Create a Condition Node

Condition Nodes can be used to conditionally direct users down different dialogue branches or even conditionally render options. They are designed to be infinitely nested in theory and you can find all sorts of Dialogue Sequence examples in the Parley examples folder.

Prerequisites#

• Ensure you have familiarised yourself with the Condition Node docs.
• Parley is installed and running in your Godot Editor.
• You have followed the instructions to add the relevant facts to the system.
• You have created a basic Dialogue Sequence before. Consult the Getting Started guide for more info.

Instructions#

1. Create a Condition Node using the Insert dropdown.
2. Click on the created Condition Node in the graph view to open up the Condition Node Editor.
3. Enter a high-level descriptive name for what the Condition Node represents. This is because it can be sometimes hard to work out what conditions are doing so the more info you can provide up front the better! In this example, we write: Alice gave coffee.
4. Now choose a Combiner for all of your conditions. Here we will choose All which means that all of the conditions have to pass in order for the Condition Node to be true.
5. Next up is to define the conditions for the Combiner. Click Add Condition. During the running of a Dialogue Sequence, each condition will be evaluated in turn and sent to the Combiner to calculate whether the Condition Node is truthy (or not). Note, you create more than one condition for the Combiner.
6. Select a Fact using the dropdown. In this case, we will select the Alice gave coffee Fact. Facts are manually defined scripts that execute when a condition is evaluated and return a value to be checked later in the condition.

Tip

You can click on the pencil icon to the right of the Fact to view the selected Fact in the Godot GDScript Editor and optionally edit it.

7. Next, choose an Operator. Here, we will use the Equal Operator. This will be used to compare the result of the Fact against a defined value (coming next!).
8. Finally, choose a value to compare with. Here we set the value to true. Please note, Parley does perform a basic level of coercion so in this case, this will be a GDScript bool.
9. Click the Save button in the Parley Editor and there we have it! Our first Condition Node. Now connect this Node up with other Nodes (here, we define a basic setup for each possible input and output of the Condition Node).
10. You can test out your Dialogue Sequence by clicking the Test Dialogue Sequence From Start Button.