AI Keynote: Why Rotoscopy Is Resurging in Adult Animation

This text, generated using AI, accompanies the full webinar available on our Vimeo channel.

Rotoscopy in Animation
Nov 26 | 10:00—11:00 | Keynote

In a world often dominated by 3D CGI, there is a growing audience fatigue and a craving for the texture and “human error” that comes with more handcrafted approaches. This shift has fueled a resurgence in rotoscopy, a technique that is becoming a major phenomenon in contemporary adult and arthouse animation.

In a recent CEE Animation Experience webinar, Olga Zhurzhenko from Morefilm explored this fascinating medium. Whether you are a filmmaker or an animation enthusiast, understanding why this century-old method is making a comeback can change how you view the intersection of reality and art.

What Actually is Rotoscopy? (And What it Isn’t)

To understand the resurgence, we must first define the technique. Rotoscopy is the process of tracing the lines, form, and shape of a character and their movement frame by frame over reference footage. Historically, this was done by projecting images onto glass, a method patented by Max Fleischer in 1915.

It is distinct from Motion Capture.

While Motion Capture (MoCap) records data points of movement, rotoscopy records visual aesthetics and lines6. It captures weight, physics, and the nuances of movement through an artist’s drawing rather than just digital coordinates.

Essential Note: Rotoscopy is not a filter. Filters can be chaotic and make mistakes. Rotoscopy involves an artist interpreting the form by hand, which is a complex skill distinct from simply copying an image.

Why the Comeback? The Hunger for Realism

Producers and directors are turning to rotoscopy to bridge the gap between realism and the flexibility of animation. The primary reasons for choosing this technique include:

1. Capturing subtle performance: It conveys intricate human expressions and movements, such as dancing or fighting, which are difficult to recreate naturally in standard 2D or 3D.
2. Blending realities: It allows for the seamless mixing of archival footage with reenactments, or reality with dreams and fantasy.
3. Unique Visual Identity: It places human beings in their natural form into environments that might be impossible to recreate physically.

Case Studies: How Modern Masters Use the Medium

The lecture highlighted distinct approaches to the medium through several modern films.

1. Blending Fantasy and History: Apollo 10 1/2

This Hollywood production is a prime example of using rotoscopy to blend fantasy with reality¹⁴. The film integrates documentary footage—stylized to match the animation—alongside shot reference material, making the transition between the boy’s space fantasies and the historical reality of 1969 seamless.

2. The Painterly Approach: The Peasants

Following the success of Loving Vincent, the film The Peasants utilized a massive team of artists painting in oils.

• The Process: Unlike Loving Vincent, which used green screens, The Peasants was shot on location to capture the natural lighting and seasons of the village.
• The Artistry: In fast-moving scenes like fights, artists could not simply trace lines. Instead, they had to convey motion through “cloud-like textures,” shadows, and shapes of light, creating a fluid effect impossible to achieve with automatic filters.

3. The “Ethical” Workaround: Children on Fire

In the documentary Children on Fire, the director faced an ethical dilemma: he wanted to depict children injured in the war in Ukraine but could not film them or ask them to reenact traumatic events.

• The Solution: The team used a hybrid approach, rotoscopy actual documentary footage and blending it with reference material created via motion capture and 3D models.
• The Result: Artists drew over both the real footage and the 3D references, morphing them together so the viewer could not tell the difference, allowing the story to be told without re-traumatizing victims.

The Workflow: From Footage to Frame

A typical rotoscopy production pipeline generally follows these steps:

1. Shoot Reference Material: This can be filmed footage or created via mock-up and 3D layouts.
2. Edit and Lock: The edit must be finished and locked before animation begins.
3. Keyframes: Artists select and draw the key poses in each shot.
4. In-betweening: The frames between key poses are filled in.
5. Compositing: The final animation is put together.

 Pro Tips for Production

• Frame Rate: Working at 12 frames per second is often sufficient and helps reduce the workload.
• Prioritize the Face: While you can simplify buttons or clothing, the main character’s face and emotions must be traced precisely—sometimes even at 25 fps for close-ups—to maintain the human connection.
• Consistency is King: It is crucial to keep the same artist on the same shot. Switching artists mid-shot can change line thickness and cause a “jitter” effect, making it look like the wind is blowing indoors.

Q&A from the audience

Can I turn one actor into a totally different character?
No. If you shoot a specific person, you must be sure that is the person you want on screen. It is effectively impossible to use rotoscopy to turn a specific actor’s footage into a completely different human face; you are tracing the natural form, not creating a puppet.

Is there an industry-standard software?
There is no single industry standard. Different projects use different tools depending on their needs: The Peasants used Dragonframe, Rock Bottom used Toon Boom, and Apollo 10 1/2 used proprietary software called Rotoshop.

What about AI?
The future is likely a hybrid workflow. AI may soon be able to handle in-betweening while humans focus on keyframes. However, AI currently struggles to select the correct keyframes to convey complex human emotions, which remains the core strength of human artists.

Rotoscopy is resurging because audiences are looking for the unique texture and realistic human emotion that this technique provides. It allows for a specific kind of storytelling that pure 3D cannot replicate.

Ready to try it yourself?
You don’t need expensive software to start. For independent experimentation, Photoshop is a highly suitable tool. It allows you to import video and draw over it layer by layer, offering a great introduction to the patience and artistry required for this medium.