wow, 2-3 days of calculating?
i wonder how complex your building is, and/or if it needs to be that complex inside ecotect.

i've done lots of these types of analysis on 'complex' designs, but was able to dumb-down the unnecessary geometry in order to speed up the calculation time.

what type of machine are you running ecotect on?

best,
mike

I'm running a model now that has been calculating for more than 24 hrs. This is the first time I've used Ecotect for this, but I read all the information I could before hand. The solar radiation is only being calc'd on a few roofs that I dumbed down first. I hope I haven't done something wrong.

hmm...
i have the best results in both the calc and rendering performance when running the calc on a sub-divided grid from the Surface Subdivide tool and NOT the Analysis grid. (FYI) i usually only use the Analysis grid for interior calcs. don't know if either of you are using the Analysis grid or not, but i was having the worst results using it for exterior Solar Access calcs.

if you haven't already;
- try creating a grid on the face of the geometry in question.

- experiment with the size of the grid in relation to your expected analysis. the smaller the grid the longer the machine will take to make it work.

- keep the grid off of the geometry surface a small amount.

- make sure the normals are facing out.

- for your ref. i've attached an image showing one of my solar radiation studies/analysis with a Surface Subdivide over some complex geometry of a high rise project.

Kordou: i'm almost certain its not a cause of your machine. i've found ecotect is fairly a light load on a standard issue processor, be it AMD/Intel.

hope this helps!
and remember to make a back-up of your file before editing it.

-mike