= 0.02;

				} );

				//

				// remove the background
				const initialBackground = scene.background;
				scene.background = null;

				// force the depthMaterial to everything
				cameraHelper.visible = false;
				scene.overrideMaterial = depthMaterial;

				// set renderer clear alpha
				const initialClearAlpha = renderer.getClearAlpha();
				renderer.setClearAlpha( 0 );

				// render to the render target to get the depths
				renderer.setRenderTarget( renderTarget );
				renderer.render( scene, shado