I made the mistake with my game http://zedzeek.com/designdoc/
of ‘upgrading’ to HDRP in 2018 only to find out a lot of things didnt work (yes I did make a backup first, like I always do but I made the mistake of not just going and using the backup), I manually changed all shaders back, after a few hours all was sweet again and vowed never to touch HDRP again in this project.
The problem is whenever I upgrade to a new version of unity in this case 2020.2 a lot of the materials/shaders have got the dreaded internal shader error and have turn pink, cause unity has ‘helpfully’ changed some of my materials into the HDRP materials, which requires a lot of time to fix afterwards.
How can I expunge HDRP totally from my system?
It really is a major PITA to fix all this every time I upgrade unity.
To start with. Unity by itself didn’t change anything.
So stop blaming Unity for your choice and inability to manage it.
We’ve all been there. I have done it many times too. Take it as a friendly tip.
You remove HDRP from your project once you remove the asset file from your project’s Graphics settings and remove the HDRP package using the Package Manager.
(For all my projects I have seen at least 10% performance benefit from using HDRP, but each project is different.)
The rest of the materials that you have not changed are not going to change themselves.
(General advice, usually we change all the materials we see in our level, so chances are those remaining as pink after such process, are not used at all. So you might as well ignore them, or even delete them if they are not related to anything. )
Since you made the mistake of not using the backup you had made, you have no other option at the moment but to manually change the materials. It really doesn’t take that long.
I have changed hundreds of materials in less than an hour.
Search by type in the Project folders:
Quickly go through the materials using the arrow keys and switch those remaining to their desired version. It should only take you a few minutes if you have less than 100 materials in your scene.
