Thursday, 16 May 2013

Real Time Rendering Explained

A crucial area of computer graphics centers on real time rendering. The meaning of real time rendering is the creation of synthetic images quickly enough on the computer for the interaction of viewers with virtual environments. Video games are the most common places for finding real time rendering. The rate at which the display of images takes place is measured in units of Hertz which actually is a measure of the number of frames per second. The frame rate measures the speed with which an imaging device creates consecutive unique images. If the application is displaying 15 frames per second, it is regarded to be in real time.

Next, we carry out the discussion about graphics rendering pipeline. The foundation of real-time graphics lies in the pipeline, whose primary function is to render or create, a two-dimensional image, given three dimensional objects, lighting models, lighting sources, textures and a visual camera.

There could be a threefold division of the conceptual stages of the architecture of the pipeline of a real time rendering application application, geometry and rasterizer. The structure is the core which is utilized in applications involving in real time computer graphics.

The stage of the application is controlled by the application where the generation of the image process commences, resulting in the last scene of animation frame. Hence, a creation of a base takes place and is filled with simple images. These are later built into clearer, larger images. The application is implemented upon the software, providing developers a complete control over its implementation, with an objective of altering the performance. Some of the processes involved within this stage are force feedback, speed-up techniques, collision detection and more. Collision detection involves algorithms which detect impending collisions between two objects. After the detection of a collision, a response might be generated and returned back to the colliding objects. With the end of the application stage, the geometry to be rendered is fed onto a subsequent stage in the pipeline.

The geometry stage is that stage where a large amount of per-point operations take place. This stage computes what is to be drawn and how it is to be drawn, also determining where the animations are to be drawn.

In the rasterizer stage, the elements which have been previously drawn and the transformed models are fed onto this stage. These elements are transformed into picture elements to which colors are added.

To execute these stages, a powerful computer network is needed. A render farm is a collection of computers, networked together to provide intensive computational power and memory. Fox Render Farm is a reputed online render farm which offers a remote render service using which you could submit rendering online in the cloud. They also offer a maya render farm wherein Maya software is used to perform the renderings.

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