Rendering

Once the lighting is completed the film is almost ready to move into pre-production, first of all however it has to be rendered. This process is where the computer takes over and begins to compute what you're animation is going to look at this. Dependant upon the size and detail of the animation, this process can be an extremely long winded one and at major animation companies such as Pixar this is done by a render farm, a bank of computers all working to render out the frames. The variously layers are usually rendered separately so that should something be found to have gone wrong it can be easily edited, however some companies do not bother with this in the hopes that everything has worked as intended. There are a number of different ways in which things can be rendered, naturally it's important to be able to render out basic versions of the animation, this allows you to ensure that they work correctly, there are no issues with the animation and everything is going to plan, they can also be shown to clients to ensure that they're happy with the final outcome. Once they have the go ahead then the rendering process to begin, there are a number of rendering softwares that allow for greater quality renders, quicker render times etc... Vray is one such programme, it allows the user to add a number of particle effects, dust, etc... to create ultra realistic, visually stunning rendered final pieces. The video at the top of this page is a demo reel showing things that have been produced by Vray and a number of top animators. Jobs in the rendering section of animation are often done by people who also specialise in other areas such as lighting, texturing etc ... The website below is a website for people to offer their jobs and for freelance animators to respond and offer to do, it has a number of jobs that involve 3D rendering, showing that there is a market for people in the field, despite the current economic climate. 
http://www.freelancer.co.uk/jobs/Rendering/