02 — Quick Start¶

This example turns the distance to a target into a smooth aggression level.

1. Create a Data Asset¶

In the Content Browser, choose Add → Miscellaneous → Data Asset, then the Fuzzy System class. Name the asset DA_EnemyBehavior and open it.

2. Add an Input¶

In Inputs, create an entry:

Field	Value
`Name`	`Distance`
`Range.Min`	`0`
`Range.Max`	`2000`
`Default Value`	`1000`

Add three sets:

Set	Shape	Parameters
`Near`	Trapezoid	`0, 0, 300, 700`
`Mid`	Triangle	`400, 900, 1400`
`Far`	Trapezoid	`1100, 1500, 2000, 2000`

3. Add an Output¶

In Outputs, create Aggression with range 0…1. Add:

Set	Shape	Parameters
`Cautious`	Triangle	`0, 0.15, 0.55`
`Watchful`	Triangle	`0.25, 0.5, 0.75`
`Aggressive`	Triangle	`0.5, 0.9, 1`

4. Write the Rules¶

Add to Rules:

IF Distance IS Near THEN Aggression IS Aggressive
IF Distance IS Mid THEN Aggression IS Watchful
IF Distance IS Far THEN Aggression IS Cautious

Save the asset. The Compile Log should report that the system compiled successfully.

5. Check the Result¶

On the Inference tab, change Distance in the left panel. The Aggression card on the right shows:

the current crisp value;
the output sets as faint colored lines;
the aggregated area;
a white marker for the defuzzified result.

The bottom panel shows which rules fired and with what strength. Preview values are temporary and don't change the Default Value in the Data Asset.

6. Use It in Blueprint¶

Add a Fuzzy Logic component to an actor.
Set System Asset = DA_EnemyBehavior.
Before making a decision, call Set Input:
Variable Name = Distance;
Value = distance to target.
Call Evaluate Output:
Output Variable Name = Aggression;
store the returned number.
Use the number for speed, attack weight, animation selection, or another smooth parameter.

Set Input persists the value between evaluations. If only the distance changed, you don't need to set the other inputs again.

7. Transfer the System via JSON¶

In the editor toolbar, click Save To JSON. To create another Data Asset from the same preset, open it and click Load Preset. Importing validates the entire document first; a failed load doesn't change the asset.

The next section explains the data model: 03 — Core Concepts.