That doesn't make it any less useful at all? I am very fond of abstractions and modularity. Two.js is a nice rendering component. You can easily add an input component on beside of it if need be.
Indeed! I just wanted to be clear and not over promise anything. If you're interested in make input components that talk with Two.js I recommend taking a peak at /src/shape.js and /src/vector.js this is where the bindings are created. I believe that this form of binding allows for a lot of creativity when it comes to visualizing positions.
