[Unity Shader]溶解效果

来源：互联网发布：nvidia windows xp 编辑：程序博客网时间：2024/04/28 00:03

一、效果

这里写图片描述

二、BurnToFadeOut.shader

Shader "BurnToFadeOut" {Properties {    _StartColor ("Start Color", Color) = (1,1,1,1)    _EndColor ("End Color", Color) = (1,1,1,1)    _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}    _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5    _Emit ("Emit level", Range(1,100)) = 0    _Range ("Range", Range(0,1)) = 0}SubShader {    Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}    LOD 100    Lighting Off    Pass {         CGPROGRAM            #pragma vertex vert            #pragma fragment frag            #include "UnityCG.cginc"            struct appdata_t {                float4 vertex : POSITION;                float2 texcoord : TEXCOORD0;            };            struct v2f {                float4 vertex : SV_POSITION;                half2 texcoord : TEXCOORD0;            };            sampler2D _MainTex;            float4 _MainTex_ST;            fixed4 _StartColor;            fixed4 _EndColor;            fixed _Cutoff;            half _Emit;            half _Range;            v2f vert (appdata_t v)            {                v2f o;                o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);                o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);                return o;            }            fixed4 frag (v2f i) : COLOR            {                fixed4 col = tex2D(_MainTex, i.texcoord);                fixed a = dot(col.xyz, fixed3(0.3, 0.59, 0.11));                col.a = a;                clip(a - _Cutoff);                if(a < _Cutoff + _Range)                    col.xyz = lerp(_StartColor.xyz, _EndColor.xyz, (saturate(a - _Cutoff) / _Range)) * _Emit;                return col;            }        ENDCG    }}SubShader {    Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}    LOD 100    Pass {        Lighting Off        Alphatest Greater [_Cutoff]        SetTexture [_MainTex] { combine texture }    }}}

三、使用

光晕效果需要把摄像机HDR打开并挂上这个脚本（Pro版导入Standard Asset里的）

@script ExecuteInEditMode@script RequireComponent (Camera)@script AddComponentMenu ("Image Effects/Bloom and Glow/Bloom (Optimized)")class FastBloom extends PostEffectsBase {    public enum Resolution {        Low = 0,        High = 1,    }    public enum BlurType {        Standard = 0,        Sgx = 1,    }    @Range(0.0f, 1.5f)    public var threshhold : float = 0.25f;    @Range(0.0f, 2.5f)    public var intensity : float = 0.75f;    @Range(0.25f, 5.5f)    public var blurSize : float = 1.0f;    var resolution : Resolution = Resolution.Low;    @Range(1, 4)    public var blurIterations : int = 1;    public var blurType = BlurType.Standard;    public var fastBloomShader : Shader;    private var fastBloomMaterial : Material = null;    function CheckResources () : boolean {         CheckSupport (false);          fastBloomMaterial = CheckShaderAndCreateMaterial (fastBloomShader, fastBloomMaterial);        if(!isSupported)            ReportAutoDisable ();        return isSupported;                }    function OnDisable() {        if(fastBloomMaterial)            DestroyImmediate (fastBloomMaterial);    }    function OnRenderImage (source : RenderTexture, destination : RenderTexture) {         if(CheckResources() == false) {            Graphics.Blit (source, destination);            return;        }        var divider : int = resolution == Resolution.Low ? 4 : 2;        var widthMod : float = resolution == Resolution.Low ? 0.5f : 1.0f;        fastBloomMaterial.SetVector ("_Parameter", Vector4 (blurSize * widthMod, 0.0f, threshhold, intensity));        source.filterMode = FilterMode.Bilinear;        var rtW = source.width/divider;        var rtH = source.height/divider;        // downsample        var rt : RenderTexture = RenderTexture.GetTemporary (rtW, rtH, 0, source.format);        rt.filterMode = FilterMode.Bilinear;        Graphics.Blit (source, rt, fastBloomMaterial, 1);        var passOffs = blurType == BlurType.Standard ? 0 : 2;        for(var i : int = 0; i < blurIterations; i++) {            fastBloomMaterial.SetVector ("_Parameter", Vector4 (blurSize * widthMod + (i*1.0f), 0.0f, threshhold, intensity));            // vertical blur            var rt2 : RenderTexture = RenderTexture.GetTemporary (rtW, rtH, 0, source.format);            rt2.filterMode = FilterMode.Bilinear;            Graphics.Blit (rt, rt2, fastBloomMaterial, 2 + passOffs);            RenderTexture.ReleaseTemporary (rt);            rt = rt2;            // horizontal blur            rt2 = RenderTexture.GetTemporary (rtW, rtH, 0, source.format);            rt2.filterMode = FilterMode.Bilinear;            Graphics.Blit (rt, rt2, fastBloomMaterial, 3 + passOffs);            RenderTexture.ReleaseTemporary (rt);            rt = rt2;        }        fastBloomMaterial.SetTexture ("_Bloom", rt);        Graphics.Blit (source, destination, fastBloomMaterial, 0);        RenderTexture.ReleaseTemporary (rt);    }  }

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