clear( renderer, color = true, depth = true, stencil = true ) {

		const currentRenderTarget = renderer.getRenderTarget();

		for ( let i = 0; i < 6; i ++ ) {

			renderer.setRenderTarget( this, i );

			renderer.clear( color, depth, stencil );

		}

		renderer.setRenderTarget( currentRenderTarget );

	}
Clears this cube render target.

@param {WebGLRenderer} renderer - The renderer.
@param {boolean} [color=true] - Whether the color buffer should be cleared or not.
@param {boolean} [depth=true] - Whether the depth buffer should be cleared or not.
@param {boolean} [stencil=true] - Whether the stencil buffer should be cleared or not.