Morph Puppet Rig is a combination of hierarchy rig and Morph Tool in Toon Boom Harmony. The goal of the project is to animate efficiently by generating in-between drawings automatically using TBH’s Morph Tool. The boiling contour line is achieved by rendering the same sequence multiple times with different pencil textures. Consecutively, I used After Effects to cycle rendered image sequences. No additional coding is required.
Pose this hierarchy rig to match with pre-drawn key drawings. Re-draw necessary parts of the rig to ensure it matches with the key drawings. Use Morph Tools between the key poses to generate in-between frames automatically.