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How to make Sword Trail Effect
I'm trying to make sword trail Effect with Trail Renederer. I don't know if I should call it "angle", the angle of the trail isn't that I want. How can I set angle to the sword? I hope the image will help you to understand what I want to say. Thanks in advance to all who could help! 
How are you currently moving the Trail Renderer along with the sword? Are you setting its position to match the sword through script? Is it a child of the sword? Any more information and/or script samples of what you're currently doing would be helpful.
I'm sorry that I wrote too less information. There isn't any script, and the Trail Renderer is attached to the empty gameobject which is child of Sword object. And Sword object has a sword mesh as child. If you need more, please leave a comment. I'm really thankful that you left me a comment.
A cursory look around online (A google search for "Unity trailrenderer sword") suggests that this isn't especially simple to implement (although, at the same time, was comprised mainly of forum posts and youtube videos from 2011-2014).
On the other hand, those also tended to provide information on free assets (or similar) for creating a trail renderer manually between two points (i.e. hilt and tip of sword blade).
I don't know how to do this with a trail renderer but using a particle system attached to the sword transform you can get effects like this quite easily: https://www.youtube.com/watch?v=c8hijUge7IY&ab_channel=GabrielAguiarProd.
The I ditched the trail renderer pretty quickly as it tends to freak out with with sudden changes in direction
It's not that I want, but it was very helpful for me. Thank you so much! :)
