What software can be used for Shadow Impact Analysis?

• A. AutoCAD
• B. Rhino (with Ladybug/Honeybee) or SketchUp
• C. Revit
• D. Excel

Answer: (B)

Shadow impact analysis involves examining how shadows cast by a building move across a site and surrounding spaces over different times of day and throughout the year. To do this well you need software that can handle sun-path geometry, location-specific climate data, and visualization of shading and daylight effects.

Rhino with Ladybug/Honeybee (and SketchUp with similar capabilities) are ideal for this. They integrate sun position and climate data to generate accurate shadow maps, sun-path diagrams, and daylighting/solar irradiation results. You can set the exact geographic location, dates, and times, then see how shadows from your geometry evolve. This lets you compare design options quickly, understand peak shading periods, and optimize form, orientation, and surrounding impacts.

AutoCAD can model geometry and show basic shadows, but it isn’t built for comprehensive environmental analysis. Revit can do solar studies, but its capabilities aren’t as flexible or detailed for extensive shadow-impact simulations as the Rhino/SketchUp ecosystem with Ladybug/Honeybee. Excel isn’t suited for spatial shadow visualization or climate-based daylight analysis.