Browse Definitions :
Definition

CGI (computer-generated imagery)

Contributor(s): Matthew Haughn

CGI (computer-generated imagery) is the creation of still or animated visual content with imaging software. CGI is used to produce images for many purposes including visual art, advertising, anatomical modeling, architectural design, engineering, television shows, video game art and film special effects,  as well as augmented  reality (AR) and virtual reality (VR) applications.

CGI is accomplished through various methods. The use of algorithms to generate fractals, for example, can produce complex visual patterns. Other methods include painting in a 2D pixel-based image editor and creating shapes to make images, as in a vector-based image editor.

CGI can also be made from 3D graphics, either with ray tracing or by rasterized 3D graphics. Ray tracing simulates the way light acts upon surfaces on the level of photons, simulated by shader programming routines.  Ray tracing can use complex methods to build shapes, such as non-uniform b-spline (NURBS), 3D primitive shapes (such as cubes, spheres, pyramids, etc.) or simple polygons (typically triangles or quadrangles – which are often called quads). It may take seconds or even minutes per frame to render in these complex methods but results can be photorealistic.

Rasterized 3D, on the other hand, is specialized for real-time display of animated imagery as in computer and console video games. Due to the need to render multiple frames per second (ideally sixty or more), rasterized 3D uses simple polygons or quads to define shapes, with shaders more often consisting of textures that define the color, specularity, surface texture, glow and reflectivity.

Complex visuals may be made by combining computer-generated images into film in layers, a technique known as compositing. This technique is often used in conjunction with actors on a green screen, to place them in a simulated background.

See a breakdown of CGI visual effects in Harry Potter and the Deathly Hallows:

This was last updated in July 2016

Continue Reading About CGI (computer-generated imagery)

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

It can also be as simple as creating a graphical user interface. It amazing to see how far it's come in the last few years. I can only imagine the future.
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance as a service (CaaS)

    Compliance as a Service (CaaS) is a cloud service service level agreement (SLA) that specified how a managed service provider (...

  • data protection impact assessment (DPIA)

    A data protection impact assessment (DPIA) is a process designed to help organizations determine how data processing systems, ...

SearchSecurity

  • quantum key distribution (QKD)

    Quantum key distribution (QKD) is a secure communication method for exchanging encryption keys only known between shared parties.

  • identity theft

    Identity theft, also known as identity fraud, is a crime in which an imposter obtains key pieces of personally identifiable ...

  • cybercrime

    Cybercrime is any criminal activity that involves a computer, networked device or a network.

SearchHealthIT

SearchDisasterRecovery

  • disaster recovery plan (DRP)

    A disaster recovery plan (DRP) is a documented, structured approach that describes how an organization can quickly resume work ...

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • disaster recovery team

    A disaster recovery team is a group of individuals focused on planning, implementing, maintaining, auditing and testing an ...

SearchStorage

  • logical unit number (LUN)

    A logical unit number (LUN) is a unique identifier for designating an individual or collection of physical or virtual storage ...

  • NVMe over Fabrics (NVMe-oF)

    NVMe over Fabrics, also known as NVMe-oF and non-volatile memory express over fabrics, is a protocol specification designed to ...

  • CIFS (Common Internet File System)

    CIFS (Common Internet File System) is a protocol that gained popularity around the year 2000, as vendors worked to establish an ...

Close