NodeMaterial: Fix setting of extensions.

examples/jsm/nodes/materials/NodeMaterial.js

@@ -68,6 +68,11 @@ NodeMaterial.prototype.onBeforeCompile = function ( shader, renderer ) {
 	shader.vertexShader = this.vertexShader;
 	shader.fragmentShader = this.fragmentShader;
 
+	shader.extensionDerivatives = ( this.extensions.derivatives === true );
+	shader.extensionFragDepth = ( this.extensions.fragDepth === true );
+	shader.extensionDrawBuffers = ( this.extensions.drawBuffers === true );
+	shader.extensionShaderTextureLOD = ( this.extensions.shaderTextureLOD === true );
+
 };
 
 NodeMaterial.prototype.customProgramCacheKey = function () {