Su2ds is a Sketchup plug-in that’s been developed to facilitate the analysis of Sketchup geometry using Daysim. The plug-in allows users to specify all of the model information necessary to conduct a Daysim analysis and display the results of that analysis, all within Sketchup. A small manual describing the plug-in’s use can also be found at the below link.
To learn more and to download the plug-in for free go to here: http://code.google.com/p/su2ds/