Is there any ways to Transfrom Motion Vector to Screen UV?

Unity Engine
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Hello,I am creating a stylized post-processing shader, and I want to achieve a speed streak effect when characters or viechles move. My idea is to use Motion Vectors to determine the movement direction of each pixel, and then use this movement direction as a UV coordinate to sample a noise texture, allowing some streaks to move along the movement direction of the object or character. I’ve figured out most of the functionality, but I’m stuck on how to generate the UV using vectors. I couldn’t find a similar solution online (or maybe I just didn’t find right keywords), so I’m asking for advice on how to calculate and obtain the UV.

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Any suggestions and tips would be greatly appreciated!

2

Problem solved! Just in case someone might see this later, I’ll share my method:

After getting the MotionVector, I separated the y and x components and used atan2 for V. Then, I calculated the Length to get the motion speed of each pixel and used that as U. After combining them, I got the screen-space coordinates based on the MotionVector, which allowed me to create a lot of effects.

(Looking back, this might just be a basic math problem, but since I’m mainly focused on art, coming up with this method really burned a lot of brain cells!) lol