Enhance and customize the visual elements available in SketchUp. Integrate the plug-in for adding lighting sources and effects to your existing projects. Calculate and adjust the lighting model, backdrops, reflections, and other elements in real time. Save and preview editing results.
Downloading LightUp 4.2.3 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. This software was originally designed by Adam Billyard. The program is categorized as Photo & Graphics Tools. LightUp.exe is the common file name to indicate this program's installer. The most popular versions of the program are 4.2, 4.1 and 3.0.
From the developer:
LightUp is a plugin for SketchUp that adds realtime lighting of your model inside the SketchUp window. You can add light sources to your model, backdrops, reflections, and immediately see the results without exiting SketchUp. When its done, you can export your lit model to a compressed file containing your Model, textures and Scenes and share it with others using the free LightUp Player or LightUp Web Player.
You may want to check out more software, such as LightUp Player or Christmas Tree Light Up, which might be related to LightUp.