First determine which camera has higher rendering depth
Rendering after camera with larger depth value
That is the depth option in the picture below
For cameras with higher depth, select depth only in the clear flags, which means that only objects at the selected level will be rendered.
For cameras with higher depth, use the culling mask below to select the level that needs to be post-rendered.
Low-depth cameras do not select this level to achieve the effect of multiple cameras rendering different levels.
