Hi @khaoula,
Maybe this post can be helpful for you. Ladybug Incident radiation for city scale models in one batch, p.2
- As I remember, you can have no context geometry
- Do you need to keep building IDs after conducting a calculation? If yes, it is a bit tricky, I saw here several topics on how to perform per-building analysis. I have been using the grafted geometry input, where every building goes in a separate branch - but it is a super long. There is another trick but it is a bit clumsy.