I made these sci-fi beams using the line particle effect in Unity 2018.3.0F2 HDRP. I customized the line settings to meet my specifications and then made animations for each sequence for how the beam transitions. You can downgrade to the standard version of Unity as you will need to have Post-Processing installed for the bloom effect to show on the emission values.

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This pack was approved and published on May 29, 2019.

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https://assetstore.unity.com/packages/vfx/particles/sci-fi-bullet-effect-pack-146018

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This pack is now available on ArtStation.

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https://www.artstation.com/tyoder/store/39ey/sci-fi-bullet-effect-pack

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This pack is now available on Eirify.

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https://www.eirify.com/en/sci-fi-bullet-effect-pack

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This pack is now available on Gumroad.

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https://gum.co/pBmYH