I am working on software (Ruby - Sketchup) to calculate the radiation (sun, sky and surrounding buildings) as part of urban development at the pedestrian level. The ultimate goal is to create a contour map showing the level of total radiation. With full radiation, I mean short-wave (light) and long-wave (heat). (To give you an idea: http://www.iaacblog.com/maa2011-2012-digitaltools/files/2012/01/Insolation-Analysis-All-Year.jpg )
I know that there are several existing programs that do this, but I need to write my own, because this calculation is only part of a more complex workflow.
The (obvious) pseudo code is as follows:
Select and mesh surface for analysis
From each point of the mesh
Cast n (see below) rays in the upper hemisphere (precalculated)
For each ray check whether it is in shade
If in shade => Extract properties from intersected surface
If not in shade => Flag it
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https://www.lucidchart.com/documents/view/5ca88b92-9a21-40a8-aa3a-0ff7a5968142/0