Does it cause an issue when rendering your model if you have mesh objects overlapping like the top of the rocket over the fuselage?
Hi violetcrystal.
It is not a problem, when they overlap, as long as they do not occupy the exact same place.
The left cubes would sort of render with an average color where they overlap in Cycles, when you're lucky:
And Eevee would not know what to do:
Always try to avoid the situation on the left;)