Many of you are now getting into the evaluation part, and you might be finding that the analysis is quite slow sometimes. If you have 20,000 windows, and you try the analyse Sky View Factor, you will probably get the dreaded 'Memory Allocation' error...
So you need to reduce the number of surfaces. If you have a lot of surfaces, then you can actually just select a random sample to analyse. As long as the selection is random, the results will still be representative of all the surfaces. So in the case of 20,000 windows, you can analyse just 10% or 20%.
To help you do this, I have created a Random Delete node:
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