Alt click on a node connection automatically disconnect it from the other nodes. And there is some nodes which can be easily summoned by pressing a key and clicking at the same time. Like B+click will place a branch, and S+click a sequence.
If you're willing to compile it, Aseprite is a great option as well.
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Looking for an alpha pack? A couple of days ago, Cesar Correa López has released a huge set of tileable alphas for 3D projects, which can be used, for example, in Zbrush with the surface feature or as bump maps in any 3D project.
You could use the pack for different kinds of sci-fi projects. Any other thoughts? How would you use these alphas?
105 tileable surface alphas, perfect to use within Zbrush with the surface option or as bump maps for any 3D project.
You can get some free samples — 15 alphas, to be exact — on Gumroad here.