Can I add shadows based on a specific time of day in SketchUp?

ByCADbrief Staff

Short Answer

Yes, you can add shadows based on a specific time of day in SketchUp by using the Shadows panel and setting the date and time manually. This is the most common professional method for studying sun position in architectural models. Shadow accuracy still depends on correct model geolocation and north orientation.

What You Need to Know Before

Warning: If your SketchUp model does not have the correct geolocation, time zone, or north direction, the shadows may look believable but be technically wrong. This often causes inaccurate solar studies for site planning, façade analysis, or client presentations.

How to Add Time-of-Day Shadows in SketchUp

  • Command: Shadows

  • Shortcut: No default keyboard shortcut

  • Quick Steps:

    1. Go to Window > Shadows (or Default Tray > Shadows on Windows) to open the Shadows panel.
    2. Turn on the Display Shadows checkbox, then set the Time slider to the required time of day.
    3. Adjust the Date field if needed, and make sure your model location is set under File > Geo-location for accurate sun direction.

Variables & Settings

  • Key Setting: Display Shadows

  • Expert Setting: This toggle controls whether SketchUp shows real-time sunlight and cast shadows in the model view. For reliable results, also verify the Use sun for shading option and confirm the model’s geolocation and north alignment.

Why it Fails

  • Cause 1 (Geometry): Faces may be reversed, grouped incorrectly, or hidden inside other geometry, which can make shadows appear broken or visually inconsistent.

  • Cause 2 (layers/Locks): Hidden tags, locked groups, or hidden context geometry can prevent key objects from casting or receiving visible shadows during review.

  • Cause 3 (Command/Logic): The time-of-day shadow study will be inaccurate if the model has no geolocation or the building orientation does not match true north.

Quick Fix & Best Practice

  • Quick Fix: Open the Shadows panel, enable Display Shadows, then set the correct Date and Time after confirming Geo-location and model north orientation.

  • Manager’s Verdict: Use SketchUp shadows for fast conceptual sun studies and presentation views, but verify location and orientation before using them for design decisions or client-facing solar analysis.

FAQ

Can SketchUp animate shadows through the day?

Yes, you can adjust the time slider manually or create scenes at different times for a shadow study sequence.

Do I need geolocation for accurate shadows in SketchUp?

Yes, geolocation is the standard way to make time-based shadows match a real site.

Can I save a shadow setup in a scene?

Yes, SketchUp scenes can store shadow settings, including date, time, and shadow display state.

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