Place objects at different time and location

🌵 Needle Engine
1

Is there a way to place many objects in AR at different time and places? Thank you!

2

Hello, polycube! To place multiple objects in AR at different times and locations using Needle Engine, you can utilize a combination of timed placement logic and hit-testing for virtual object placement in the real world.

Here’s a step-by-step pseudocode outline of what you need to do:

  1. Initialize Objects and Timer: Create a data structure to store the objects and their respective timestamps for placement.

  2. Set Up AR Session: Start an AR session and set up hit testing to detect surfaces.

  3. Place Objects at Specified Times:

    • Loop through your list of objects.
    • For each object, check the current time against its intended placement time.
    • When the time matches, perform hit testing to determine the placement location.
    • Position the object at the detected hit point and add it to the scene.

  4. Update and Render: Continuously update which objects should be displayed based on the current time and refresh the AR scene.

Here’s an example code snippet for the process:

import { Mesh, Scene, Vector3 } from "@needle-tools/engine";

class ARObjectPlacer {
    constructor(scene) {
        this.scene = scene;
        this.placedObjects = [];
        this.objectData = [
            { position: new Vector3(1, 0, 0), time: 2000 }, // Place at 2 seconds
            { position: new Vector3(-1, 0, 0), time: 5000 } // Place at 5 seconds
            // Add more objects as needed
        ];
    }

    update(currentTime) {
        for (let i = 0; i < this.objectData.length; i++) {
            const { position, time } = this.objectData[i];
            if (currentTime >= time) {
                this.placeObject(position);
                this.objectData.splice(i, 1); // Remove placed object data
                i--; // Adjust index after removal
            }
        }
    }

    placeObject(position) {
        const obj = new Mesh(/* your object properties here */);
        obj.position.copy(position); // Place at given position
        this.scene.add(obj);
        this.placedObjects.push(obj);
    }
}

// Example usage
const arPlacer = new ARObjectPlacer(yourScene);
setInterval(() => {
    const currentTime = Date.now(); // Or use a more appropriate timer
    arPlacer.update(currentTime);
}, 100); // Check every 100ms

In this example, you would replace yourScene with the actual AR scene you are working with. Ensure that the positions provided are meaningful in your AR context.

Feel free to ask if you have further questions, including about specific implementations or configuration details!

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3

Can I place the object using reticule? I am using Android system.