Daniel sent us this one — he wants to talk about how Toy Story was actually animated, what it felt like to be an animator on that project, and whether it was really as groundbreaking at the time as it seemed to those of us watching it in theaters. And I think the short answer to that last part is: it was more groundbreaking than we knew, because we couldn't see the scaffolding.
You couldn't see any of it. The opening shot of Andy's room — that warm, lived-in diorama with the clouds painted on the wall and the toys scattered across the floor — every single object in that frame was a mathematical skeleton someone built by hand. There was no "import asset library." There was no asset library.
There was no "generate clouds." Somebody sat down and mathematically described a cloud.
Somebody mathematically described a cloud, and then waited four hours to see if it looked right. And here's the thing — if it didn't look right, they didn't just tweak a parameter slider. They went back into the code, adjusted the math, and submitted the whole thing to the render farm again.
You're not just an artist at that point. You're a sculptor who has to mix your own clay from raw minerals.
And the clay was different for every single object. The cloud was one mathematical problem. The carpet in Andy's room was a completely different mathematical problem. The way light bounced off Woody's plastic pull-string ring versus the way it scattered through Buzz's helmet visor — those were separate research questions that had to be solved by different people on different timelines, all converging on the same deadline.
Which brings us to the actual moment. Nineteen ninety-five. Jurassic Park had given us CGI dinosaurs two years earlier, but those were maybe six minutes of screen time sprinkled into a live-action film. Toy Story was the first movie where every single frame — all one hundred fourteen thousand two hundred forty of them — was born inside a computer. No film stock, no physical sets, no cameras. Just math and patience.
The thing most people don't realize is that Pixar had to invent the tools while making the movie. RenderMan — their rendering software that eventually won an Academy Award for Technical Achievement in nineteen ninety-three, two years before Toy Story even came out — was still being developed during production. The animation software the team used was something called MenV, short for Modeling Environment, and it was this hacked-together Unix system that didn't have an undo button.
You moved a control vertex on a character's face, and if you didn't like it, you either remembered where it was before or you reloaded from a saved file. Animators saved fifty-plus versions of a file per day just to have a trail of breadcrumbs back to something usable.
You're sculpting a performance, but the clay is numbers, and every time you touch it you risk breaking something you can't fix. How does that change the way you work? I mean, if I'm writing and I know I can hit undo, I'll try five different phrasings of a sentence without thinking twice.
It changes everything. It means you develop this almost superstitious relationship with your files. You save before every significant move. You keep a notebook next to the keyboard where you literally write down coordinate values before you change them, like a navigator plotting a course. Some animators developed a habit of closing their eyes and visualizing the change for thirty seconds before touching anything, because the cost of a mistake wasn't just wasted time — it was potentially losing something good you'd never find your way back to.
That's terrifying. And that's the daily experience we should dig into. What was it actually like to sit down at one of those SGI workstations and try to make Woody blink?
Let's start with the hardware, because it sets the ceiling for everything else.
Pixar used Silicon Graphics workstations running the Irix operating system. These machines had sixty-four megabytes of RAM. For context, the phone in your pocket right now probably has a hundred times that. A single frame of Woody's face — just the face, not the body, not the background — could take two to four hours to render. The final film required about eight hundred thousand machine hours total, running across a render farm of eighty-seven dual-processor SGI machines. It took roughly forty-five days of continuous rendering to produce the finished film.
Forty-five days of computers just...
And here's what I want to pause on — forty-five days is the render time if nothing goes wrong. If nobody catches a mistake. But of course people caught mistakes constantly. So you'd have these cascading re-render queues where fixing one frame in a sequence meant re-rendering the twelve frames around it to check continuity, and each of those took hours.
During those forty-five days, if someone noticed a mistake in frame eighty-three thousand, you had to fix it and re-render. There was no "preview in viewport." The animators worked with wireframe representations of their characters — just the mathematical cage, no surface, no texture, no lighting. They were animating skeletons and hoping the skin would look right when it came back from the render farm hours later.
They're essentially blind sculptors. They make a gesture, submit it to the machine, go get coffee, come back, see what they got.
And the gesture itself — let's talk about what "animating" actually meant. These weren't puppets you could grab and pose. Pixar used NURBS surfaces — that's Non-Uniform Rational B-Splines — which are mathematically smooth curved surfaces defined by control vertices, or CVs. To make Woody blink, an animator had to select somewhere between eight and twelve individual CVs on the eyelid curve and manually reposition each one to create the closed-eye shape, then do it again for the next frame, and the next.
A blink isn't a blink. A blink is a spreadsheet.
It's sculpting with a spreadsheet. And Woody's face alone had two hundred twelve animation controls. Buzz had two hundred fifteen. That sounds like a lot until you learn that modern Pixar characters — the toys in Toy Story Four from twenty nineteen — have over a thousand controls. The original Toy Story team deliberately limited themselves to around a hundred facial rigs per character.
Which sounds like a limitation, but I'd argue it's the reason those characters work.
This is the uncanny valley problem they solved without anyone realizing it at the time. If you give an animator a thousand controls for a face, the temptation is to animate every micro-expression, every tiny muscle twitch. And with a plastic toy, that reads as wrong — a toy's face shouldn't have the full expressive range of a human face. By limiting the rig to about a hundred controls, Pixar forced animators to communicate emotion through timing, through pose, through the squash-and-stretch principles they'd inherited from traditional animation.
The Luxo Jr.
The Luxo Jr. short from nineteen eighty-six — that little desk lamp hopping around, squashing down before a jump, stretching as it reached for a ball. It had no face. No eyes, no mouth. And yet audiences watched it and felt emotion. That short proved that expressive movement, not facial detail, was what made a character feel alive. That became the foundation for Woody's rubbery limbs, for Buzz's stiff plastic posture, for every performance choice in the film.
That's the thread that connects traditional animation to what Pixar was doing. People assume Toy Story was a computer science achievement first and an artistic one second. But the animators weren't all programmers. Many of them were traditional two-dimensional animators from Disney who had to learn three-dimensional software from scratch.
This is one of the biggest misconceptions about the film. The team wasn't a bunch of MIT graduates who decided to make a cartoon. The core animation team — twenty-seven animators total — included people who'd worked on hand-drawn Disney features. They brought a theatrical sensibility to the computer. John Lasseter himself came from Disney's animation program. He was trained by the Nine Old Men — the legendary animators who built Disney's visual language. When he directed Toy Story, he approached it like a theater director working with actors, not like a software project manager.
That's where the sweatbox comes in.
Every morning, the animators would gather in this small screening room — they called it the sweatbox, and the name tells you everything you need to know — and they'd screen the two or three seconds of animation each person had completed the previous day. Two or three seconds. An animator working a full week might produce three to four seconds of finished animation. That's it.
For context, Toy Story is eighty-one minutes long. That's four thousand eight hundred sixty seconds. Twenty-seven animators, each producing maybe three seconds a week. You do the math on that and you understand why the final six months of production involved eighty-hour weeks as standard.
In the sweatbox, Lasseter wouldn't give technical notes. He wouldn't say "the subsurface scattering on Woody's cheek looks off." He'd say things like "Woody wouldn't stand like that when he's jealous — he'd slump his shoulders and turn slightly away.The same kind of feedback a director gives an actor on a stage.
Which is remarkable when you remember that the "actor" is a wireframe skeleton on a screen.
The voice performances came first. Tom Hanks and Tim Allen recorded their dialogue in a sound booth, and then the animators received those audio recordings and had to match lip-sync frame by frame, by hand. There was no motion capture. No performance capture of the actors' faces. Every smirk, every raised eyebrow, every subtle shift in expression was keyed manually — an animator deciding "on this frame, Woody's lip corner moves up by this many units.
You're listening to Tom Hanks deliver a line with this specific emotional inflection, and you have to translate that into numbers that make a plastic cowboy's face move in a way that feels like it generated that sound. But here's what I wonder — how do you even train for that? If you're a traditionally trained Disney animator, you spent years learning to draw expressions on paper. Now suddenly you're typing coordinates. Is there a moment where it clicks, or is it just months of feeling like you're wearing oven mitts?
From the accounts I've read, it was months of feeling like you're wearing oven mitts. Traditional animators described it as losing their hands. When you draw, there's this direct line between your brain and the page — your wrist knows things your conscious mind doesn't. With the CV manipulation, every gesture had to be translated through this intermediate layer of mathematics. It was like learning to paint by describing colors to someone else over the phone.
"Make the eyebrow... No, sadder than that.
But what's fascinating is that after about a year, something flipped. Animators started reporting that they'd developed a new kind of muscle memory. Not in their drawing hand, but in their spatial reasoning. They could look at a wireframe and "feel" how the surface would deform, the way a potter can look at a lump of clay and see the bowl inside. The brain rewires itself.
You won't know if you got it right for four hours.
Let's talk about the camera, because that's another thing people don't think about. In a live-action film, you have a camera operator, a focus puller, a dolly grip. On Toy Story, the camera was a mathematical construct.
The virtual camera. You placed it in the three-dimensional scene by typing coordinates. The lens was a mathematical model — you specified focal length, aperture, the film back dimensions. Depth of field, motion blur, all of it had to be computed. And this is where RenderMan's architecture really shone. The REYES system — Renders Everything You Ever Saw — used micropolygon displacement to handle things like the scuffed texture on Buzz's spacesuit. Instead of painting a texture map onto a smooth surface, REYES could actually subdivide the geometry into tiny polygons smaller than a pixel, then displace them to create genuine surface roughness.
Buzz's spacesuit looks scuffed not because someone painted scuff marks on it, but because the surface itself is mathematically bumpy.
And that level of geometric detail was unprecedented. But it also meant that every single one of those micropolygons had to be calculated. For the balloon in the opening scene — the one with the star on it — that single object required twelve hundred NURBS patches to simulate the way latex stretches. Twelve hundred individual curved surfaces, all stitched together seamlessly, for one balloon that's on screen for maybe eight seconds.
The balloon was the most complex object in the entire film.
Not Buzz Lightyear with all his buttons and his helmet and his wings.
There's something almost poetic about that. The hardest thing to simulate was the simplest, most ephemeral object.
I think that's worth sitting with for a second, because it reveals something about the nature of computer graphics that's still true today. Hard surfaces are easy. A box, a table, a plastic space helmet — those are mathematically well-behaved. They have clean edges and predictable light interactions. But soft, organic, stretchy things — a balloon, a bedsheet, human skin — those are computational nightmares. Every time you see a beautifully rendered bedsheet in a modern animated film, you're looking at decades of accumulated research into cloth simulation. In nineteen ninety-five, that balloon was the bleeding edge.
When they needed to simulate rain — which they didn't in the first film, but it's a useful comparison — in Toy Story they had no particle system. When the sequel came around in nineteen ninety-nine, Pixar had developed particle systems that could simulate thousands of individual water droplets. But in nineteen ninety-five, if they'd needed rain, they would have faked it with transparent cylinders falling in front of the camera. It's a magic trick. The entire film is a magic trick built out of math.
The technical limitations explain the look. But they don't explain the soul. That came from the people.
The people were under extraordinary pressure. Twenty-seven animators. A thirty-million-dollar budget — which, for context, is roughly what a modern Pixar film spends on catering. Toy Story Four cost over two hundred million. The original film was made for a fraction of that, with a fraction of the team, on hardware that was absurdly underpowered by today's standards.
The constraint may have been the secret ingredient. When you can't iterate endlessly, you have to commit. When you only have a hundred facial controls, you have to make every one of them count. When a single frame takes four hours to render, you better be sure about what you're submitting.
There's a story about the claw machine sequence — the one where the little green aliens are inside the claw game. The claw itself was a single model with forty-seven moving parts. Animating it required writing custom scripts to simulate the claw's pneumatic grip, because there was no physics engine in the software. They had to fake physics through code, one joint at a time.
Which means someone on the team understood both animation and programming well enough to write a claw-grip simulator.
That hybrid skillset defined the early Pixar culture. You had traditional animators learning to think in three axes, and you had computer scientists learning about timing and anticipation and follow-through — the twelve principles of animation that Disney had codified decades earlier. The film exists at the intersection of those two disciplines, and neither one dominates.
There's another technical hack I love. The lighting in Sid's room — that creepy, shadowy atmosphere where the mutant toys live. To create that look, the lighting team used something called negative lights.
This is brilliant. Normally, a light in a three-dimensional scene adds illumination — it brightens surfaces. A negative light does the opposite. It subtracts light, creating pools of darkness that feel unnatural and unsettling. It was a hack. It wasn't physically accurate — light doesn't work that way in the real world. But it created exactly the emotional tone the scene needed.
It became standard practice across the industry afterward. A workaround becomes a technique.
Which is basically the story of the entire film. Workarounds becoming techniques. Let's talk about the "I Will Go Sailing No More" sequence — Buzz's devastating realization that he can't actually fly. There's a dolly zoom in that scene, where the camera pulls back while the lens zooms in, creating that vertigo effect where the background seems to warp around the character. In live action, that requires a physical camera rig with a zoom lens mounted on a dolly, and precise coordination between the two movements. In Toy Story, it was pure math. They just changed two numbers — the camera position and the focal length — in opposite directions, and rendered the result.
One of the most emotionally powerful shots in the film was, technically speaking, a spreadsheet formula.
A spreadsheet formula that took hours to resolve into an image. And when it came back from the render farm and they screened it in the sweatbox, someone probably cried. Because that's what happened on this film. Grown adults, technical wizards, weeping at a plastic spaceman realizing he's a toy.
The sweatbox culture is worth dwelling on, because it's almost the opposite of how creative work gets done now. Today you'd have a Slack channel, async feedback, people dropping notes into a Figma file at midnight. The sweatbox was everyone in one room, every single morning, watching each other's two seconds of work on a big screen, with the director giving notes in front of the whole team.
That sounds terrifying. And it was. But it also meant that the entire team had a shared understanding of what the film was supposed to be. There was no feature creep because Lasseter was in that room every day saying "this is the movie we're making, and here's how this shot serves that movie." Daily feedback loops with a clear creative vision at the center.
It's the opposite of design by committee. It's design by dictatorship, but a benevolent dictatorship where the dictator has genuinely good taste.
The dictator is giving acting notes, not technical notes. That's the key. The technology was always in service of performance. When an animator spent a week on three seconds of Woody trying to convince the other toys he's not threatened by Buzz, Lasseter wasn't checking the polygon count. He was asking "do I believe this character's emotional state right now?
Which loops back to something important. The film wasn't groundbreaking because of the technology alone. It was groundbreaking because the technology disappeared. Audiences in nineteen ninety-five weren't sitting there thinking "wow, those NURBS surfaces are really paying off." They were thinking "I am worried about whether Woody and Buzz are going to be friends.
That's the real achievement. Compare it to The Lion King from nineteen ninety-four, just one year earlier. The Lion King used Disney's CAPS system — Computer Animation Production System — for digital ink and paint, but every frame was still drawn by hand. It was the pinnacle of traditional animation. And then Toy Story arrives and it's not just a different technique — it's a different kind of storytelling, enabled by a different kind of tool. The camera can move through space in ways that hand-drawn animation couldn't easily replicate. The lighting can create mood with physical accuracy. The characters cast shadows.
The shadows aren't the point. The point is that Sid's room feels dangerous, and Andy's room feels safe, and the gap between those two emotional states is what drives the story.
Creating that gap required inventing computer graphics fundamentals on the fly. Subdivision surfaces, depth of field, motion blur — these are things that modern engines do automatically, but in nineteen ninety-five they were research papers being implemented for the first time in production. The team was reading academic computer graphics literature and turning it into working code while the clock was ticking on a theatrical release date.
What do we take from this, looking back from where we are now?
The first thing is the constraint-breeds-creativity lesson. Toy Story had no undo, slow renders, a hundred facial controls per character, and no physics engine. Every one of those limitations forced a creative decision. Animators couldn't noodle endlessly on micro-expressions, so they had to make bold, clear acting choices. They couldn't preview their work in real time, so they had to develop a strong internal sense of how a pose would read. The constraints weren't obstacles to creativity — they were the structure that creativity grew around.
Like a trellis. The plant needs something to climb.
And modern animators with unlimited tools — real-time ray tracing, infinite undo, physics engines, thousand-control facial rigs — they sometimes lose that discipline. When you can tweak forever, you do. When you can simulate anything, you simulate everything. And the result can be technically flawless and emotionally empty.
The musical equivalent of beige wallpaper.
Perfectly rendered beige wallpaper. The second takeaway is the sweatbox model. Daily feedback loops with a clear creative director prevented the film from wandering off in a dozen different directions. Every morning, twenty-seven animators got aligned on what mattered. In modern software development, we've got standups and sprints, but the creative intensity of the sweatbox — the willingness to put unfinished work in front of the whole team every single day — that's rare.
The third takeaway is what I'd call the Toy Story principle. Identify the three or four core constraints in your project and lean into them rather than fighting them. The film's magic came from embracing what the technology couldn't do. The limited facial rigs forced expressiveness through body language. The slow renders forced commitment. The small team forced everyone to understand everyone else's work.
If you're building software, or designing a game, or running a creative project, ask yourself: what are my version of a hundred facial controls? What's my four-hour render? What am I treating as a limitation that might actually be forcing me to make better decisions?
The things you're complaining about might be the things making your work good.
Which brings us to the uncomfortable question. As tools get easier, does the craft get harder?
Because now we have AI tools — Runway, Sora, the whole generation of text-to-three-dimensional systems — that can generate animation from prompts. Type "plastic cowboy looks jealous" and something appears. No control vertices, no sweatbox, no four-hour wait for a single frame. And the output looks... But it lacks something.
It lacks the thousand tiny intentional decisions that a human animator made while listening to Tom Hanks's vocal performance and thinking "he sounds hurt here, not angry — I need to drop the shoulder, not raise it." Every frame of Toy Story is dense with those decisions. They're invisible to the audience, but they accumulate into something that feels alive.
That's the open question. Pixar's next film, Elio, is using real-time ray tracing in Unreal Engine. The tools have completely flipped from the Toy Story era — what used to take four hours now happens instantly. But the core challenge remains exactly the same. How do you make a digital character feel like it has a soul?
The tools change. The sweatbox — whatever form it takes now — doesn't. You still need someone with taste saying "I don't believe this character right now." You still need animators who understand that a blink isn't just a mechanical eyelid movement — it's a tiny emotional beat that tells the audience what the character is thinking.
I think anyone who cares about making things should go back and watch Toy Story with new eyes. Not as a childhood memory, but as a monument to human patience. Every frame is a record of someone staying late at an SGI workstation, tweaking control vertices on a NURBS surface, waiting hours to see if they got it right, and then coming in the next morning to have their two seconds of work scrutinized by a room full of peers.
They did that a hundred fourteen thousand times.
They made a balloon out of twelve hundred mathematical patches.
Nobody watching the film noticed the balloon. Which is exactly the point. The highest achievement of all that technical labor was invisibility. You don't see the math. You see a kid's room, and toys that love each other, and a plastic spaceman falling with style.
Build me a chair nobody notices they're sitting in.
That's the brief. And twenty-seven animators with sixty-four megabytes of RAM pulled it off.
Now: Hilbert's daily fun fact.
Hilbert: In the nineteen fifties, amateur radio operators in Patagonia built shortwave transmitters from scavenged automobile parts, repurposing ignition coils as spark-gap oscillators to bounce signals off the Andes. The Spanish verb "chispear" — literally "to spark" — entered the local ham radio lexicon as slang for making a successful contact under improvised conditions.
"sparking" someone in Patagonia meant you MacGyvered a car part into a radio and it actually worked. And they were bouncing signals off mountains, which is basically using the Andes as a mirror.
Which, if you think about it, is not that different from what the Pixar team was doing — taking a tool built for one thing, repurposing it for something completely different, and hoping the signal gets through. Fake rain made of falling cylinders. A claw-grip simulator written in a weekend by someone who probably had no business writing physics code but did it anyway.
The throughline is improvisation under constraint. Whether you're in Patagonia with a car battery or in Point Richmond with an SGI workstation, the creative impulse is the same: I have these materials, I have this problem, and the official solution doesn't exist yet. So I'll build one.
I'm now going to spend the rest of the day wondering if I can build a transmitter out of my old sedan.
Please don't.
Thanks to Hilbert Flumingtop for that fact, and for somehow finding a way to connect spark plugs to etymology.
This has been My Weird Prompts. If you enjoyed this episode, leave us a review wherever you listen — it helps other people find the show. We're at myweirdprompts dot com for full episodes and show notes. Until next time.
Go watch Toy Story again. You'll see the math this time.
