3D graphics and animation — from model to rendering

The multimedia animator track in digital media often leads into the world of 3D graphics: models, materials, light and movement built completely from scratch in a program. Where a 2D drawing is finished when lines and colors are set, a 3D figure is a construction that must be built up in several layers before it can move believably.

§Modelling — building the form

Modelling is the process where a form is built from points, edges and surfaces — a polygon mesh. From a simple box or sphere, the object is shaped step by step until it looks like what you are aiming for, whether it is an object, a room or a figure. The more complex the object should look, the more polygons it typically requires — but more polygons also means more processing power to display and work with.

§Rigging — the skeleton behind the movement

Before a figure can be animated, it must have a rig: a digital skeleton of joints to which the model's surface is connected. Rigging makes it possible to bend an arm or twist a head without damaging the shape — much like a puppet's strings, but built into the model itself. A good rig is invisible to the viewer, but crucial for whether the animator can then create a believable movement.

§The 12 principles of animation

Much of what makes an animation appear alive stems from twelve principles that Disney animators Ollie Johnston and Frank Thomas described in the book 'The Illusion of Life' (1981), and which are still taught today — regardless of whether the animation is drawn by hand or built in 3D.

• 01Squash and stretch – form that is compressed and stretched gives weight and flexibility.
• 02Anticipation (staging) – a small opposite movement before the main action prepares the viewer.
• 03Staging – composition that clearly shows what is most important in the image.
• 04Straight ahead and pose to pose — two working methods: animate continuously frame by frame, or set key positions and fill in between.
• 05Follow through and overlapping action — parts of the figure (hair clothing) continue the movement after the main body stops.
• 06Arcs — natural movements follow curves not straight lines.
• 07Secondary action — smaller movements that support the main action without stealing focus.
• 08Timing — the number of frames per movement determines whether something feels heavy, light, fast or slow.
• 09Exaggeration—a slight exaggeration makes a movement more lively and readable than the fully realistic version.
• 10Solid drawing — figures must have volume and weight in space, even in 2D.
• 11Appeal — the character should be pleasant to look at and have a clear, legible personality.
• 12Slow in and slow out — movements accelerate and brake gradually, just like in the real world.

§Texture, light, and rendering

When the model is built and animated, it needs surface and light before it can be shown. Textures give the material color, gloss, and structure—wood, metal, skin, fabric. Lighting in a 3D scene works on the same principles as photography and film lighting: direction, hardness, and color temperature shape how the scene is perceived. Finally the scene is rendered—the computer calculates how light, materials, and geometry together look, frame by frame, and turns it into the finished image or clip.

§Where is 3D used in the trade?

3D is widely used: product visualisation showing a product before it is physically produced, architectural walkthroughs of buildings, character animation for ads and games, and visual effects in film and video. Common to all directions is that it requires patience — a good 3D production is built layer by layer, and shortcuts in modelling or rigging rarely come for free later in the process.

“A 3D figure doesn't become believable because it's technically advanced. It becomes believable because it moves according to the same rules our eyes already know from the real world.”

— Professional view on 3D animation in digital media.