toonshader in unity

7/25/2019 ToonShader in Unity

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Theory

Toon a.k.a cel shading is a non photorealistic rendering technique

Makes the 3D models appears in a style of cartoon, comic, hand-drawing.


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Stylized Specular Highlights

Plane white specular highlights with sharp boundaries

Compute the specular reflection term of the Phong shading modeland set a threshold. If greater than the threshold, set thefragment color to the specular reflection color times the(unattenuated) color of the light source.


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Stylized Diffuse Illumination

The diffuse illumination is stylized, consists of very few colors(depending on the number of cuts)

Set a threshold for the diffuse reflection term of the Phongreflection model. For example, when threshold is

0, use the full diffuse color, no unlit color

1, use full unlit color, no diffuse color0.5, half diffuse, half unlit

Anything in between = a combination of diffuse and unlit


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Characteristic Outline

Has outlines of specific color (usually black) along the silhouettes ofthe model

The outline is made from the model in question but scaled upwards,rendered in a single color, and it always shows on top of everythingexcept the object it is outlining.


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Standard shader vs Our toon shader


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Shader Properties


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First Pass of the Shader:struct vertexInput/vertexOutput


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First Pass of the Shader:Vertex shader


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First Pass of the Shader: fragment shaderAttenuation (directional light vs spotlight)


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First Pass of the Shader: fragment shaderSet colors and return fragmentColor


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Second Part of the Shader: Outline


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Questions?

Thank you for your attention!

toonshader in unity

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