You can render the UV’s from the plane, and use the is_transmission or is_camera to filter direct rays/refracted rays…
I use a very similar technic whenever I need caustics in some scene. You can read about it here: Caustics in Cycles.
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You can render the UV’s from the plane, and use the is_transmission or is_camera to filter direct rays/refracted rays…
I use a very similar technic whenever I need caustics in some scene. You can read about it here: Caustics in Cycles.