Poly count
Their are lots of advantages to making 3d graphics compared to 2d graphics, however their are limitations to making 3d graphics which might not occur in 2d. For example, when creating 3d graphics yuo have to consider your poly count? Your poly count is the amount of poly’s being rendered per frame, you render your 3d graphics in a wire frame state first rather than shaded becasue it is much quicker. The poly’s are what make up the 3d object and the more complex and detailed the object the higher the poly count will be.
File size
Another problem with having a high poly count is that the file size will be very high, an this general means you will need a high quality CPU (Central processing unit) to render your work. The better the CPU the more poly’s it can handle and render at once so this gives you quicker work pace but this type of high end equipment has a high end price tag and is expensive so not everyone can afford this type of equipment.
http://bigcostas.wordpress.com/limitations-of-3d-poly-count-file-size-and-rendering-times/
Real-time rendering
Real-time rendering is one of the interactive areas of computer graphics, it means creating synthetic images fast enough on the computer so that the viewer can interact with a virtual environment. The most common place to find real-time rendering is in video games. The rate at which images are displayed is measured in frames per second (frame/s) or Hertz (Hz). The frame rate is the measurement of how quickly an imaging device produces unique consecutive images. If an application is displaying 15 frame/s it is considered real-time
http://en.wikipedia.org/wiki/Real_Time_rendering
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