How do I model complex geometry?

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I have been trying to teach myself OpenStudio for the past week or so, but am confused on a few of the processes. What is the process for modeling complex geometry? All of the YouTube videos I've watched only show rectangles. My understanding is that E+ cannot handle geometric information beyond a rectangle. I have tried dividing spaces into rectangles but the opening between the spaces is modeled as a wall, which blocks the sun load between the spaces. Any tips or pointers would be appreciated, I'm having a hard time finding a response with Google searches. Thanks