Three.js Error creating WebGL context

Question

Friends, I need your help, the following code in three.js, all return null in this line:

_context || _canvas.getContext( 'webgl', attributes ) || _canvas.getContext( 'experimental-webgl', attributes );

function initGL() {

    try {

        var attributes = {
            alpha: _alpha,
            depth: _depth,
            stencil: _stencil,
            antialias: _antialias,
            premultipliedAlpha: _premultipliedAlpha,
            preserveDrawingBuffer: _preserveDrawingBuffer
        };

        _gl = _context || _canvas.getContext( 'webgl', attributes ) || _canvas.getContext( 'experimental-webgl', attributes );

        if ( _gl === null ) {

            throw 'Error creating WebGL context.';

        }

    } catch ( error ) {

        console.error( error );

    }

    _glExtensionTextureFloat = _gl.getExtension( 'OES_texture_float' );

the attributes value:

enter image description here

this is canvas:

enter image description here

Thanks a lot!

~Rosone

Shouldn't you mention which browser and OS you're using? Is it one of the ones supported? Does it support WebGL? — Bob Woodley
– Bob Woodley, Commented Dec 18, 2014 at 13:16
win2008 server, chrome, threejs example can work. I'm reviewing the code. actually just:this.scene = new THREE.Scene(); this.camera = new THREE.PerspectiveCamera(75, this.canvas.width / this.canvas.height, 0.1, 1000); this.renderer = new THREE.WebGLRenderer({ canvas: this.canvas, antialias: true }); — Lindy
– Lindy, Commented Dec 19, 2014 at 2:53

bad_coder · Accepted Answer · 2020-11-10 15:06:31Z

2

I found the reason: It's because another context (canvas.getContext('2d') ) already occupied this same canvas.

edited Nov 10, 2020 at 15:06

bad_coder

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answered Dec 19, 2014 at 4:09

Lindy

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1 Comment

Kalnode Over a year ago

IMHO, this can happen simply by creating new <canvas> instances in different pages in a single-page app. Do your best to "destroy" the previous <canvas> element and instances related libraries (e.g. a 3d engine).

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