Merge pull request #7675 from MiiBond/fix_cube_rendertarget_dispose

Replace disposing __webglRenderbuffer with __webglDepthbuffer

src/renderers/WebGLRenderer.js

@@ -569,14 +569,14 @@ THREE.WebGLRenderer = function ( parameters ) {
 			for ( var i = 0; i < 6; i ++ ) {
 
 				_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ] );
-				_gl.deleteRenderbuffer( renderTargetProperties.__webglRenderbuffer[ i ] );
+				_gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer[ i ] );
 
 			}
 
 		} else {
 
 			_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer );
-			_gl.deleteRenderbuffer( renderTargetProperties.__webglRenderbuffer );
+			_gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer );
 
 		}