Enabling an extension on a Three.js shader

Question

How can I enable an extension on a Three.js shader?

My code so far:

getting extension:

var domElement = document.createElement( \'canvas\' );
var         


        

Answer 1

Found the error. You have to use the renderer's dom element:

var gl = renderer.domElement.getContext('webgl') ||
            renderer.domElement.getContext('experimental-webgl');
gl.getExtension('OES_standard_derivatives');

Answer 2

You should also be able to do this:

renderer.context.getExtension('OES_standard_derivatives');