(Case 1276894) Shadow popping on large objects beyond first shadow cascade

[CodeBison]

I’ve noticed shadow popping when shadow cascades are in use in 2020.2. Shadows beyond the first shadow cascade exhibit popping behaviour in scene or game camera. I created a video contrasting the behaviour with 2020.1.3f1, which behaves as expected:

Unity 2020.2 Shadow Popping

This behaviour only seems to occur with large shadow casters that extend past multiple sides of the camera frustum. The parts of the environment in the video linked above that exhibit this behaviour are all a single mesh, for example.

I’ve created a minimal repro project here: ShadowTest.zip - Google Drive
To reproduce issue with the provided project:

• Open ShadowTest scene

• Select camera and align scene camera via GameObject → Align View to Selected

• Note that only the first cascade of the cube’s shadow is visible in the scene camera:
  

  

• Select the cube and uniformly reduce its scale until the cube’s bounding box is only overlapping one plane of the camera’s frustum.

• Note that the cube’s shadow shows properly:
  

  

Edit: Filed as case 1276894

[Peter77]

@CodeBison

Edit: Filed as case 1276894

I was going to ask to submit a bug-report, then saw the edit. Great that you already did that!

BTW, if you add the bug-report case number to the thread title, it makes it easier to see the forum-post<>bug-report relationship. Like here for example:

[LeonhardP]

Hi @CodeBison ,

Thanks for your report! The issue has already been reproduced and will be forwarded to the devs. You’ll be able to track its status here: Unity Issue Tracker - Shape of the Shadow is not rendered properly when zooming in at the certain angle (might take a couple of hours until the link starts to work)