How to cast to the location of a separate Actor on an input event?

[Everynone]

Spline + Spline Mesh Component. Or ribbon particle (orwhatshername) in Niagara.

Check here:

Connect mesh between two world vectors at runtime?

Spline mesh component can deform meshes. Or are you actively trying to avoid using a spline? As in: [Screenshot_6] This is using a cube as the beam mesh, scaled down. Would that work?

And here:

Laser beam that locks and follows a target

I would suggest getting into Niagara. This channel helped me a lot Also here for the initial beam setup Then for the follow mechanics you use need to make a user parameter for the beam end variable so you can manipulate it from a blueprint Video is in french but you can turn the sound of and follow it anyway. [Niagara : How to create electric arcs between 2 points - UE4 tutorials]

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You can also draw lines with widgets, and the HUD class does it well, too. Plenty of options, actually. Even the materials can draw 2d / 3d splines - but there’s an upfront cost to setting it up.

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outside of the editor

So a shipped product or… ?