Excluding part of an object from render

[Anonymous]

Hey everyone, I've been looking for an answer to this question for about a week and I haven't found an answer so I decided to ask here. My situation is as follows:

Basically, I have a plane that I want to render (in yellow)

This plane is going to occasionally collide with another object (teal)

What I am looking for is a way to take everything on one side of the collision (red)

And stop it from being rendered so it looks like this:

I know I could use an opacity map on the plane and keyframe it so each time it collides with the object it makes the top half invisible, but the object it will collide with will be moving across it at multiple angles and it would take a huge amount of effort to keyframe all of that.

Is there a way I could place something like a Box shape linked to the colliding object (like the red one I used to show the part I would like to not render), then set it up so any part of the plane (and only the plane, as the Box would likely clip into other objects that I need rendered) that is within the Box would not render, and then I could just set the Box opacity to 0 before I render to hide that part of the plane?

[Anonymous]

Try the "Slice" modifier.

Animate its Gizmo, or constrain it to the collision object by instancing its controller.