3dsMax expression controller?

Eric Chadwick

I have a Vol.Select modifier on one mesh, and point helper linked to another mesh, and I'm trying to get the Vol.Select gizmo to follow the helper. So as the 2nd mesh moves long, it should create a moving selection of the 1st mesh's vertices.

I'm using a helper instead of the 2nd mesh because I need to manually adjust the gizmo position independently of the mesh position, but still have it inherit the mesh position.

Anyhow, can't use Wire Params, or instanced position controllers, because the helper doesn't actually move, so there's no offset being sent to the gizmo.

I tried a position Expression Controller, but it isn't working. Math is making my head spin, but following the Help, I created a Vector variable named helperpos that's assigned to the helper's position, then I changed the Vol.Select gizmo position's expression to this:
<font class="small">Code:</font><hr /><pre>
[0, 0, 0] + helperpos
</pre><hr />

But nothing happens when I drag the time slider.

FatAssasin

I've found it's easier to just use the Mesh Object option instead of the gizmo. That way you can make your own box, sphere, or cylinder and do whatever you want with it using the normal Max tools and controllers.

Eric Chadwick

Awesome, that did the trick. Thanks James!