# GraphParameter<no value>

{{< image-center
    src="images/2_DevMode/vfx_editor/nodes/graphparameter_1.png"
    alt="The GraphParameter Node" >}}

This **Node** can be used to retrieve the value of a [Model Behavior](../../../content-configuration/models/modelbehaviors/model-behaviors/) parameter, which in itself can contain [RPN](../../../programming-apis/reverse-polish-notation/) to permit calculations to be used within the effect. When adding this node the **Inspector** will look like this:

![The GraphParameter Inspector Window](images/2_DevMode/vfx_editor/nodes/graphparameter_2.png)The options here are:

-   **GraphParamName**: This is the name of the Model Behavior parameter to retrieve the value from.
-   **GraphParamDefaultValue**: This sets a default parameter value that will be returned should there be any issue retrieving the named parameter.

 

You can also find an example of how the model behaviors should be set up to correctly define a parameter for use in this node on the following page:

-   [Example Using Graph Parameters](../../../content-configuration/visualeffects/visual-effects-xml-examples/#graph_params)

 

 

### Node Inputs

The GraphParameter node permits the following input:

 

-   ##### GraphParamDefaultValue

    This input will overide the value set in the node Inspector and will be used should there be an issue retrieving the given parameter name.

 

 

### Node Output

The node will output either the default value (from the node itself or from the node input) or the value returned by the given the parameter name, calculated by the Model Behavior.