I recently upgraded a project from Unity 2018 to 2019.4.7f1, and switched from the standard renderer to the Universal Render Pipeline. (I'm assuming URP isn't the issue here, but just in case) I had created particles that simulate speed lines by having some line particles that spawn in world space in front of a moving player, and by having Camera Scale set to 0.1 so that the camera zooms by the particles and they extend to give a feeling of speed. This used to work fine, but after upgrading I realized it isn't working anymore, and no particles are showing up at all. I found a couple threads mentioning that Stretched Billboard only worked if the particles themselves were moving. That didn't use to be the case, but I tried giving them a small initial velocity, and this did cause them to show up. However, no matter what values I use for Camera Scale or any of the other options, I can't seem to get the camera movement to have any impact on the particle scale. Am I missing something?