Transforming the CanvasRenderer into a WebGLRenderer

Question

Transforming the CanvasRenderer into a WebGLRenderer

I'm interested in implementing a visual effect similar to the one demonstrated in the example here:

To achieve this, I want to modify the renderer to use WebGLRenderer instead of CanvasRenderer by changing:

renderer = new THREE.CanvasRenderer();

to

renderer = new THREE.WebGLRenderer();

This way, I aim to combine this effect with another that already utilizes WebGL.

However, when I make this change, I encounter errors with the rendering of particles, resulting in the following message:

three.js:18501 Uncaught TypeError: Cannot read property 'offset' of undefined at WebGLSpriteRenderer.render (three.js:18501) at WebGLRenderer.render (three.js:22287) at render (canvas_particles_waves.html:184) at animate (canvas_particles_waves.html:157)

Any suggestions or insights on how to resolve this issue?

Thank you in advance!

javascript three.js

Answer 1

Answer №1

Success, I've figured it out!

In the CanvasRenderer demo, the circles are created using 2D Canvas drawing commands, like this:

var material = new THREE.SpriteCanvasMaterial( {
    color: 0xffffff,
    program: function ( context ) {<br>
        context.beginPath();
        context.arc( 0, 0, 0.5, 0, PI2, true );
        context.fill();
    }
});

However, these 2D drawing commands are not suitable for 3D WebGL, so I made the following adjustments:

var geometry = new THREE.SphereGeometry( 5, 32, 32 );
var material = new THREE.MeshBasicMaterial( {color: 0xffff00} );

Then, within the nested for loop, I updated the first line to:

particle = particles[ i ++ ] = new THREE.Mesh( geometry, material );

That's all! Everything else remains the same and functions correctly.

Answer 2

Success, I've figured it out!

In the CanvasRenderer demo, the circles are created using 2D Canvas drawing commands, like this:

var material = new THREE.SpriteCanvasMaterial( {
    color: 0xffffff,
    program: function ( context ) {<br>
        context.beginPath();
        context.arc( 0, 0, 0.5, 0, PI2, true );
        context.fill();
    }
});

However, these 2D drawing commands are not suitable for 3D WebGL, so I made the following adjustments:

var geometry = new THREE.SphereGeometry( 5, 32, 32 );
var material = new THREE.MeshBasicMaterial( {color: 0xffff00} );

Then, within the nested for loop, I updated the first line to:

particle = particles[ i ++ ] = new THREE.Mesh( geometry, material );

That's all! Everything else remains the same and functions correctly.

Transforming the CanvasRenderer into a WebGLRenderer

Answer №1

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