Oh interesting:

So the short answer is - not in the demo, but yes in your own code

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The demo's model rendering is powered by load-collada-dae ( https://github.com/chinedufn/load-collada-dae ) which right now has a default shader (what you see in this demo) and very few options to manipulate that default shader (I'm still thinking about the API)

Planning to update load-collada-dae to allow the user to pass in their own shader (with non-constant shading if they so please)

But skeletal-animation-system works completely independently of whatever renderer you're using so you could swap out load-collada-dae with, say, regl or Three.js or your own custom library.