From drawing to a body
A character in a 3D game starts as an idea, usually a drawing or a written description. Turning it into something that stands, runs and reacts inside a game involves several separate jobs, often handled by different specialists. The sequence is broadly modeling, texturing, rigging, skinning and animation, followed by integration into the game itself.
Studios organise this differently, and tools change over time, so the details below describe the general approach rather than a fixed recipe.
Concept art
Before any 3D work begins, concept artists usually produce drawings that set the character’s shape, outfit, colours and personality. Often there are views from the front, side and back, so that the 3D artist knows what the figure looks like from every angle. These drawings also settle practical questions, such as whether a cape will need to move or whether the character has to fit a particular style shared with the rest of the game.
3D modeling
In 3D modeling, an artist builds the character’s shape in software. The surface of a model is typically made from a mesh: many points (vertices) joined by edges into small flat faces, usually triangles or four-sided shapes. More faces allow smoother curves and finer detail, but they also cost more for the computer to draw.
Artists commonly work in one of two ways, or combine them.
- Box or polygon modeling builds the shape by adding and adjusting faces directly, which gives close control over the mesh.
- Digital sculpting treats the form like clay, allowing fine details such as wrinkles, scars or fabric folds.
A detailed sculpt often has far too many faces to run in a game in real time. A common solution is to build a simpler version of the model and carry the detail over from the sculpt using images. This is why the shape of the mesh matters: a game character must be detailed enough to look right but light enough to be drawn many times per second, alongside everything else on screen.
Retopology and UV mapping
When a high-detail sculpt is converted into a lighter model, artists rebuild the surface with a cleaner, more efficient arrangement of faces, a task called retopology. A good layout has lines that follow the way the body bends, such as around the elbows, knees and mouth, so the model deforms smoothly later.
Next comes UV mapping. The 3D surface is unwrapped into a flat layout, rather like cutting open a cardboard box, so that flat images can be applied to it. Each point on the model is linked to a position on those images.
Texturing and materials
Textures are the images that give the surface its look. They can describe colour, but also how shiny or rough a surface is, and small-scale bumps that catch light. Together with settings called materials, they tell the game engine how skin, metal, cloth or leather should respond to light. Which engine is used affects the exact setup, one reason what game engines do is relevant to character art.
Stylised games may use hand-painted textures with simple shading. Realistic games usually combine more layers of information. Either way, artists tend to check the character under different lighting, since a surface that looks good in a modelling program can look different in a game level.
Rigging
A static model cannot move. Rigging adds an internal skeleton made of joints, often called bones, arranged much like a real body: spine, limbs, hands, head. A rigger sets up how the joints connect and what movement each is allowed, so an elbow bends in one direction and a shoulder rotates more freely.
Rigs often include controls that make animators’ work easier, such as handles that move a whole arm or foot at once. Faces can be rigged with extra joints or with stored facial shapes that blend between expressions.
Skinning
Skinning links the mesh to the skeleton. Each vertex is assigned weights that say how strongly it follows each nearby joint. Near an elbow, vertices may be influenced by both the upper and lower arm, so the surface bends instead of tearing or folding unnaturally. Setting these weights takes careful testing, because poor weighting produces stretched or collapsing shapes when the character moves into extreme poses.
Animation
With a rig in place, animators create movement. There are two broad sources:
- Hand animation, in which an animator poses the skeleton at key moments and the software fills in the frames between.
- Motion capture, in which the movements of a performer are recorded and then cleaned up and adjusted by animators.
Games need many short clips: idle, walk, run, jump, attack, get hit, and so on. Unlike film, the player controls the character, so clips must blend smoothly and respond quickly to input. Programmers and animators often build a system that selects and mixes clips depending on what the player is doing. Because these animations affect how quickly the character appears to respond, they interact with concerns about input latency.
Animation also has to respect the game’s rules. A sword swing, for instance, needs a believable look, but it also needs timing that the designers can balance and that players can learn to read.
Fitting into the game
Finally the character is brought into the game, where programmers and technical artists attach behaviour, sounds, effects and collision shapes. Collision shapes are simplified volumes used to detect contacts, because checking every face of a detailed mesh would be too slow. Performance limits shape many of these decisions: a team will usually set a budget for how many faces, bones and textures a character may use, and may supply simpler versions that appear when the character is far away.
Testers then check that the character looks and moves correctly in every situation, a task that falls under quality assurance. Clipping, where parts of a body or outfit pass through each other, and odd poses at the edges of animations are common things to catch.
Why it takes a team
A single character can involve a concept artist, modeler, texture artist, rigger, animator and technical artist, plus programmers and designers who decide what the character does. Small teams often combine roles, or use ready-made assets and simpler art styles to keep the workload realistic.