Pass: Cleanup geometry for FullScreenQuad. (#26938)

examples/jsm/postprocessing/Pass.js

@@ -43,9 +43,20 @@ const _camera = new OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );
 
 // https://github.com/mrdoob/three.js/pull/21358
 
-const _geometry = new BufferGeometry();
-_geometry.setAttribute( 'position', new Float32BufferAttribute( [ - 1, 3, 0, - 1, - 1, 0, 3, - 1, 0 ], 3 ) );
-_geometry.setAttribute( 'uv', new Float32BufferAttribute( [ 0, 2, 0, 0, 2, 0 ], 2 ) );
+class FullscreenTriangleGeometry extends BufferGeometry {
+
+	constructor() {
+
+		super();
+
+		this.setAttribute( 'position', new Float32BufferAttribute( [ - 1, 3, 0, - 1, - 1, 0, 3, - 1, 0 ], 3 ) );
+		this.setAttribute( 'uv', new Float32BufferAttribute( [ 0, 2, 0, 0, 2, 0 ], 2 ) );
+
+	}
+
+}
+
+const _geometry = new FullscreenTriangleGeometry();
 
 class FullScreenQuad {