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NPR tricks
Content Guide
Outline
Black outline
Inverse Hull Method
Variable Line Thickness On Inverse Hulls
Freestyle Mastery (WIP)
Shaders
Normal Spherizing using Abnormal
Manga shader collection
The most basic NPR shaders
Basic Matcap
Maintain falloff with different light hue
Color
Display the same color as picked
Isolate materials from world color
Normal editing
Normal Basics
Fixing dress edges shading
Fixing breast shading
Grease Pencil
Prevent GP Strokes From Clipping into a mesh
Modeling
Detailed curve hair
External Links
BlenderNPR
BEER/Malt wiki
Abnormal add-on wiki
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Inverse Hull Method
Inverse Hull Method / Backface Culling

The Inverse Hull Method is one of the easiest ways to get an outline around a Blender model. It is implemented by adding a "solidify" modifier and a second material with "backface culling" turned on. Under the wrench icon you can bring up the modifiers tab. Click add new modifier and add a solidify modifier.
Modifiers Icon
Now add two material, one for the base color and one for the outline. You need to add a second "material slot" by clicking the plus button to the right of the material. The base shader can be whatever type you want to use, but the backface should have an emission shader because it displays as a solid color and is unaffected by lights and shadows. Make sure to check the "Backface Culling" on the backface material.
The Solidify modifier need to have "flip" checked in the normals section, which reverses the normals so that the outside surface behaves as in internal surface. In other words, it is backfacing and backface culling removes it from the scene. Next set the material offset to 1. An offset of zero is the first material slot. This is useful is you decide to add more material shaders to the object because it lets you choose which material to use for the object's outline.
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Variable Line Thickness On Inverse Hulls
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