Guilin Sun
Ansys Employee
If I am correct, as far as I remember, the GDS output files output geometries in layers, and no mesh order information is recorded. In the "model "tree, The order of the geometries is important for the same mesh order: the second geometry will override the first geometry if they overlap. As an example, the ring will override the rectangle :

If your structure has complicated overlap, I would suggest that you may need to simplify them if possible, and make sure the imported GDS shows the original overlap.