UnityShader玉石效果

效果：

代码：

Shader "MyShader/Jade"
{
    Properties
    {
         _DiffuseColor("漫反射颜色",color)=(1,1,1,1)
        _ThicknessMap("厚度图",2d)="white"{}
        _AddColor("叠加颜色",color)=(1,1,1,1)
        _CubeMap("环境贴图",Cube)="white"{}
        _RotateAngle("环境贴图旋转偏移",Range(0,360))=0
        _BackLightContrast("透光对比度",float)=1.0
        _BackLightScale("透光亮度",float)=1.0
        _Distort("扭曲程度",Range(0,1))=1
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            Tags{"LightMode"="ForwardBase"}
            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fwdbase

            #include "UnityCG.cginc"
            #include "AutoLight.cginc"
            #include "Lighting.cginc"

            float _BackLightContrast;
            float _Distort;
            float _BackLightScale;
            sampler2D _ThicknessMap;
            samplerCUBE _CubeMap;
            float4 _CubeMap_HDR;
            float _RotateAngle;
            float4 _DiffuseColor;
            float4 _AddColor;

            float3 Rotate(float3 v,float rotateAngle)
            {
                float rad = rotateAngle*UNITY_PI/180.0;
                float2x2 rotateMul = float2x2(cos(rad),-sin(rad),sin(rad),cos(rad));
                float2 rotate_dir = mul(rotateMul,v.xz);
                return float3(v.x,rotate_dir.y,v.z);
            }

            struct appdata
            {
                float4 vertex : POSITION;
                float2 texcoord : TEXCOORD0;
                float3 normal : NORMAL;
            };

            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 normal_world : TEXCOORD1;
                float3 pos_world : TEXCOORD2;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv = v.texcoord;
                o.normal_world =normalize( mul(v.normal,unity_WorldToObject).xyz);
                o.pos_world = mul(unity_ObjectToWorld,v.vertex).xyz;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                half3 normal_world = normalize(i.normal_world);
                half3 view_dir = normalize(_WorldSpaceCameraPos.xyz-i.pos_world);
                half3 light_dir = normalize(_WorldSpaceLightPos0.xyz);
                //漫反射
                half NdotL = saturate(dot(normal_world,light_dir));
                half3 diffuse_term = NdotL*_DiffuseColor*_LightColor0.xyz+_AddColor.xyz;
                //透射光
                half3 back_dir = -normalize(light_dir+normal_world*_Distort);   //透射方向
                half VdotBL = saturate(dot(view_dir,back_dir));
                half thickness = 1.0-tex2D(_ThicknessMap,i.uv).r;
                half back_light = saturate(pow(VdotBL,_BackLightContrast))*_BackLightScale;
                half3 backlight_term = back_light*_LightColor0.xyz*thickness;
                //环境光
                half3 hdr_reflect_dir = normalize(reflect(-view_dir,normal_world));
                half3 rotate_hdr_reflect_dir = Rotate(hdr_reflect_dir,_RotateAngle);
                half frensil = 1-saturate(dot(normal_world,view_dir));
                float4 hdr_color = texCUBE(_CubeMap,rotate_hdr_reflect_dir);
                half3 env_color = DecodeHDR(hdr_color,_CubeMap_HDR)*frensil;
        

                half3 final_color = backlight_term+env_color+diffuse_term;
                return fixed4(final_color,1.0);
            }
            ENDCG
        }
        Pass
        {
            Tags{"LightMode"="ForwardAdd"}
            Blend One One
            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fwdadd

            #include "UnityCG.cginc"
            #include "AutoLight.cginc"
            #include "Lighting.cginc"

            float _BackLightContrast;
            float _Distort;
            float _BackLightScale;
            sampler2D _ThicknessMap;

            float3 Rotate(float3 v,float rotateAngle)
            {
                float rad = rotateAngle*UNITY_PI/180.0;
                float2x2 rotateMul = float2x2(cos(rad),-sin(rad),sin(rad),cos(rad));
                float2 rotate_dir = mul(rotateMul,v.xz);
                return float3(v.x,rotate_dir.y,v.z);
            }

            struct appdata
            {
                float4 vertex : POSITION;
                float2 texcoord : TEXCOORD0;
                float3 normal : NORMAL;
            };

            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 normal_world : TEXCOORD1;
                float3 pos_world : TEXCOORD2;
                LIGHTING_COORDS(3,4)
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv = v.texcoord;
                o.normal_world =normalize( mul(v.normal,unity_WorldToObject).xyz);
                o.pos_world = mul(unity_ObjectToWorld,v.vertex).xyz;
                TRANSFER_VERTEX_TO_FRAGMENT(o);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                half3 normal_world = normalize(i.normal_world);
                half3 view_dir = normalize(_WorldSpaceCameraPos.xyz-i.pos_world);
                half3 light_dir = normalize(_WorldSpaceLightPos0.xyz);

                //透射光
                half3 back_dir = -normalize(light_dir+normal_world*_Distort);   //透射方向
                half VdotBL = saturate(dot(view_dir,back_dir));
                half thickness = 1.0-tex2D(_ThicknessMap,i.uv).r;
                half back_light = saturate(pow(VdotBL,_BackLightContrast))*_BackLightScale;
                half3 backlight_term = back_light*_LightColor0.xyz*thickness;

                half3 atten = LIGHT_ATTENUATION(i);

                half3 final_color = backlight_term*atten;
                return fixed4(final_color,1.0);
            }
            ENDCG
        }
    }
}