Computer Animation is animation created, manipulated or rendered using computational systems. It encompasses both two dimensional and three dimensional methods, including vector animation, digital frame based drawing, keyframe systems, procedural animation, skeletal animation, particle systems, simulations and computer generated imagery. The term is broader than 3D Animation because computer systems can produce animation in a two dimensional image space as well as a three dimensional environment. It is also broader than any single software package or workflow. Computer Animation fundamentally involves using computational representations and processes to construct changes over time, whether those changes are manually specified, algorithmically generated or produced through a combination of methods.
The development of Computer Animation began with early experiments in computer generated imagery and gradually expanded as computing power, display technology and graphics algorithms improved. Early systems were limited by processing power and often produced simple geometric imagery, but advances in raster graphics, vector graphics, rendering, storage and input devices allowed increasingly complex work. Digital animation eventually entered commercial film, television, advertising, games and interactive media. Personal computers and specialised graphics hardware further reduced the barriers to production. Modern systems can manipulate millions of geometric elements, generate physically based lighting and simulate complex phenomena, demonstrating how dramatically the technical scope of Computer Animation has expanded.
Computer Animation can use several mathematical and computational representations of movement. Keyframe systems store important states and calculate intermediate values through interpolation. Hierarchical rigs allow transformations to propagate through connected objects, while inverse kinematics can calculate joint configurations needed to place an end effector at a target. Procedural animation uses rules, expressions or algorithms to generate movement, while simulations calculate behaviour according to physical or designed models. Particle systems can generate large numbers of related elements such as sparks, smoke or debris. These approaches can be combined, allowing manually animated controls to influence procedural or simulated behaviour.
Two dimensional Computer Animation commonly represents images as pixels, vectors or layered assets. Vector systems describe shapes through mathematical paths, enabling scalable graphics and efficient transformations. Raster systems manipulate pixel based images and are well suited to painted or textured animation. Software can interpolate position, rotation, scale, colour and opacity between keyframes, reducing the need to manually create every intermediate state. Digital frame based animation can retain direct drawing control while gaining advantages in editing, copying, layering and compositing. These capabilities have made computer based 2D production compatible with both traditional drawing principles and modern automated workflows.
Three dimensional Computer Animation uses computational models of objects, environments, cameras and lights. Geometry can be constructed from polygons, curves, surfaces or other representations, while materials describe how surfaces interact with light. Character rigs provide controllable structures for deformation, and renderers convert scenes into images. Computer systems can also simulate cloth, fluids, particles, hair and physical collisions. These simulations are approximations based on mathematical models and parameters rather than guarantees of physical truth. Artists frequently alter simulation settings or combine simulation with manual animation because the most physically accurate result is not necessarily the most visually appropriate result.
Computer Animation has major applications in entertainment, games, engineering, architecture, education, medicine, scientific research, advertising and interface systems. In scientific contexts, animation can represent data or processes that change over time. In engineering, it can demonstrate mechanical operation or model proposed designs. In medicine, it can illustrate anatomy and procedures. In games, computational animation must often respond to player input in real time. In cinema, large quantities of animation can be rendered in advance. These applications illustrate the difference between animation intended for interactive execution and animation intended for precomputed playback.
One major characteristic of Computer Animation is editability. Digital assets can often be copied, transformed, reused, versioned and modified without physically rebuilding the entire scene. A camera can be changed after an animation has been created, a material can be adjusted across many objects and a character rig can be reused for multiple shots. However, digital flexibility does not eliminate production complexity. Software dependencies, file formats, hardware requirements, asset management, rendering time, compatibility problems and version control can create significant challenges. A highly editable project can also become technically complex when many interconnected assets and procedural dependencies accumulate.
Computer Animation is often confused with computer generated imagery, 3D Animation and digital animation, but these terms overlap rather than being exact synonyms. Computer generated imagery can include static images as well as animation, while 3D Animation is a particular spatial approach within the broader field of Computer Animation. Digital animation can include digitally produced animation methods that are not necessarily computer intensive in the same sense, while Computer Animation specifically emphasises computational creation or manipulation. Modern production increasingly combines hand drawn artwork, captured movement, physical footage, procedural systems, simulations and computer rendering. Computer Animation is therefore best understood as a broad technological category encompassing many methods of generating controlled visual change through computational processes.
