4. In the dialog box, enter the name you would like to give to the parameter in the Name field.
5. You can use the Page and Label fields to customize the appearance of the parameter.

   • Page - creates a subsection in the Parameters tab and places the new parameter in that subsection. If you leave Page blank, the new parameter is added directly to the Parameters tab.

   • Label - specifies the label describing the new parameter.

   Tip: Pages appear as dropdowns in the Parameters tab. To create a page within a page, put a full stop between the two names. For example, Base Layer.Diffuse and Subsurface creates a page called Base Layer and a subsection called Diffuse and Subsurface.

6. Click OK to finish editing.
7. Open the Parameters for your NetworkMaterialCreate node to see your promoted parameters.

8. Click the wrench and select Remove from Material Interface to remove an exposed parameter.
9. Click the green arrow next to a parameter to open its source node's Parameters.

Editing a parameter in the Material Interface or the source node updates both, so your nodes and NetworkMaterial are always synchronized.

## Adding Prefixes to Custom Parameters from ShadingGroups

Promoting parameters from inside a ShadingGroup to the Material Interface allows you to add prefixes to parameters' page and name. This allows you to group parameters quickly without drilling down into the ShadingGroup to change the page and name of promoted parameters manually.

Note: The parameter name is its scripting reference, not its label in the Material Interface.

To add a prefix to promoted parameters:

1. Open the Parameters for your ShadingGroup node.

2. Click the publicInterface dropdown to open the prefix panel.

3. Enter the required prefixes in the available fields:

• namePrefix - adds a prefix to the promoted parameter's name. This is the parameter's scripting reference, not its label in the Material Interface.

• pagePrefix - adds a prefix to the page name visible in the Material Interface.

For example:

4. Open the NetworkMaterialCreate node's Parameters.

The promoted parameters are prefixed as described.

Note: The name prefix is only displayed when you hover over a parameter.

# Adding Visibility and Lock Constraints to Parameters

The Visibility & Locking tab uses a GroupStack node that automatically sets the type to NetworkMaterialInterfaceControls. It can manage any number of controls from within the parameters of a NetworkMaterialCreate node.

Visibility & Locking allows you to lock or hide promoted parameters so they cannot be changed under certain conditions. The conditions depend on the operator and the value of another promoted parameter. You can add multiple conditions and operators to customize the public parameter interface exactly as you need.

In this example, a control has been set up that causes the parameter Displacement.Scale to lock on the condition that the value of the parameter Dlprincipled.Bump.Intensity is equal to 0.5.

The result of a lock on the promoted parameters

To create a new Network Material lock or visibility constraint:

1. Open the Parameters for your NetworkMaterialCreate node.
2. Click the Visibility & Locking tab.
3. Click the Add button to create a new control.

   Note: For information about each parameter, see NetworkMaterialInterfaceControls.

# Changing the Order of Promoted Parameters

Promoted parameters can be rearranged in whatever order you like. For example, you might want to position more commonly used parameters at the top of the Parameters tab or organize parameters alphabetically. Promoted parameters are listed in the order they appear on the Sources & Order tab.

Default parameter order in the Parameters tab
The same parameters in the Sources & Order tab

To change the order of parameters:

1. Click the Sources & Order tab in the Material Interface.

2. Click the dropdown to display the parameters hidden in pages, if required.

3. Middle-mouse click and drag to rearrange the order of the parameters. A white line highlights the parameter's new position as a guide.

Tip: You can drag and drop entire pages or single parameters, but parameters within pages can only be reordered within the page.

The Parameters tab updates to reflect the changes you made to ordering.

# Using Custom User Interfaces With the NetworkMaterialEdit Node

When referencing an upstream material in a NetworkMaterialEdit for the first time, you must repopulate the NetworkMaterialEdit. Repopulating the NetworkMaterialEdit node generates any inherited shading networks and any promoted user parameters present in your upstream materials.

To repopulate a NetworkMaterialEdit node, either:

- Enable the NetworkMaterialEdit node’s parameter flag from the nodegraph, or
- If the NetworkMaterialEdit node is already open in the Parameters tab, click the Repopulate NetworkMaterialEdit button.

Repopulating generates the shading network and the material interface is inherited from the material upstream.

If the contents of the upstream reference material are updated, you are prompted to refresh the contents of the NetworkMaterialEdit in the node’s parameters.

Click Refresh NetworkMaterialEdit to include changes made in the referenced upstream material.

Tip: For more information on working with NetworkMaterialEdit, see Editing Materials With The NetworkMaterialEdit Node.