Help with ShaderToy conversion (multipass)

Thanks to Przemyslaw_Zaworski last time I got help converting a ShaderToy shader to work in Unity. This time I'm converting a multipass shader, https://www.shadertoy.com/view/4tGfDW, but its unclear to me how to get this working in Unity. I've tried to use something called a GrabPass (https://gamedev.stackexchange.com/questions/147425/unity-combining-passes-in-shader), but that doesn't seem to be working. I've tried to give the material a render texture, but that did nothing. Is there a good guide somewhere that might help me hook up something like this multipass shader?

I've attached an untested but converted version of the shader if that helps.

Thanks for your time.
J

 

I will send a solution, soon.

 

Project was sent.

 

could you send me this solution? thanks a lot! sbfhhh@gmail.com

 

Download:

https://mega.nz/file/ppR1WCSA#G1ZPDID-w2euJQoGo5eBBDIu7zTJd31niz9K8YCE0lA