Hello,

I am attempting to run a quick daylight visualization but keep receiving an error that I can only interpret as there is not enough light entering the space I am analyzing. I ran the same model on Diva 3 and it was working fine. I have adjusted the time and removed layers without any positive results. attached is a screenshot of the error message

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Here is another error message.

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You may be right, especially if your view scene geometry is complex for Radiance to reverse raytrace.

Start your troubleshooting by increasing the number of ambient bounces (-ab parameter). From the first screenshot it appears you are only simulating with two bounces. If no rays are able to reach the camera in a given number of bounces DIVA and Radiance will throw an error. Try increasing -ab incrementally, or a try -ab 0 (direct sun only) at a time when you know direct light can enter the space.

Hi William,

This error usually means that no light is reaching your camera. Are you sure that there is a path for light to enter your space? Three things you can do to see the model in order to troubleshoot,

  1. Render the space from an outside view.
  2. Add -av 1 1 1 to the Radiance command line parameters. This creates fake light in order to see the scene.
  3. Make sure your camera location is not clipping through a wall by zooming in a little bit.

Best,

Alstan

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