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How to make a continuous beam weapon?

Hello. So I'm very new to UE4 and can't seem to find a tutorial for exactly what I'm looking for. I've already used a tutorial for a laser sight, however I only want the laser to appear while the trigger is being held down. I've tried using InputAction and a Gate to limit it but the laser still exists before I fire and then remains still in space once I let go. I have a picture of what the start of my blueprint looks like. Hopefully this isn't too complicated. Thanks for the help!

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Product Version: UE 4.17
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asked Sep 29 '17 at 03:02 AM in Blueprint Scripting

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JoeMG
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You can look into particle cascade; here is a great entry about making a beam weapon:

https://www.unrealengine.com/en-US/blog/lasers-shields-planets-polishing-arsenal

Another method that worked for me was a simple spline with 2 points. You're calculating the points already. Add spline mesh with a dynamic material instance and you've got a beam:

https://forums.unrealengine.com/development-discussion/rendering/111880-display-potential-path-to-the-point

You will need to update it on tick if the target or the source is re-positioned.

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answered Sep 29 '17 at 07:35 AM

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Everynone
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avatar image Greywacke Sep 29 '17 at 08:28 AM

That's actually a really cool resource. Thanks for sharing!

avatar image Everynone Sep 29 '17 at 09:26 AM

If you ever manage to achieve what you need, please consider marking this issue as resolved. Otherwise, keep the questions coming.

avatar image MasterFuzzFuzz Nov 09 '17 at 12:05 AM

That couldn't have been less helpful. There's no BP in any part that shows how it all fits together

avatar image Everynone Nov 09 '17 at 08:13 AM

I disagree. It's a blog describing the concept behind it all, including dos and donts, not a tutorial and the entire material setup is in there which is 95% of the setup you need. The rest is a breeze by comparison.

If you do not want to use emitters, particles and cascade, you can achieve a very similar effect with a spline. Have a look at the link below; again, it's not step-by-step but should have enough details to get you started (look for a section with a blown out mesh image, somewhere in the middle):

https://answers.unrealengine.com/questions/715256/how-to-output-print-string-into-a-ui-widget.html

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