how to find the back-end for threejs plotting

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Hi guys-- I have been using sagemath for a while now primarily because I am extremely impressed with its back-end for 3d plots. I have been generating math-art for a while and haven't yet found another system that outputs such beautifully arranged plots. That said, there are some features that have not yet been implemented that I would like to do myself, but to do that, I first need to see how sagemath is actually coding its threejs back-end in the first place. Since I have relatively little experience actually searching through application source codes, I am unsure on how to find the code I am looking for. Can anyone either point me in the right direction or give me some assistance as to how to conduct my search?

Thanks a lot

J