Background : a solution to reduce file size or 3D calculating

SketchUp Pro
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1

Hello everybody

I tried to create a 360 space background (editing style; photo mapped sphere; photo mapped cylinder).
When I launch the animation the program cuts shapes and show inside. That works fine (no section planes) without the background.

How can I create a 360 background without increase 3D calculating ?

Thanks for all your advice.

2

Some photos to explain my problem that appears too when shadows mode is on.

Shadows off :

Capture d’écran 2022-10-17 à 22.27.37
Capture d’écran 2022-10-17 à 22.27.373764×2364 901 KB

Shadows on

Capture d’écran 2022-10-17 à 22.31.31
Capture d’écran 2022-10-17 à 22.31.313764×2364 1.06 MB

What do you think about my problem ?