It lets its creator tweak serration and curvature in no time.
Check out this cool sword rig that allows one to easily customize the appearance of a stylized 3D blade model, showcased recently by 2D/3D Artist and Game Developer known online as ooxxex. Powered by shape keys, the setup makes it possible for the creator to tweak parameters like the serration and curvature of the blade, achieving different shapes in no time. According to the artist, the rig was built using Blender, a free and open-source software for 3D modeling, texturing, rendering, animation, and VFX.
Additionally, the artist demonstrated what would happen if you were to tweak both parameters at the same time:
And here's how it can be used to simulate the smear effect in 3D animation:
If you'd like to learn more about rigging in Blender, ooxxex also recommended Djambar's beginner-friendly tutorial discussing how to control shape keys with a single controller:
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