Building off of the Animated Object Template, the Interactive Approach allows you to add 3D animated content to the world. When the user physically moves within range of the object, it plays an additional animation. After being approached, the object then plays an additional idle animation. The template gives you access to manipulation control which allows the user to move, scale and rotate the object.

Tutorial

Guide

Exporting 3D Content

The Interactive Approach Template assumes that you have a 3D animated object which you'll be importing into Lens Studio. First you must export your object to be Lens Studio ready. To do this, follow the 3D Object Export guide.

Warning
The Interactive Approach Template needs three layers of animation in the exported FBX. To learn more about how to prepare multiple animation layers, follow the Maya Export guide. If your 3D tool does not support animation layers, you can create Animation Clips inside Lens Studio. Follow the Playing 3D Animation guide's Animation Clip section for information on how to create Animation Clips. 

Importing 3D Content

Once you have your 3D object exported, follow the 3D Object Import guide to import your 3D object into Lens Studio.

Linking the World Object

After importing, the 3D object will be automatically included in the Objects panel and should also be visible in the Scene panel. Next, you'll want to drag your newly imported object to be a child of the WorldObjectController object. You can now delete the template's placeholder object labeled with [REPLACE_ME].

Linking the Animation

Next, we need to link the imported object's AnimationMixer component to the IdleAnim script. Select the WorldObjectController object and open the Inspector panel. Find the IdleAnim script and link the Animation Mixer field to your model's animation mixer.

Defining the Animation Names

When using multiple animations in a single FBX, they will be imported into Lens Studio as Animation Layers. These layers can be used to define the additional animations that will play on interaction. For the Interactive Approach Template, set the Idle Anim Layer field to the layer name of your starting idle animation. Then, set the Approach Start Anim Layer field to the layer name of your approach animation which will play when the user gets within a specified range of the object, defined by Trigger Radius. Finally, set the Approach Loop Anim Layer field to the layers name of your looping idle animation which will play after the object has been approached.

Tuning the Collision

The TouchCollision object represents the area the user must touch to manipulate (scale, move and rotate) the object. In the Objects panel, select the TouchCollision object and scale it to roughly match the size of your 3D object.

Adding the Shadow

If you want to add a real-time shadow to your experience, first select your 3D object in the Objects panel. Find the object(s) with the Mesh Visual component. In the Inspector panel, set the Shadow Mode drop down to Caster. Here, you're also able to tune the shadow's intensity via the Shadow Density slider.

Audio

You can add audio to your animation by importing an audio file into the Resources panel and referencing it in the IdleAnim.js and ApproachAnim.js scripts (found on the WorldObjectController object). We recommend using a mono channel mp3 to keep the lens size low. For more information on Audio, see the Audio guide.

Previewing Your Lens

You're now ready to preview your world Lens experience. To preview your Lens in Snapchat, follow the Pairing to Snapchat guide.

Script Interface

WorldObjectController.js

• Use Ground Grid (bool) - When enabled, a circular grid will appear underneath the world object when the user touches the object. This grid helps visualize the surface the content is attached to. Setting to false will disable the ground grid visualization

• Touch Collision Material (Asset.Material) - The material used by the touch collision mesh. In Lens Studio's scene panel, the mesh is visualized with a semi transparent material. When running in Lens, this material is made invisible

• Ground Grid (SceneObject) - A reference to the ground grid object

IdleAnim.js

• Animation Mixer (Component.AnimationMixer) - A reference to the world object's Animation Mixer component

• Idle Anim Layer (string) - The name of the anim layer that should be played for the idle animation. The anim layer name is configured in your external 3D editor. The anim layer name is also listed in the object's Animation Mixer component

• Anim Audio (Asset.AudioTrackAsset) - A reference to an Audio Track Asset in your resources. If set, the inputted audio will play alongside your animation

ApproachAnim.js

• Approach Start Anim Layer (string) - The name of the animation layer that should be played when the user gets within range of the object. The animation layer name is configured in your external 3D editor. The animation layer name is also listed in the object's Animation Mixer component

• Approach Loop Anim Layer(string) - The name of the animation layer that should be looped after the user approaches the object. The animation layer name is configured in your external 3D editor. The animation layer name is also listed in the object's Animation Mixer component

• Approach Start Anim Audio (Asset.AudioTrackAsset) - A reference to an Audio Track Asset in your resources. If set, the inputted audio will play alongside your approach start animation

• Approach Loop Anim Audio (Asset.AudioTrackAsset) - A reference to an Audio Track Asset in your resources. If set, the inputted audio will play alongside your approach loop animation

• Camera Object (SceneObject) - A reference to the camera object. This reference allows the script to know how far the user is from the object

• Trigger Radius (float) The maximum distance the user must be within to trigger the approach animations

Related Guides

Please refer to the guides below for additional information:

• Getting Started
• 3D Object Export
• 3D Object Import
• Pairing to Snapchat
• Scripting Overview