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So I think the way to do this is to make the laser beam out of a stroke and then set the length on the laser pointer gadget the same length as the stroke (use the grid to make the stroke a nice neat length.
Then wire the current laser pointer length into the end point input on the stroke.
The laser pointer also gives you a hit position which can be wired into the spawn position on an emitter so you can emit sparks when the laser hits a surface.
Hope this helps :) Peter