Process management enables you to control the flow of events according to a predefined workflow. For example, when a nodding gesture is detected, a hat appears on the user's head.
In Tencent Effect's process management system, there are four core modules: trigger conditions, logic evaluation, trigger results, and value definitions. Each module contains various triggers that can be combined to achieve your desired playback effect.
Basic Usage
Step 1: Expression Trigger
An expression trigger activates the next node when a specified facial expression appears or disappears.
1. Import resources, such as a PNG image, to be displayed when triggered.
2. Add a foreground sticker in the object panel.
3. Select the image file for the foreground sticker.
4. Adjust the position of the image file.
5. Switch from the scene panel to the process panel, then add a process management object.
6. Right-click the process panel and select "Add node". Add an "Appear/Disappear" node.
7. Double-click the "Appear/Disappear" node title to add an object to it.
8. Right-click the process panel and select "Add node". Add an "Expression Trigger" node.
9. Right-click the process panel and select "Add node". Add another "Appear/Disappear" node.
10. Add an object to the "Appear/Disappear" node added in step 9.
11. Connect the nodes: Initially, the foreground sticker is hidden. When a mouth-opening action is detected, the foreground sticker becomes visible.
12. Preview the effect: Click the play button to see the result.
Step 2: Carousel Trigger
Carousel triggers apply to expressions or actions, enabling materials to be played in a loop. Each detected action switches the display to a different material.
1. Follow steps 1–11 from the expression trigger tutorial to create a project. Import two image files, add a foreground sticker and a face-following sticker, two "Appear/Disappear" nodes, and an "Expression Detection" node. Connect them as shown below:
2. Add a "Trigger Cycle" node. The trigger cycle prevents repeated activation when the user keeps their mouth open for an extended time. Set a trigger rate limit, typically between 0.5–0.8 seconds.
3. Double-click the node to adjust the trigger interval, setting it to trigger once every 0.5 seconds.
4. Add a "Carousel Object" node.
5. Edit the carousel object node: Add both the foreground sticker and the face-following sticker as objects.
6. Connect all nodes as shown below:
7. After setup, preview the effect. The display is triggered by the mouth-opening action.
