Customizing Actors

by Jon (Updated on 2014-01-26)


  • Introduction
  • What is Actor Customization?
  • You can refer to specific Actors/Regions inside a Scene
  • Example: Pressing Switches
  • Caveat: Don't use hidden attributes if you intend to customize an actor.



Sometimes, you'll want to customize the "behavior" of an actor instance in order to make it act a little differently from the norm.

Suppose we’ve got a Goomba for a Mario game. Now, we want to make a Hopping Goomba, but we only want one.

You could do this by creating a brand new Actor Type, copying everything about the regular Goomba, and adding a Jump behavior. But a few too many times and you end up with this...

Is there a better way to go about this? There is. It’s called Actor Customization.

What is Actor Customization?

Actor Customization is a feature that lets you tweak a specific instance of an Actor to behave differently.

To customize an Actor, left-click on it, and then click the Inspector Pane tab on the right hand side of the screen.

Inspector Tab

From there, check "Customize" box in order to change the characteristics of the actor you've selected.

Customize Check Box


What can you customize?

1) Modify an actor’s set of behaviors.
You can add more behaviors or even take some away. You can click the + button in the Inspector to add a Behavior.

Add Behavior Button

Doing so will bring up a dialog that lets you choose a Behavior to add, for example one that lets our Actor jump and run.

Add Jump and Run Behavior

You can also delete a Behavior for an Actor from the Inspector by clicking the X button.

Delete Behavior

2) Modify the values for those behaviors.
For example, suppose that we want a particular Actor to walk really quickly. We could increase the “Minimum Speed” field for the
"Wander" Behavior.

Walking Speed


You can refer to specific Actors and Regions within a scene.

As you may know,  an Actor’s behaviors can’t directly refer to specific objects within a scene. This is why, when you attach a Behavior to an Actor, and that behavior has an Actor attribute, you see this.

Why? Because an Actor’s behaviors are generic, they have no connections to specific scenes. Every Actor behaves the same way, regardless of where it is.

Is there a way to enter values into these fields for Actors? There is! When you customize an actor, you can refer to specific Actors and Regions within a scene. Like this.

I’ll explain how to do this through a common example: pressing switches.


Example: Pressing Switches

Suppose that you're playing an adventure game like Zelda. You're inside a dungeon, and you come across a room with several switches. Stepping on a switch causes a particular door to open.

Download the Project

- Unzip and stick the project into your Games directory as "Switches"

- Don't know where your Games directory is? Click the "View Games Directory" button at the bottom of the Welcome Center (the first screen you see after opening Stencyl)


How can we use Actor Customization to make this work?

In a gist, we want to create a “Switch” behavior that, given a “Door” actor, will tell that Door actor to open up when our Hero steps (collides) on the switch. (The switch should also visually change to a pressed-down state)

Through Actor Customization, we can customize each instance of a switch to open up a particular door when pressed.


(Note: I’m explaining how this works for this scenario. You’ll need to tweak the approach to fit your needs.)

1) Open the “Customizing Actors” project that you downloaded above.

2) Open the main scene.

3) Left-click the left switch, then click the Inspector tab on the right. Click the “Customize” check box in the Inspector.

4) Notice that you now have full control over what behaviors are attached to this particular switch!

Inspector Switch Behavior

5) Click on “Door Actor...” in the Inspector. A dialog will pop up. Choose the left door.

Choose Door

6) Test the game!

7) Finally, configure the other switch to open the other door. Test again.

That's it!

Checking for Understanding

You’ve customized the switch so that when that switch is pressed, the left door opens.

How does this work? Let's take a peek into the "guts" of this sytem. Open up the “Switch Behavior” behavior.

The key piece is the Actor attribute called “Door Actor” - when you customize the Switch actor inside a scene (by double-clicking it), this "Door Actor" attribute lets you pick a SPECIFIC door within the scene to act upon.

If you understand that connection, you fully understand how Actor Customization works.


Caveat: Don't use hidden attributes if you intend to customize an actor.

Readers have reported an issue in which hidden attributes are problematic when you attempt to customize an actor. For the time being, it is best to adhere to this limitation until the issue is fixed. 


  • Use Actor Customization to tweak the behavior of actors rather than creating brand new ones.
  • Actor Customization lets you modify the attached set of behaviors and modify each behavior’s values, for a particular instance of an Actor within a scene.
  • You can refer to specific Actors and Regions within a scene through Actor Customization.
Disclaimer: All articles are geared towards Stencyl 3.0 and above. Use comments to provide feedback and point out issues with the article (typo, wrong info, etc.). If you're seeking help for your game, please ask a question on the forums. Thanks!


Using 3.1.0 b7305 .
Got the example file going by adding actor-actor events under the 'main' scene.
That gave me a graphic to click the specific actor and brings up the 'when actor hits actor code wrapper.

0 1 year, 1 month ago
Our apologies for the broken materials. Stencylpedia is has become quite a challenge maintain, and this is why we don't supply more sample games - because a broken sample game is worse than none at all. We'll figure out a better system to handle this in the future.
0 1 year, 7 months ago
Does anyone know how to make it so that an actor will fire projectiles towards the player as of them entering a certain region?
0 1 year, 10 months ago
Why is it these tutorials always contain incomplete assets? :(
0 1 year, 11 months ago
i cant figure out how to delete an actor from a scene.
0 2 years, 6 months ago
It is possible to get this to work. It seems like it's just the 'Switch Behaviour' that's missing.

Steps to create it are:

Create an Actor Behaviour called 'Switch Behaviour'
Add an Attribute to it of type Actor called 'Door Actor'
Add an Event Collisions->Actor of Type
Add the red (above) 'trigger event ' block (from Behaviour->Triggers palette)
Type text 'open' and select attribute 'Door Actor' as above (except it's in red not blue)
Add the blue (above) 'switch animation to' block (from Actor->Draw palette)
Type text 'off' instead of the blue 'Pressed State' above
Save and go over to the Switch Actor and add the Switch Behaviour

Now you should be able to go to the Scene and do the customising as above and get the correct result when you run it.

1 2 years, 10 months ago
Please note that all of this is invalid now and doesn't work sadly.
0 2 years, 10 months ago
Also, the customizable attributes must not be Hidden (right?)

Could not follow the Switches example because the download seems to be missing some behaviours, more detailed bug report here:
http://community.stencyl.com/index. php/topic,11810.0.html

0 3 years, 2 months ago
Also you need to check the little white box next to Customize for anything useful to show up.
0 3 years, 2 months ago
Please upload a “Customizing Actors” project.

0 3 years, 2 months ago

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