Hello, I am having a bit of an issue. I downloaded a huge model from the Sketchup warehouse and I am having trouble with lighting. I realized the problem stems from the fact that all the windows are flat, which is to say that they don't have volume. I could go through with the push/pull tool and select them one by one and double click but that would take an eternity (there are dozens of windows.) Is there a faster way of doing this? I wish there there was a plugin just that would take transparent surfaces and let you add volume to them if they were only single sided. Thank you in advance!