Issue with Atmospheric Scattering in play mode

Cesium for Unity
1

Hi,

I’m evaluating Cesium for Unity and created an HDRP project following the quick start. But I’m having issues with the atmospheric scattering in play mode.

While not in play mode, the game view looks correct:

C4U_0
C4U_01090×762 127 KB

After I hit play, it renders like this:

C4U_1
C4U_11094×748 44.5 KB

Using the frame debugger, I found the two draw calls that are having issues. The first one is the SubsurfaceScattering. It looks like this:

C4U_2
C4U_21097×743 142 KB

And the second issue happens in OpaqueAtmosphericScattering:

C4U_3
C4U_31096×743 44.6 KB

The draw calls look correct while not in play mode. I’m using version 1.21.0 of the plugin released Jan 2, 2026 with Unity 6000.0.58. Any hints on how to troubleshoot/fix the issue are appreciated.

2

Hi @eisen.montalvo, welcome to the community!

I’ve upgraded you past “new user” so hopefully you can post the images now. I’m not sure so far what might be happening, but hopefully seeing the images will give some ideas.

3

Thank you @Kevin_Ring. I have updated the post with all images. If you need me to post anything else, please let me know.