I try to achieve an interactive setting - maybe on a touch screen - where something is hidden behind a blurred window and you are able to wipe the blur away.
My thoughts:
Taking an image plane with alpha and let the mouse point array generate a kind of mask but i only found Freehand Mask which can’t be used in play mode.
Another workaround I’m playing with right now is a render to texture feeding the mask of the overlay image plane and giving the Mouse Picker control of the emission position of a 2D Field Emitter.
Using Render to Texture would be my suggestion for this.
Add two Image 2D nodes (one blurred and one not), and a Mouse Point Array controlling a Shape 3D all parented to the RTT. Then if you add a Frame Feedback and adjust the Previous Frame Feedback, you’ll end up with a wipe effect that can be edited to last longer or blur again.