详解Unity使用ParticleSystem粒子系统模拟药水在血管中流动（粒子碰撞）

Shader "linxinfa/CustomTransShader" {
	Properties {
		_Color ("Main Tint", Color) = (1,1,1,1)
		_MainTex ("Main Tex", 2D) = "white" {}
		_AlphaScale("Alpha Scale",Range(0,1)) = 1
	}
	SubShader {
		Tags{"Queue" = "AlphaTest" "IgnoreProjector" = "True" "RenderType" = "Transparent"}
 
		Pass
		{
			Tags{"LightMode" = "ForwardBase"}
 
			Cull Front
 
			ZWrite Off
			Blend SrcAlpha OneMinusSrcAlpha
 
 
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "Lighting.cginc"
			#include "UnityCG.cginc"
 
			fixed4 _Color;
			sampler2D _MainTex;
			float4 _MainTex_ST;
			fixed _AlphaScale;
 
			struct a2v
			{
				float4 vertex : POSITION;
				float3 normal : NORMAL;
				float4 texcoord : TEXCOORD0;
			};
 
			struct v2f
			{
				float4 pos : SV_POSITION;
				float3 worldNormal : TEXCOORD0;
				float3 worldPos : TEXCOORD1;
				float2 uv : TEXCOORD2;
			};
 
			v2f vert(a2v v)
			{
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				o.worldNormal = UnityObjectToWorldNormal(v.normal);
				o.worldPos = mul(unity_ObjectToWorld,v.vertex).xyz;
 
				o.uv = TRANSFORM_TEX(v.texcoord,_MainTex);
 
				return o;
 
			}
 
			fixed4 frag(v2f i) : SV_TARGET0
			{
				fixed3 worldNormal = normalize(i.worldNormal);
				fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));
 
				fixed4 texcolor = tex2D(_MainTex,i.uv);
 
				fixed3 albedo = texcolor.rgb * _Color.rgb;
				fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz * albedo;
				fixed3 diffues = _LightColor0.rgb * albedo * max(0,dot(worldNormal,worldLightDir));
 
				return fixed4(ambient + diffues,texcolor.a * _AlphaScale);
			}
 
 
 
 
 
			ENDCG
		}
 
 
		Pass
		{
			Tags{"LightMode" = "ForwardBase"}
 
			Cull Back
 
			ZWrite Off
			Blend SrcAlpha OneMinusSrcAlpha
 
 
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "Lighting.cginc"
			#include "UnityCG.cginc"
 
			fixed4 _Color;
			sampler2D _MainTex;
			float4 _MainTex_ST;
			fixed _AlphaScale;
 
			struct a2v
			{
				float4 vertex : POSITION;
				float3 normal : NORMAL;
				float4 texcoord : TEXCOORD0;
			};
 
			struct v2f
			{
				float4 pos : SV_POSITION;
				float3 worldNormal : TEXCOORD0;
				float3 worldPos : TEXCOORD1;
				float2 uv : TEXCOORD2;
			};
 
			v2f vert(a2v v)
			{
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				o.worldNormal = UnityObjectToWorldNormal(v.normal);
				o.worldPos = mul(unity_ObjectToWorld,v.vertex).xyz;
 
				o.uv = TRANSFORM_TEX(v.texcoord,_MainTex);
 
				return o;
 
			}
 
			fixed4 frag(v2f i) : SV_TARGET0
			{
				fixed3 worldNormal = normalize(i.worldNormal);
				fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));
 
				fixed4 texcolor = tex2D(_MainTex,i.uv);
 
				fixed3 albedo = texcolor.rgb * _Color.rgb;
				fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz * albedo;
				fixed3 diffues = _LightColor0.rgb * albedo * max(0,dot(worldNormal,worldLightDir));
 
				return fixed4(ambient + diffues,texcolor.a * _AlphaScale);
			}
 
			ENDCG
 
	}
	}
		FallBack "Transparent/VertexLit"
}