Hi Vaibhav,
You can model surrounding obstructions by getting creative with the exterior overhang elements that are available for each wall of the space. Play with the dimensions and offsets to see how this can work. The isometric and elevation should reflect where you have placed the element.
In an upcoming SPOT-Pro there will be new features relative to exterior geometry and more complex interior geometry options.
Regards,
Zack
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Zack Rogers, P.E., LEED AP BD+C
Daylighting Innovations, LLC
211 North Public Road, Suite 220