Unity VR XR Interaction Toolkit - Make Grabbable Objects

Introduction

In this tutorial, you will learn how to create grabbable objects in Unity using the XR Interaction Toolkit. This guide is designed for beginners who want to enhance their VR projects by implementing interactive elements. By the end of the tutorial, you will be able to set up a 3D object that can be grabbed and manipulated in a VR environment.

Step 1: Create a 3D Object to Grab

1. Open Unity and create a new 3D project.
2. In the hierarchy, right-click and select 3D Object > Cube (or any other shape you prefer).
3. Position the object in your scene where it can be easily accessed during testing.

Step 2: Create a Material for the Object

1. In the Assets panel, right-click and select Create > Material.
2. Name the material (e.g., "GrabbableMaterial").
3. Choose a color or texture for your material in the Inspector panel.
4. Drag the material onto your 3D object in the scene to apply it.

Step 3: Add an XR Grab Interactable Component

1. Select your 3D object in the hierarchy.
2. In the Inspector panel, click on Add Component.
3. Search for and add the XR Grab Interactable component.
4. Ensure the component is properly configured, allowing it to be interacted with in VR.

Step 4: Set Up Options in the XR Grab Component

1. With the 3D object still selected, look for the XR Grab Interactable settings in the Inspector.
2. Adjust the following options:
   • Movement Type: Set to "Kinematic" for smoother interaction.
   • Attach Transform: Create an empty GameObject as a child of the 3D object to serve as the attachment point.
3. Ensure that the Use Gravity option is enabled if you want the object to fall when released.

Step 5: Test Grabbing the Game Object

1. Save your scene and enter Play Mode.
2. Use your VR headset and controllers to test grabbing the object.
3. Ensure that you can pick it up and move it around without issues.

Step 6: Fix Rotating and Moving Object That is Grabbed

1. If the object rotates unexpectedly when grabbed, adjust the settings:
   • Go to the XR Grab Interactable component and tweak the Rotation settings.
   • Consider setting the Track Position and Track Rotation options according to your needs.
2. Test in Play Mode again to ensure the object behaves as expected.

Final Testing and Conclusion

1. Perform final tests by interacting with the object in different scenarios.
2. Make necessary adjustments based on your testing experience.

In conclusion, you have successfully created a grabbable object in Unity using the XR Interaction Toolkit. This foundational skill will enhance your VR projects and allow for more interactive gameplay. Explore adding more complex interactions as you become comfortable with the toolkit. Happy developing!