I saw this post on the Rhino news blog that says DIVA 4.0 for Grasshopper contains the forward ray tracing photon mapping module by Roland Schregle:
I'm wondering where I can find this module in the DIVA plugin interface or if there are any tutorials available?
Ideally I'd like to conduct a study for a geometry I have looking at the effect of surface imperfections (i.e. roughness) on the reflected radiation profile from this geometry to a receiving surface and this ray tracer in DIVA could be really useful if it is in-fact implemented in the current version.
The Photon Map / forward raytrace module is only implemented into the Rhino toolbar at the moment, not Grasshopper. There are no tutorials available, but you can reach it under Metrics > Visualizations > Advanced Radiance Parameters > Run Photon Map. Two points for your study: