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Real-time computer graphics systems differ from traditional (i.e., non-real-time) rendering systems in that non-real-time graphics typically rely on ray tracing. In this process, millions or billions of rays are traced from the camera to the world for detailed rendering—this expensive operation can take hours or days to render a single frame.
RenderMan has much in common with OpenGL (developed by the now-defunct Silicon Graphics), despite the two APIs being targeted to different sets of users (OpenGL to real-time hardware-assisted rendering and RenderMan to photorealistic off-line rendering). Both APIs take the form of a stack-based state machine with (conceptually) immediate ...
Real-time rendering is used to interactively render a scene, like in 3D computer games, and generally each frame must be rendered in a few milliseconds. Offline rendering is used to create realistic images and movies, where each frame can take hours or days to complete, or for debugging of complex graphics code by programmers.
Virtual cinematography is the set of cinematographic techniques performed in a computer graphics environment. It includes a wide variety of subjects like photographing real objects, often with stereo or multi-camera setup, for the purpose of recreating them as three-dimensional objects and algorithms for the automated creation of real and simulated camera angles.
It's is the one responsible for the transformation of the prepared 3D scene into a 2D image or animation. 3D render engines can be based on different methods, such as ray-tracing, rasterization, path-tracing, also depending on the speed and the outcome expected, it comes in different types – real-time and non real-time, which was described above
Real-time rendering uses high-performance rasterization algorithms that process a list of shapes and determine which pixels are covered by each shape. When more realism is required (e.g. for architectural visualization or visual effects) slower pixel-by-pixel algorithms such as ray tracing are used instead. (Ray tracing can also be used ...
The model of the graphics pipeline is usually used in real-time rendering. Often, most of the pipeline steps are implemented in hardware, which allows for special optimizations . The term "pipeline" is used in a similar sense for the pipeline in processors : the individual steps of the pipeline run in parallel as long as any given step has what ...
Real-time video editing is a system of editing video where it takes no longer to render a video than the length of that video clip itself. Live video editing is where there are various cameras at various angles and position, capturing single or multiple subjects and the footage is routed through a vision mixing device and edited and transmitted in real-time.