u3d xray效果

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类似图中效果
这里写图片描述
plane屏幕扫过的部分可以看到球体中的内部结构，相当于透视眼，球体的其他部分正常
球和球体中的物体加shader

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'Shader "Custom/XRayShader"{    Properties    {        _MainTex("Texture", 2D) = "white" {}    _RayColor("RayColor", COLOR) = (0,0,1,0)    }        SubShader    {        Pass    {        Name "BASE1"        Tags{ "RenderType" = "Transparent" "Queue" = "Transparent" }        Blend One OneMinusSrcAlpha        Cull Back        ZTest Greater        ZWrite Off        CGPROGRAM#pragma vertex vert#pragma fragment frag        // make fog work#pragma multi_compile_fog#include "UnityCG.cginc"#include "Lighting.cginc"        struct appdata    {        float4 vertex : POSITION;        float2 uv : TEXCOORD0;        float4 normal : NORMAL;    };    struct v2f    {        UNITY_FOG_COORDS(0)            float4 vertex : SV_POSITION;        float2 uv : TEXCOORD1;        float4 diff : TEXCOORD2;    };    v2f vert(appdata v)    {        v2f o;        o.vertex = UnityObjectToClipPos(v.vertex);        o.uv = v.uv;        float3 worldNormal = normalize(mul(unity_ObjectToWorld, float4(v.normal.xyz,0)).xyz) * -1; //将法线转换到世界空间， * -1 是为了有外轮廓的效果，因此将法线翻转        float3 viewDirection = normalize(_WorldSpaceCameraPos); //将视野也转到相同的世界空间        o.diff = max(0, dot(viewDirection, worldNormal)); //计算视野和法线的夹角 将垂直的部分不填色        return o;    }    uniform float4 _RayColor;    fixed4 frag(v2f i) : SV_Target    {        _RayColor *= i.diff.x;    return _RayColor;    }        ENDCG    }        Pass    {        Name "BASE2"        Tags{ "RenderType" = "Opaque" }        ZWrite On        ZTest LEqual        CGPROGRAM#pragma vertex vert#pragma fragment frag        // make fog work#pragma multi_compile_fog#include "UnityCG.cginc"        struct appdata    {        float4 vertex : POSITION;        float2 uv : TEXCOORD0;    };    struct v2f    {        float2 uv : TEXCOORD0;        UNITY_FOG_COORDS(1)            float4 vertex : SV_POSITION;    };    sampler2D _MainTex;    float4 _MainTex_ST;    v2f vert(appdata v)    {        v2f o;        o.vertex = UnityObjectToClipPos(v.vertex);        o.uv = TRANSFORM_TEX(v.uv, _MainTex);        UNITY_TRANSFER_FOG(o,o.vertex);        return o;    }    fixed4 frag(v2f i) : SV_Target    {        // sample the texture        fixed4 col = tex2D(_MainTex, i.uv);    // apply fog    UNITY_APPLY_FOG(i.fogCoord, col);    return col;    }        ENDCG    }    }}

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