Fix gizmo picking

src/Gizmos/cameraGizmo.ts

@@ -176,12 +176,15 @@ export class CameraGizmo extends Gizmo {
                 var line = LinesBuilder.CreateLines("lines", { points: [new Vector3(-1 + x, -1 + y, -1), new Vector3(-1 + x, -1 + y, 1)] }, scene);
                 line.parent = mesh;
                 line.alwaysSelectAsActiveMesh = true;
+                line.isPickable = false;
                 var line = LinesBuilder.CreateLines("lines", { points: [new Vector3(-1, -1 + x, -1 + y), new Vector3(1, -1 + x, -1 + y)] }, scene);
                 line.parent = mesh;
                 line.alwaysSelectAsActiveMesh = true;
+                line.isPickable = false;
                 var line = LinesBuilder.CreateLines("lines", { points: [new Vector3(-1 + x, -1, -1 + y), new Vector3(-1 + x,  1, -1 + y)] }, scene);
                 line.parent = mesh;
                 line.alwaysSelectAsActiveMesh = true;
+                line.isPickable = false;
             }
         }