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·Instead of use the value of toon ramp in the shader, this shader use saturate to combine shadow and light, and clamp the result between 0 and1;

·Use the texture with several circular gradients pattern, and get the half toon value from the texture value and screen position, then, combine shadow and light;

·If the lightness is brighter than the halftoon texture value, the pixel will be lighted, otherwise, the pixel will be shadowed.

Study reference

Toon Dot Shader
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