unity中景深（depth of field）的简单实现。。

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我是靠谱客的博主辛勤世界，最近开发中收集的这篇文章主要介绍unity中景深（depth of field）的简单实现。。，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

把脚本 MyDepthOfField.cs 挂到main camera，注意前面的钩打上。

using UnityEngine;
using System.Collections;

public class MyDepthOfField : MonoBehaviour {

    #region  come from ImageEffectBase.cs
    /// Provides a shader property that is set in the inspector
    /// and a material instantiated from the shader
    public Shader   shader;
    private Material m_Material;

    void OnEnable() {
        camera.depthTextureMode |= DepthTextureMode.Depth;
    }

    protected virtual void Start ()
    {
        // Disable if we don't support image effects
        if (!SystemInfo.supportsImageEffects) {
            enabled = false;
            return;
        }

        // Disable the image effect if the shader can't
        // run on the users graphics card
        if (!shader || !shader.isSupported)
            enabled = false;
    }

    protected Material material {
        get {
            if (m_Material == null) {
                m_Material = new Material (shader);
                //m_Material.hideFlags = HideFlags.HideAndDontSave;
                m_Material.hideFlags = HideFlags.DontSave;
            }
            return m_Material;
        }
    }

    protected virtual void OnDisable() {
        if( m_Material ) {
            //DestroyImmediate( m_Material );
            Destroy( m_Material );
        }
    }
    #endregion
    void OnRenderImage (RenderTexture source, RenderTexture destination) {
        //material.SetTexture ("_MainTex",source);
        material.SetFloat("focalDistance01", 0.0f); // 0--1 , or near plane to far plane.
        material.SetFloat("_OffsetDistance", 0.01f);
        Graphics.Blit (source, destination, material);
    }

}

把下面的shader拖到上面脚本的public参数中：

Shader "Custom/DoFShader" {
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
    }
    SubShader {
    Pass {
        ZTest Always Cull Off ZWrite Off
        //Fog { Mode off }

        CGPROGRAM
        #pragma vertex vert_img
        #pragma fragment frag
        //#pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"

        uniform sampler2D _MainTex;
        uniform sampler2D _CameraDepthTexture;
        uniform half _OffsetDistance;
        uniform half focalDistance01;

        fixed4 frag (v2f_img i) : COLOR
        {
            half blurFactor;
            half4 I = tex2D(_MainTex, i.uv);
            //fixed4 original = tex2D(_MainTex, i.uv);
            half4 C = tex2D(_MainTex, i.uv);
            C =tex2D(_MainTex,half2(i.uv.x+_OffsetDistance,i.uv.y+_OffsetDistance));
            C+=tex2D(_MainTex,half2(i.uv.x+_OffsetDistance,i.uv.y-_OffsetDistance));
            C+=tex2D(_MainTex,half2(i.uv.x-_OffsetDistance,i.uv.y+_OffsetDistance));
            C+=tex2D(_MainTex,half2(i.uv.x-_OffsetDistance,i.uv.y-_OffsetDistance));

            C+=tex2D(_MainTex,half2(i.uv.x+_OffsetDistance,i.uv.y));
            C+=tex2D(_MainTex,half2(i.uv.x,i.uv.y+_OffsetDistance));
            C+=tex2D(_MainTex,half2(i.uv.x-_OffsetDistance,i.uv.y));
            C+=tex2D(_MainTex,half2(i.uv.x,i.uv.y-_OffsetDistance));

            C*=0.125;
            //return C;
            float d = UNITY_SAMPLE_DEPTH ( tex2D (_CameraDepthTexture, i.uv) ); // i.uv.xy??
            d = Linear01Depth (d);
            blurFactor=saturate(abs(d-focalDistance01));
            //    blurFactor=saturate((IN.depth-_FocalDistance)*(IN.depth-_FocalDistance)*1.5);
            //    if(blurFactor<0.2)
            //        blurFactor*=blurFactor*3;
            //return fixed4(blurFactor);
                return lerp(I,C,blurFactor);
        }
        ENDCG

    }
}

Fallback off

}