14 Nov 2016, 07:44

@Pamela-Fraley I think there is no single definition of this term, and different artists may use it in different ways. The way I have been introduced to it, "rendering" refers to the painting of volumes - which is done through shadows, midtones and highlights (basically, the darkest, medium and lightest parts of an object exposed to the light). Through proper painting of these, you can achieve the feeling of a tri-dimensional object even if it is only a flat painting.
There are various ways of doing rendering and different levels of stylization can be applied to it. A "full rendering" for me is when you try to mimick what your eyes see as close as possible (photorealistic painting would be the extreme expression of that). But it can also be done in a very simplified minimalistic way (for example like in Lee White's paintings) or not at all (like in more design-driven work or in primitive styles). To give you a traditional example, Disney classics were typically done with rendered backgrounds and non-rendered characters (as the characters needed to be animated, there was no time and no possibility to render the light-and-shadow on them. The backgrounds were painted and used for a whole sequence, so they could be "rendered").
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There is a lot of terms associated with rendering of light and shadow that you may have heard - things like "core shadow", "cast shadow", "occlusion", etc... they all refer to the way you can paint with value to mimic the way light interacts with objects. I hope this helps!