Unity打造玻璃效果的步骤

一、使用Cubemap，做一个假反射

shader代码如下:

登录后复制

Shader "Custom/glassShader" {  Properties {    _MainColor("Main Color",Color)=(1,1,1,1)    _MainTex ("Base (RGB)", 2D) = "white" {}    _Cube("Cube",CUBE)=""{}  }  SubShader {    Tags {"RenderType"="Opaque"}    LOD 200        //cull off    CGPROGRAM    #pragma surface surf Lambert alpha    fixed4 _MainColor;    sampler2D _MainTex;    samplerCUBE _Cube;    struct Input {      float2 uv_MainTex;      float3 worldRefl;    };    void surf (Input IN, inout SurfaceOutput o) {      half4 c = tex2D (_MainTex, IN.uv_MainTex);      o.Albedo = c.rgb*_MainColor.rgb;      o.Emission=texCUBE(_Cube,IN.worldRefl).rgb;      o.Alpha = c.a*_MainColor.a;    }    ENDCG  }   FallBack "Diffuse"}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.

二、使用GrabPass，抓取屏幕纹理,实现实时反射

shader代码如下:

登录后复制

Shader "Unlit/GrabGlass"{  Properties  {    _Color("Main Color",Color)=(1,1,1,1)    _MainTex ("Texture", 2D) = "white" {}  }  SubShader  {          Tags {"Queue"="Transparent" "RenderType"="Opaque" }//Opaque    LOD 100    //绘制半透明物体 关闭深度缓存    ZWrite Off    //透明混合    Blend SrcAlpha OneMinusSrcAlpha    //如果没有命名,则可以用_GrabTexture来读取,不过开销很大,应用到特殊效果时才去应用    GrabPass    {        "_GrabTex"    }    Pass    {      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;      fixed4 _Color;      sampler2D _GrabTex;      v2f vert (appdata v)      {        v2f o;        o.vertex = mul(UNITY_MATRIX_MVP, 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)*_Color;                // apply fog        UNITY_APPLY_FOG(i.fogCoord, col);         //调整一下uv        float2 uv=i.uv;         uv.x=1-uv.x;        return col*tex2D(_GrabTex,uv);      }      ENDCG    }  }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.

效果如下:

三、使用摄像机实现实时反射

因为GrabPass,相对来说消耗较大,只建议用于一些特殊效果，于是这里就借助辅助摄像机，来实现实时反射效果，当然这需要多写一个脚本，同时需要在辅助摄像机中屏蔽玻璃本身

shader代码如下:

登录后复制

Shader "Unlit/CameraGlass"{  Properties  {    _MainTex ("Texture", 2D) = "white" {}  }  SubShader  {    Tags { "RenderType"="Opaque" }    LOD 100    Pass    {      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 = mul(UNITY_MATRIX_MVP, 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  需要调整一下uv        fixed4 col = tex2D(_MainTex, 1-i.uv);        // apply fog        UNITY_APPLY_FOG(i.fogCoord, col);               return col;      }      ENDCG    }  }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.

脚本代码如下:

登录后复制

using UnityEngine;using System.Collections;public class RenderGlassTexture : MonoBehaviour {        /// <summary>    /// 辅助摄像机     /// 原理:就是将辅助摄像机所看到的内容渲染到玻璃物体上,所以就实现了实时反射的镜面效果    /// 因为玻璃也是场景中的物体,所以辅助摄像机也会看见他    /// 所以最好能将玻璃物体单独放在一个层级中,让辅助摄像机不去渲染他    /// </summary>    public Camera cam;    private RenderTexture renderTex;    /// <summary>    /// 玻璃shader    /// </summary>    public Shader glassShader;    /// <summary>    /// 玻璃材质    /// </summary>    private Material m_GlassMaterial;    protected Material GlassMaterial    {        get        {            if (m_GlassMaterial == null)            {                m_GlassMaterial = new Material(glassShader);            }            return m_GlassMaterial;        }    }    // Use this for initialization    void Start () {        renderTex = new RenderTexture(Screen.width, Screen.height, 16);        cam.targetTexture = renderTex;    }    //在摄像机开始裁剪场景之前调用    void OnPreCull()    {        GlassMaterial.SetTexture("_MainTex", renderTex);    }    //在相机完成场景渲染后调用    void OnPostRender()    {        GlassMaterial.SetTexture("_MainTex", null);    }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.

效果如下:

免责声明：本文系网络转载或改编，未找到原创作者，版权归原作者所有。如涉及版权，请联系删