Connect UI3 To External Blueprints

How to connect to other blueprints that are not part of the UI3 project.

The SDotUI3_CharacterV3 is already connected to the blueprint interface BPI_UI3_Interaction. You can find it in

ArchVizUI_V3 -> UI -> Etc.

Here are the steps how to connect the blueprint interface using the character as the example:

1. Click on the Class Settings in the top menu row next to the blue marked Class Defaults
2. Click on Add in the Implemented Interfaces section in the Details panel. Select the blueprint interface BPI_UI3_Interaction.
3. There might be more than one interface with that name. You need to choose the one in the ArchVizUI3 folder. All blueprints must have the exact same blueprint interface. To check the location of the selected interface click on the folder next to its name.

1. Click on the folder icon to navigate to its location in the Content Browser
2. Check the location is in the directory ArchVizUI_V3 / UI / Etc

If it's not in this directory you have to go back to the blueprint and add the other interface with the same name. Check again until you are sure the correct interface has been added.

Unfortunately I added an interface with the same name into some of my other products. I didn't really understand how they work, sorry.

• The Variation Names
• A unique Tag name to identify the target blueprint
• Call Interface needs to be ticked

The Variation Actor has no other duties, no meshes in the scene needs to be changed. With no meshes connected there needs to be a clickable area to activate the actor.

• Click the box Parent Only. A yellow collision box will appear. Press [G] to toggle game mode if you can't see it.
• Use Box Scale 3D to change the size of the box
• Use Box Location to offset the box from the marker, if necessary.

Under the Hood

The Variation Actor will send the choosen variation to the connected blueprints. The connection is established with the Blueprint Interface. Here is what happens under the hood.

1. If the Call Interface variable is set to ON
2. All actors that have the BPI_UI3_Interaction blueprint interface are collected from the scene.
3. For Each of those actors...
4. ... the function Change to Variation ID is called and the Variation ID and the Tag are sent

1. The function Change Variation to ID is executed
2. Is the Tag named Fan? If True, this interface call is for this blueprint. Execute the nodes.
3. A value is selected depending on the value of Change to ID
4. The Rotation Rate variable is set to the selected value
5. The Event Tick rotates the fan constantly by a set amount. The new Rotation Rate value will make the rotation faster or slower.

Either double click them or right click and choose Implement Event to get them into the Event Graph.

Function Interact

The other function that comes with the blueprint interface is called Interact. It doesn't have any variables. It is meant for doors to open or any other event that just needs to be activated and has no options. The UI sends this event when the interaction button is pressed. By default the interaction button is [ R ] on the keyboard and (Y) on the controller.

The door blueprint may have a blueprint interface with the same name as the UI3 unfortunately in earlier versions. Make sure the interface from the UI3 is added and not the one with the same name.

Read more in the Door Blueprint Documentation.

Interactive Doors Documentation

Find the BP_KitchenBuilder_SwapActor and connect the blueprint interface to it. Update connections as described for the doors blueprint.

• Variation Materials are set in the Kitchen Swap Actor
• The UI3 Variations Actor only contains the Variation Names

Modular Kitchen Builder Swap Actor Documentation

They both work the same way:

• First add the BPI_UI3_Interaction interface to the class settings
• Then add the Change Variation to ID event to the graph
• Check if the tag sent is the one set in the blueprint
• Add a switch on INT node and connect the actions you want the blueprint to perform for each of the variation IDs received.

Read more

Here is a short quick guide

• Remove any sky box items like: directional light, skylight, fog, clouds, sky atmosphere.
• Place the UDSky blueprint at ground level in your scene.
• Set the time in the top settings section.
• Browse down to Simulation and change the following settings:

• Set the default values for the projects app in the Info Map in the Dynamic Sky section. This is how the app will start.

Functions

There are 2 functions you will have to change. They are

• either in the UI3_MainMenu widget. It's in the UI/Widgets folder.
• or in the BFL_Customization Library in the UI/Blueprints Folder

Find and open the widget or library. Look for the 2 functions Get Sun Sky and Set Sun Sky.

The function to connect EFM can be in different locations. This image shows the location in the Character for version in the first half of 2024:

• Open the SDOTUI3_CharacterV3 from the blueprint directory.
• Go to the function Save List
• Add the nodes marked EFM to the blueprint and connect the nodes as seen in the image.
• Compile and save the character blueprint.

Easy File Manager EFM

• Open the SDOTUI3_CharacterV3 from the blueprint directory.
• Go to the function Create List
• Go to the bottom of the graph nodes and connect the nodes as seen in the image.
• Compile and save the character blueprint.

Make a copy of the function library before you update your project to a newer version of the UI3 project. Then copy it back to save your changes.

You can't copy into a different engine version (5.3 to 5.4). You would need to migrate instead.