The Solar Radiation Technology Preview for Revit 2011 has just released on Autodesk Labs. This add-in allows you to understand and quantify solar radiation on various surfaces of your conceptual massing models. We have updated last year’s technology preview to make it faster, more tightly integrated with Revit 2011, and to show off the new Analysis Visualization Framework API for the first time. The add-in allows you to play with forms at the earliest stages of design and understand how they are affected by solar radiation. You can modify your mass form and immediately see the analysis update and understand how solar radiation effects your design over the course of a day or year by manipulating the sun path and watching the results update instantly . The free download is available on Labs and there is even a sample data set to play with. Please try it and tell us what you think.