I want change color of cube by clicking a button

Burhanuddin_Limdiwal · April 27, 2025, 2:30pm

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class ChangeCubeColor : MonoBehaviour
{
// Start is called before the first frame update
public GameObject cube; // Assign your cube here in the inspector
public Button changeColorButton; // Assign your button here in the inspector

void Start()
{
    // Add a listener to the button
    changeColorButton.onClick.AddListener(ChangeColor);
}

public void ChangeColor()
{
if (cube != null)
{
// Change the cube’s color to a random color
cube.GetComponent().material.color = Color.blue;
}
}
}

i am using this script and it is not working

needle-assistant · April 27, 2025, 2:30pm

Hi Burhanuddin Limdiwala,

Let’s troubleshoot your script for changing the cube’s color using the button. Here’s a step-by-step checklist to ensure everything is set up correctly:

Cube Assignment: Ensure that you’ve assigned the cube GameObject in the Unity inspector. If it’s not assigned, cube will be null.
Button Assignment: Similarly, make sure that you have assigned the changeColorButton to the appropriate Button component in the inspector.
Event System: Confirm that your scene contains an EventSystem GameObject. Unity requires this for UI elements to function correctly.
Canvas Setup: Ensure that your Button is placed inside a Canvas in your scene.
Renderer Component: Make sure the cube has a Renderer component.

Here is your existing code with the random color commented out, replaced with a fixed color for easier testing:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class ChangeCubeColor : MonoBehaviour
{
    // Start is called before the first frame update
    public GameObject cube; // Assign your cube here in the inspector
    public Button changeColorButton; // Assign your button here in the inspector

    void Start()
    {
        // Add a listener to the button
        changeColorButton.onClick.AddListener(ChangeColor);
    }

    public void ChangeColor()
    {
        if (cube != null)
        {
            // Change the cube's color to blue
            cube.GetComponent<Renderer>().material.color = Color.blue;
        }
        else
        {
            Debug.LogError("Cube is not assigned!");
        }
    }
}

Tips:

Check the Console for any errors or logs indicating issues.
If you see the “Cube is not assigned!” error, revisit the inspector to confirm the assignments.
Make sure your cube is active in the scene when you click the button.

If this does not resolve the issue, please let me know about any error messages you receive, or if you have specific details about your Unity setup that might affect the script.

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Burhanuddin_Limdiwal · April 27, 2025, 2:35pm

this is not working

needle-assistant · April 27, 2025, 2:36pm

Hi Burhanuddin Limdiwala,

To assist you more effectively, could you please provide the following details?

Error Messages: Are there any error messages in the Unity Console?
Unity Version: Which version of Unity are you using?
Inspector Setup: Can you confirm that the cube and changeColorButton GameObjects are correctly assigned in the inspector?
Scene Setup: Is there an Event System and Canvas present in your scene?

Providing these details will help diagnose the issue more accurately.

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Burhanuddin_Limdiwal · April 27, 2025, 2:47pm

I am not getting any error message
unity version 6.033f1
Inspector Setup:yes
Scene Setup :yes

needle-assistant · April 27, 2025, 2:47pm

Hi Burhanuddin_Limdiwal, I’m sorry but I can’t help you right now. You have reached the maximum number of replies. . Please try again later or get a PRO license for more AI help.
**

Burhanuddin_Limdiwal · April 27, 2025, 2:48pm

i have pro license

needle-assistant · April 27, 2025, 2:48pm

Hi Burhanuddin_Limdiwal, I’m sorry but I can’t help you right now. You have reached the maximum number of replies. . Please try again later or get a PRO license for more AI help.
**

Felix_Herbst · April 27, 2025, 2:58pm

To me it looks like what you’re showing here is a C# script inside Unity. Needle uses TypeScript components. Would recommend you take a look at our getting started docs.

The easiest way to change color on click is to use the SetMaterialOnClick component from our Everywhere Actions.

marwie1 · April 28, 2025, 8:17am

I have sent you a DM to verify your license since I can’t find a license registered using your name or email address. Thanks

Burhanuddin_Limdiwal · April 28, 2025, 3:27pm


import { Behaviour, serializable, findComponent, Object3D, MeshRenderer } from "@needle-tools/engine";

export class ChangeCubeColor extends Behaviour {

    @serializable(Object3D)
    cube?: Object3D;

    @serializable()
    buttonSelector: string = "#changeColorButton"; // e.g., "#myButton"

    private _button?: HTMLButtonElement;

    awake() {
        this._button = document.querySelector(this.buttonSelector) as HTMLButtonElement;
        if (this._button) {
            this._button.addEventListener("click", () => this.changeColor());
        }
    }

    changeColor() {
        if (this.cube) {
            const renderer = findComponent(this.cube, MeshRenderer);
            if (renderer) {
                renderer.setColor("#0000ff");
            }
        }
    }
}

Burhanuddin_Limdiwal · April 28, 2025, 4:19pm

i have use this object 3d and find component error

marwie1 · April 28, 2025, 4:31pm

Hi, could you please share the whole error message?

Your import statement is not correct. Object3D needs to imported from three like so: import { Object3D } from "three"

FindComponent does not exist. You probably mean findObjectOfType? Or this.cube.getComponentInChildren(MeshRenderer) and then set the color on the sharedMaterial (it’s a threejs Material type so you might need to cast it to e.g. a MeshStandardMaterial and then set the color)

Please also take a look at Creating and using Components | Needle Engine Documentation to learn how to write custom scripts for Needle Engine

Could you also reply my question here? I want change color of cube by clicking a button - #10 by marwie1

marwie1 · April 29, 2025, 12:16pm

Here’s some small example code for how to change the color - i hope it helps

Burhanuddin_Limdiwal · April 29, 2025, 1:11pm

Can you please provide me for button click and color change by script

marwie1 · April 29, 2025, 1:21pm

Here you go Needle-engine Change Color Example - StackBlitz

import {
  Behaviour,
  Button,
  MeshRenderer,
  serializable,
} from '@needle-tools/engine';
import { Color } from 'three';

export class ChangeColor extends Behaviour {
  @serializable(Button)
  button?: Button;

  @serializable(Color)
  color?: Color;

  @serializable(MeshRenderer)
  target?: MeshRenderer;

  onEnable(): void {
    this.button?.onClick?.addEventListener(this.changeColor);
  }
  onDisable(): void {
    this.button?.onClick?.removeEventListener(this.changeColor);
  }

  private changeColor = () => {
    if (!this.color || !this.target) return;
    for (const mat of this.target.sharedMaterials) {
      if (mat && 'color' in mat && mat.color instanceof Color) {
        mat.color.set(this.color);
      }
    }
  };
}

Burhanuddin_Limdiwal · April 30, 2025, 3:17pm

Hi i am using pro version of needle from different account how to remove needle logo when loading

Burhanuddin_Limdiwal · April 30, 2025, 3:41pm

debug_console.ts:24 Tip: You can add the “?console” query parameter to the url to show the debug console (on mobile it will automatically open in the bottom right corner when your get errors during development. In VR a spatial console will appear.)
Open this page to get the console: https://192.168.1.2:3000/?console=1
three.quarks.esm.js:3106 Particle system powered by three.quarks. https://quarks.art/
WebXRButtons.ts:218 [WebXR] “immersive-ar” is not supported on this device – make sure your server runs using HTTPS and you have a device connected that supports immersive-ar
WebXRButtons.ts:218 [WebXR] “immersive-vr” is not supported on this device – make sure your server runs using HTTPS and you have a device connected that supports immersive-vr
engine_context.ts:1199 Frame #52
TypeError: Cannot read properties of undefined (reading ‘visible’)
at projectObject (three.module.js:30142:28)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at WebGLRenderer.render (three.module.js:29922:4)
at WebGLRenderer.wrappedFunction (engine_patcher.ts:135:41)
at renderer.render (lods_manager.js:156:34)
at WebGLRenderer.wrappedFunction [as render___needle] (engine_patcher.ts:135:41)
at _Context.renderNow (engine_context.ts:1470:18)
update @ engine_context.ts:1199
engine_context.ts:1199 Frame #53
TypeError: Cannot read properties of undefined (reading ‘visible’)
at projectObject (three.module.js:30142:28)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at WebGLRenderer.render (three.module.js:29922:4)
at WebGLRenderer.wrappedFunction (engine_patcher.ts:135:41)
at renderer.render (lods_manager.js:156:34)
at WebGLRenderer.wrappedFunction [as render___needle] (engine_patcher.ts:135:41)
at _Context.renderNow (engine_context.ts:1470:18)
update @ engine_context.ts:1199
engine_context.ts:1199 Frame #54
TypeError: Cannot read properties of undefined (reading ‘visible’)
at projectObject (three.module.js:30142:28)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at projectObject (three.module.js:30158:5)
at WebGLRenderer.render (three.module.js:29922:4)
at WebGLRenderer.wrappedFunction (engine_patcher.ts:135:41)
at renderer.render (lods_manager.js:156:34)
at WebGLRenderer.wrappedFunction [as render___needle] (engine_patcher.ts:135:41)
at _Context.renderNow (engine_context.ts:1470:18)
update @ engine_context.ts:1199
engine_context.ts:1201 Stopping render loop due to error
update @ engine_context.ts:1201
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marwie1 · May 1, 2025, 7:38am

Hi

The account you’re logged in with must be part of a team that has an active license. Then you can disable the branding or customize it. To add a new team member just go to your team page on Needle Cloud, select the team and invite the new member via email.

marwie1 · May 1, 2025, 7:40am

Please include some more details - I’m not sure what you’re asking here. It looks like there’s an error during the renderloop - if that’s the case feel free to report a bug via Unity (Needle Engine/Report a bug) so we can look at the scene/your assets. Otherwise it’s hard to say more without more information.

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I want change color of cube by clicking a button

Tips:

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