Doc:2.6/Manual/Render/Engines/Freestyle

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Freestyle

Freestyle is a render engine for creating Non-Photorealistic Line Drawing images from 3D scenes. It is designed as a programmable interface to allow maximum control over the style of the final drawing: the user "programs" how the silhouettes and other feature lines from the 3D model should be turned into stylized strokes using a set of programmable operators dedicated to style description.

Using Freestyle in Blender

See Here for documentation on using Freestyle in Blender.