渐变纹理模拟光照

最新推荐文章于 2022-07-11 09:08:01 发布

原创最新推荐文章于 2022-07-11 09:08:01 发布 · 401 阅读

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本文介绍了一种使用Unity Shader来实现卡通风格渲染的方法。通过定义自定义着色器，利用两个纹理贴图：主纹理(MainTex)用于获取颜色，渐变纹理(RampTex)用于控制光照效果。该着色器在透明队列中渲染，并忽略投影，适用于多种光照类型。

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Shader "Custom/Toon" {
    Properties {
        _MainTex ("Main Tex", 2D) = "white" {}
        _RampTex("Ramp Tex",2D)=""{}
    }
    SubShader {
        Tags { "Queue"="Transparent" "IngnoreProjector"="True" "RenderType"="Transparent" }
        LOD 200

        CGPROGRAM
        // Physically based Standard lighting model, and enable shadows on all light types
        #pragma surface surf Toon alpha:fade nolighting

        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0

        sampler2D _MainTex;
        sampler2D _RampTex;
        struct Input {
            float2 uv_MainTex;
        };

        fixed4 LightingToon(SurfaceOutput s,fixed3 lightDir,fixed atten)
        {
            half NdotL = dot(s.Normal,lightDir);
            fixed4 col = tex2D(_RampTex,fixed2(NdotL,0.5));

            fixed4 c;
            c.rgb = s.Albedo*_LightColor0.rgb*col*atten;
            c.a = s.Alpha;
            return c;
        }
        void surf (Input IN, inout SurfaceOutput o) {

            fixed4 c = tex2D(_MainTex,IN.uv_MainTex);
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}