82 lines
4 KiB
Markdown
82 lines
4 KiB
Markdown
# Add relations to a Custom C# node
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> [!NOTE]
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> To add logic to a node, you must create a Custom C# node and add ports. [!include[vs-tasks-note-end](./snippets/custom-c-nodes/vs-tasks-note-end.md)]
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After you [add ports](vs-create-custom-node-add-ports.md) and [add logic](vs-create-custom-node-add-logic.md) to a node, relations help Visual Scripting correctly display a Custom C# node in a Script Graph.
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To add relations to a node:
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1. [!include[open-project-window](./snippets/vs-open-project-window.md)]
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2. [!include[open-existing-external-code](./snippets/vs-open-existing-external-code.md)]
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3. In your external editor, add relations in the format `$RelationType$($Port1$, $Port2$)`, where `$RelationType$` is the relation type you want to assign between the ports you specify as `$Port1$` or `$Port2$`.
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For example, to assign relations to the previous example node:
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```C#
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using System;
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using Unity.VisualScripting;
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using UnityEngine;
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public class MyNode : Unit
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{
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[DoNotSerialize]
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public ControlInput inputTrigger;
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[DoNotSerialize]
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public ControlOutput outputTrigger;
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[DoNotSerialize]
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public ValueInput myValueA;
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[DoNotSerialize]
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public ValueInput myValueB;
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[DoNotSerialize]
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public ValueOutput result;
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private string resultValue;
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protected override void Definition()
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{
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inputTrigger = ControlInput("inputTrigger", (flow) =>
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{
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resultValue = flow.GetValue<string>(myValueA) + flow.GetValue<string>(myValueB) + "!!!";
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return outputTrigger;
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});
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outputTrigger = ControlOutput("outputTrigger");
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myValueA = ValueInput<string>("myValueA", "Hello ");
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myValueB = ValueInput<string>("myValueB", String.Empty);
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result = ValueOutput<string>("result", (flow) => resultValue);
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Requirement(myValueA, inputTrigger); //Specifies that we need the myValueA value to be set before the node can run.
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Requirement(myValueB, inputTrigger); //Specifies that we need the myValueB value to be set before the node can run.
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Succession(inputTrigger, outputTrigger); //Specifies that the input trigger port's input exits at the output trigger port. Not setting your succession also dims connected nodes, but the execution still completes.
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Assignment(inputTrigger,result);//Specifies that data is written to the result string output when the inputTrigger is triggered.
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}
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}
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```
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For more information on relation types, see [Custom C# nodes](vs-create-custom-node.md#relation-types).
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4. [!include[save-script](./snippets/vs-save-script.md)]
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1. [!include[return-unity](./snippets/vs-return-unity.md)]
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5. Do one of the following:
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- [!include[open-graph-w-node](./snippets/custom-c-nodes/vs-open-graph-w-node.md)].
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- [!include[ff-add-node](./snippets/custom-c-nodes/vs-ff-add-node.md)]
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6. In the [Graph toolbar](vs-interface-overview.md#the-graph-toolbar), enable **Relations**.
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Visual Scripting displays the relations you assigned to the Custom C# node. If you used the previous code sample, the node's relations might look like the following image:
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## Next steps
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After you add relations to a node, you can choose to [add documentation](vs-create-custom-node-add-docs.md) or [customize the node with attributes](vs-create-custom-node-attributes-reference.md).
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