In this tutorial, Supervising Animator and longtime Animation Mentor mentor Jason Martinsen breaks down how to animate character transformations and shape‑shifts, from subtle morphs to wild cartoony changes. He focuses on practical principles you can apply whether you work in 2D, 3D, or with heavy VFX support.
Meet Jason Martinsen
Jason Martinsen has been a professional animator since 2006 and is currently a supervising animator at Sunrise Productions. He previously worked at Framestore, Reel FX, Sony Imageworks, and Blue Sky Studios on film productions like Storks and Ferdinand. Other projects include Scoob!, Back to the Outback, Rumble and Monkey King. Jason mentors students in Animation Mentor’s Character Animation program.
You can learn more about Jason and his work here.
Core Ideas of Shape‑Shifting
Jason frames character transformations as a mix of animation principles and filmmaking tricks rather than a single technical solution. He highlights six recurring tools: shape changes, big pops, big proportion shifts, camera trickery, cutaways, and special effects.
Across examples from feature films, series, and shorts, he shows that the most successful transformations keep motion and silhouettes readable, even when the design is bending the rules with extreme smears or complex rigs.
Case Study: Beauty and the Beast 2D vs Live-Action VFX
Using the Beast’s transformation in the original Beauty and the Beast 2D animated feature, Jason explains traditional 2D morphing, where animators smoothly shift proportions from one design to another. The face scales from monstrous to human while fur, horns, and colors are gradually removed, then a white flash hides the final switch to the prince. He points out the anatomical thinking behind the beast-to-human foot: the “human heel” is positioned correctly first, then the lower leg elongates and claws retract as the foot morphs. Color fades and hair removal complete the illusion.
Comparing with the live‑action Beauty and the Beast, Jason notes that VFX teams lean heavily on swirling particles, bright flashes, and cross dissolves. The beast hand opens, a flash hits, and over a few frames it dissolves into a human hand, with the proportions largely staying in place. Here the transformation relies more on compositing and transparency wipes than on detailed anatomical morphing, showing how effects can “cheat” the transition while the camera and lighting sell the moment.
Cartoony Pops and Big Shape Changes
Hotel Transylvania: Transformania provides examples of exaggerated, poppy transformations. Jason walks through Johnny’s change into a monster: the butt scales up, a tail is added as a separate prop, and the body stretches and squashes in single-frame pops.
Multiple limbs, huge eyes, and rapidly scaling claws appear on smear frames as the rig is violently distorted before settling into the final monster model. The process mixes scaling, additive pieces, and extreme timing to make the change feel energetic and fun.
Hulk‑Style Transformations
Jason surveys several Hulk transformations, from 2D drawings to CG versions. Common ingredients are:
- Muscles bulging out and ripping clothes.
- Fast, jittery movement and camera shake to hide transitions.
- Tint changes to shift skin color after shapes are established.
He also shows a “reverse” Hulk moment where the character shrinks back to human scale using focus tricks, camera moves, and gradual muscle scaling, making the change feel like exhaustion rather than an explosion of power.
Transformers and Mechanical Shape‑Shifts
Transformers sequences represent a different class of transformation: mechanical folding and sliding. Jason analyzes shots where car and robot parts constantly rotate, slide, and stack, creating intentional visual chaos while still respecting final truck or robot silhouettes.
He describes “acrobatic transformations,” where the character does a flip or roll while changing, so the viewer is focused on the movement and pose flow rather than on the exact technical steps of every morphing piece.
Practical Approaches: Folding, Hiding, Revealing
Jason shows that many transformations are built on three basic actions: folding parts away, hiding them behind other forms, and revealing new parts from behind or inside the shape. This applies to toys, rigs, and hand‑drawn designs.
In Lego and similar sequences, animators tuck limbs in, rotate blocks, and keep reconfiguring pieces until they read as a new object, like a copier or a vehicle, often using lids or large panels as “curtains” to hide swaps.
Disney Shape‑Shifts and Cutaways
Looking at Disney classics like Pinocchio, The Emperor’s New Groove, Aladdin, and The Sword in the Stone, Jason highlights slower, staged transformations:
- Adding one new animal part at a time (ears, tail, hooves).
- Using shadows to show the transformation while keeping the character offscreen.
- Relying on smears, poofs of magic, and quick cuts so characters can appear already transformed when the camera returns.
He stresses that even when the design jumps from turtle to rabbit or human to llama in a single frame, the underlying movement and spacing stay consistent, which keeps the audience oriented.
Morph‑Heavy 2D Masterclass
Jason spends time on the short film Orgesticulanismus, built almost entirely around morphing dancers (a study in every‑other‑frame shape changes). The movement stays extremely consistent while proportions, costumes, and body types change every few frames.
Animators maintain continuity by:
- Carrying overlapping elements (hair, skirts, scarves) across designs.
- Grouping characters by similar proportions for a few frames (all big bodies, or all slim bodies) before switching types.
- Using smears, multiples, and exaggerated silhouettes to bridge extreme changes.
He calls it a masterclass in shape changes worth studying frame by frame for flow and proportion management.
Jason’s Own Transformation Shots
Jason shares several production examples from Hotel Transylvania films:
- Baby vampires transforming into bats, snakes, birds, and wolves using 3D rigs plus glowing eyes and capes, driven by strong anticipations and silhouette‑based pops.
- Dracula sprinting, leaping, and scaling down mid‑air as his cape turns pure black, then swapping to a bat rig at peak stretch while preserving the jump’s spacing.
In each case, he mixes rig scaling, rig swaps, and added rigs (like separate bat rigs) but keeps the core motion path continuous so the transformation feels like a single action.
Simple Maya Exercise: Transforming Primitives
To make the concepts concrete, Jason demonstrates a Maya exercise transforming a cube into a cone, cylinder, and sphere in a loop. He times squash‑and‑stretch actions so that during the most distorted frame, he swaps in the next object, using overshoots to hide the change.
He also shows variant transitions, like rotating a cylinder to line up with a sphere or building a “rounded cube” from multiple cubes as an intermediate frame before revealing the final sphere. The goal is to train your eye to plan shape flow and timing, not just rely on tools.
Practical Tips for Your Own Shape‑Shifts
Jason closes with practical advice you can apply on any transformation shot:
- Use big shape changes and strong silhouettes during the key transition frames.
- Keep movement and spacing continuous, even if the design changes radically.
- Don’t be afraid to use multiple rigs or bits of geometry to build transitional shapes.
- Lean on flashes, effects, shadows, camera cuts, and motion blur when you need to hide technical swaps.
He emphasizes that transformation shots are some of the most fun assignments an animator can get; if you approach them as puzzles in shape, timing, and flow, you can push your creativity while still keeping the action clear for the audience.
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