setupEnvironment( builder ) {

		const envNode = super.setupEnvironment( builder );

		return envNode ? new BasicEnvironmentNode( envNode ) : null;

	}
Overwritten since this type of material uses {@link BasicEnvironmentNode}
to implement the default environment mapping.

@param {NodeBuilder} builder - The current node builder.
@return {?BasicEnvironmentNode<vec3>} The environment node.