Unfortunately, this issue is still existant 2 years later using Unity’s built in trail system. The “kinking” still happens when they’re trying to generate the mesh and your best bet is to:
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either write a custom script to calculate bezeire curves… which I definitely have no clue how to do.
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model a custom geo to scroll your trail texture on. While I’m not entirely sure how rub @SrRubfish did it; if I had to go that route I’d definitely model custom geo. I did an art study a year ago and used custom geo for WIP - Klemen Lozar's Riot Art Contest Study
Klemen goes through a nice detailed breakdown in this twitter thread:
The 2nd panel goes through what I mean by custom geo and it’s done using the… “soulercoaster” technique shown here at VFX Basics - Mesh Soulercoasters
@colossaladvent was kind enough to help me out with this technique for Unity in his Bandai Namco - Mobile Reel [2017 - 2018] - #5 by colossaladvent thread.