Cannot replicate example from Documentation

🌵 Needle Engine
1

I am trying to modify a little bit Spawn Objects Over Time from here: Script Examples | Needle Engine Documentation
Firstly it demanded to use asset reference, because serializable didnt work well, now it says “instance.clone() is not a function” i tride to use Object3D but error was the same
My code looks like this:
import { AssetReference, Behaviour, GameObject, LogType, serializeable, showBalloonMessage, WaitForSeconds } from “@needle-tools/engine”;
import { Event, Object3D, Vector3 } from “three”;

export class TimedSpawn extends Behaviour {

@serializeable(AssetReference)
object!: GameObject;

interval: number = 1000;
max: number = 100;
spawnRange: Vector3 = new Vector3(10, 10, 10);  // Default range is (-10 to 10) for x, y, z

private spawned: number = 0;


awake() {
    if (!this.object) {
        console.warn("TimedSpawn: no object to spawn");
        showBalloonMessage("TimedSpawn: no object to spawn", LogType.Warn);
        return;
    }
    GameObject.setActive(this.object, false);
    this.startCoroutine(this.spawn())
}

*spawn() {
    if (!this.object) return;
    while (this.spawned < this.max) {
        const instance = GameObject.instantiate(this.object); 
        const randomPos = this.getRandomPosition();
        instance!.transform.position.x = randomPos.x;
        instance!.transform.position.y = randomPos.y;
        instance!.transform.position.z = randomPos.z;
        GameObject.setActive(instance!, true);
        this.spawned += 1;
        yield WaitForSeconds(this.interval / 1000);
    }
}

getRandomPosition(): Vector3 {
    const randomX = Math.random() * this.spawnRange.x * 2 - this.spawnRange.x;
    const randomY = Math.random() * this.spawnRange.y * 2 - this.spawnRange.y;
    const randomZ = Math.random() * this.spawnRange.z * 2 - this.spawnRange.z;

    return new Vector3(randomX, randomY, randomZ);
}

}

Original Post on Discord

by user 697872771497328640

2

@marcel :cactus: I tried just to copy paste the code first to check, but it showed error that serializable used improperly, i just dont get it

by user 697872771497328640

3

Hey :wave: please don’t ping the members directly, we see your message and will reply in a reasonable time :slight_smile:

4

Sorry, I wont next time!

by user 697872771497328640

5

Hi, it looks like you mix up types:

@serializeable(AssetReference)
object!: GameObject;

^ this doesnt make sense. It is either both AssetRefernce or both GameObject.

What you probably want is:

@serializeable(AssetReference)
object!: AssetReference;

Also: please format your posted code using ` + ts (see my screenshot)
image.png

6

see also this example for AssetReferences: Script Examples | Needle Engine Documentation

7

Ok, but when I inser both AssetReference, I got this:

image.png
image.png1492Ă—195 15.8 KB

by user 697872771497328640

8

Ahhhhh

by user 697872771497328640

9

Sorry

by user 697872771497328640

10

I am stupit

by user 697872771497328640

11

Thank you so much

by user 697872771497328640

12

I figured it out

by user 697872771497328640

13

Right, you need to share a bit more information about your project for being able to advice ah good to hear :wink:

14

Yah, I would need to, sorry for bothering you with such stupid questions, I am just tired from coding, 4 days non stop. Your support is best!

by user 697872771497328640

15

you can also always download the sample projects Needle Engine Samples and look at one of the scenes that has a feature similar to what you want - the code is completely available

16

no worries

17

Feel free to ask whenn you’re stuck or share what you’re working on. Just don’t ping as kipash said :slightly_smiling_face:

18

Yeah, I wont, it is just a habit, bad one, but I will try to be careful next time

by user 697872771497328640

19

But I want to say that your engine is awesome, so much possibilities

by user 697872771497328640

20

This one works, but only for one time, and it ignores current position of the spawner, I tried everything, including chatGPT, but cannot find where I am wrong. I just need spawn object periodically in certain location, with some random coordinate drift

import { Vector3 } from "three";

export class TimedSpawn extends Behaviour {
    
    @serializeable(AssetReference)
    object!: AssetReference;

    interval: number = 1000;
    max: number = 100;
    spawnRange: Vector3 = new Vector3(10, 10, 10);  // Default range is (-10 to 10) for x, y, z

    private spawned: number = 0;
    

    awake() {
        if (!this.object) {
            console.warn("TimedSpawn: no object to spawn");
            showBalloonMessage("TimedSpawn: no object to spawn", LogType.Warn);
            return;
        }
        
        // Start the spawn coroutine
        this.startCoroutine(this.spawn());
    }

    *spawn() {
        while (this.spawned < this.max) {
            // Use yield to handle the promise
            const instance = yield this.object!.instantiate();
            if (!instance) return;

            const spawnerPos = this.gameObject.transform.position;  // Get the spawner's current position
            const randomPos = this.getRandomPosition();

            // Adjust the spawned object's position by adding the spawner's position to the random offset
            instance.transform.position.x = spawnerPos.x + randomPos.x;
            instance.transform.position.y = spawnerPos.y + randomPos.y;
            instance.transform.position.z = spawnerPos.z + randomPos.z;

            GameObject.setActive(instance, true);
            this.spawned += 1;
            yield WaitForSeconds(this.interval / 1000);
        }
    }

    getRandomPosition(): Vector3 {
        const randomX = Math.random() * this.spawnRange.x * 2 - this.spawnRange.x;
        const randomY = Math.random() * this.spawnRange.y * 2 - this.spawnRange.y;
        const randomZ = Math.random() * this.spawnRange.z * 2 - this.spawnRange.z;

        return new Vector3(randomX, randomY, randomZ);
    }
}```

*by user 697872771497328640*