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【Unity】管道流动模拟Shader
抽象模拟管道介质流动的效果，使用顶点片元着色器。可以调整管线光泽，颜色，流动方向，透明度，流动体粗细，流动速度和横断面。
实现效果
Demo效果
Demo下载地址
管线光泽调整
管线颜色调整
流动方向调整
透明度调整
流动体粗细调整
管线横断
流动速度调整
shader源码
Shader "Unlit/PipeShaderTwoPass"
{Properties{_MoveTex("MoveTexture", 2D) = "white" {}_PipeTex("PipeTexture", 2D) = "white" {}_Color("Color",Color) = (1,1,1,0)[HDR]_MoveColor("MoveColor",Color) = (1,1,1,0)_CutVector("CutVector",Vector) = (0, 1, 0, 0)_CutCenter("CutCenter",Vector) = (0, 1, 0, 0)[Enum(Off,0,On,1)]_isCut("isCut",int) = 1[Enum(Off,0,On,1)]_isFront("isFront",int) = 1[Enum(Off,0,On,1)]_isMove("isMove",int) = 1_Alpha("Alpha",Range(0.85, 1.0)) = 1_Speed("Speed",Range(1, 3)) = 0.1_Metallic("Metallic", Range(0.0, 1.0)) = 0.5_Smoothness("Smoothness", Range(1.0, 2.0)) = 0.5_R("R",Range(0,1)) = 1}SubShader{Pass{Tags { "RenderType" = "Opaque" }LOD 100ZWrite OnCull Off //关闭剔除 CGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"sampler2D _MoveTex;float4 _MoveTex_ST;float4 _CutCenter;float4 _CutVector;float4 _MoveColor;int _isCut;int _isFront;int _isMove;float _Speed;float _R;struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;float3 normal : NORMAL;};struct v2f{float2 uv : TEXCOORD0;float4 vertex : SV_POSITION;float3 worldPos : TEXCOORD1;};v2f vert(appdata v){v2f o;o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;o.vertex = UnityObjectToClipPos(v.vertex - (v.normal * _R));o.uv = TRANSFORM_TEX(v.uv, _MoveTex);return o;}fixed4 frag(v2f i) : SV_Target{float2 uv = i.uv;if (_isFront){uv = float2(i.uv.x, -i.uv.y);}fixed4 col = tex2D(_MoveTex, uv - float2(0, _isMove * _Speed * _Time.y));if (_isCut == 1){float3 cutVector = normalize(_CutVector.xyz);//切割向量float3 targetVer = i.worldPos - _CutCenter;//切割原点到模型点上的向量float angel = -dot(cutVector, normalize(targetVer));//切割向量和targetVer点乘，正则同方向，父则反方向clip(angel);//反方向剔除}clip(col.x - 0.1);return col* _MoveColor;}ENDCG}Pass{Tags { "RenderType" = "Opaque" "IgnoreProjector" = "True" "Queue" = "Geometry" }LOD 100ZWrite OnCull Off //关闭剔除 Blend SrcAlpha OneMinusSrcAlphaCGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"#include "UnityLightingCommon.cginc" // 对于 _LightColor0struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;float3 normal : NORMAL;};struct v2f{float2 uv : TEXCOORD0;float4 vertex : SV_POSITION;float3 worldPos : TEXCOORD1;half3 worldNormal : TEXCOORD2;fixed4 diff : COLOR0; // 漫射光照颜色};sampler2D _PipeTex;float4 _PipeTex_ST;float4 _CutCenter;float4 _CutVector;int _isCut;fixed _Verical;float _Alpha;float4 _Color;float _Metallic;float _Smoothness;v2f vert(appdata v){v2f o;o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;o.vertex = UnityObjectToClipPos(v.vertex);o.uv = TRANSFORM_TEX(v.uv, _PipeTex);o.worldNormal = UnityObjectToWorldNormal(v.normal);half nl = max(0, dot(o.worldNormal, _WorldSpaceLightPos0.xyz) * 0.5 + 0.5);o.diff = nl * _LightColor0;o.diff.rgb += ShadeSH9(half4(o.worldNormal, 1));return o;}fixed4 frag(v2f i) : SV_Target{float2 uv = i.uv;fixed4 col = tex2D(_PipeTex, uv);if (_isCut == 1){float3 cutVector = normalize(_CutVector.xyz);//切割向量float3 targetVer = i.worldPos - _CutCenter;//切割原点到模型点上的向量float angel = -dot(cutVector, normalize(targetVer));//切割向量和targetVer点乘，正则同方向，父则反方向clip(angel);//反方向剔除}// 计算视图方向和反射矢量// 此处为每像素计算half3 worldViewDir = normalize(UnityWorldSpaceViewDir(i.worldPos));half3 worldRefl = reflect(-worldViewDir, i.worldNormal);// 与在先前的着色器中相同half4 skyData = UNITY_SAMPLE_TEXCUBE(unity_SpecCube0, worldRefl);half3 skyColor = DecodeHDR(skyData, unity_SpecCube0_HDR);fixed4 c = 0;c.rgb = skyColor * _Metallic;half4 endColor;endColor = fixed4(((_Color + c) * i.diff * _Smoothness).rgb, _Color.a);return fixed4(endColor.rgb, _Alpha);}ENDCG}}
}
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