我认为这种shader能通过简单的方式呈现出不错的效果。
1.流光shader:
Shader "Unlit/StreamShader"
{
//流光shader
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_StreamTex("StreamTexture", 2D) = "white" {}
_StreamColor("StreamColor", Color) = (,,,)
_StreamStrength("StreamStrength", Float) =
_StreamSpeed("StreamSpeed", Range(,)) = 0.5
_EnvTex("EnvTex (CubeMap)", Cube) = "_SkyBox" {}
_EnvStrength("EnvStrength", Range(,)) = 0.8 }
SubShader
{
Tags { "RenderType"="Opaque" }
LOD Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag #include "UnityCG.cginc" struct appdata
{
float4 vertex : POSITION;
float4 normal : NORMAL;
float2 uv0 : TEXCOORD0;
float2 uv1 : TEXCOORD1;
}; struct v2f
{
float2 uv0 : TEXCOORD0;
float2 uv1 : TEXCOORD1;
float4 vertex : SV_POSITION;
float3 RefDir : TEXCOORD2;
}; sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _StreamTex;
float4 _StreamTex_ST;
half4 _StreamColor;
float _StreamStrength;
float _StreamSpeed;
samplerCUBE _EnvTex;
half _EnvStrength; v2f vert (appdata v)
{
v2f o;
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
o.uv0 = TRANSFORM_TEX(v.uv0, _MainTex);
o.uv1 = v.uv1; float3 worldN = UnityObjectToWorldNormal(v.normal);
o.RefDir = reflect(-WorldSpaceViewDir(v.vertex), worldN);
return o;
} fixed4 frag (v2f i) : SV_Target
{
// sample the texture
fixed4 col = tex2D(_MainTex, i.uv0);
//流光
float2 streamUV = i.uv1 + _Time.y * float2(_StreamSpeed, );//缩放时间控制速度
fixed4 steamCol = tex2D(_StreamTex, TRANSFORM_TEX(streamUV, _StreamTex));
float3 steam = _StreamColor * steamCol.r * _StreamStrength;
//环境贴图反射
float3 reflection = texCUBE(_EnvTex, i.RefDir).rgb * _EnvStrength;
float3 o = col.rgb + steam + reflection;
return fixed4(o, );
}
ENDCG
}
}
}
效果：
2.流光+扭曲shader：
Shader "Unlit/SteamAndWrapShader"
{
//流光+纹理扭曲shader
Properties
{
_MainTex("Texture", 2D) = "white" {}
_StreamTex("StreamTexture", 2D) = "white" {}
_StreamColor("StreamColor", Color) = (,,,)
_StreamStrength("StreamStrength", Float) =
_StreamSpeed("StreamSpeed", Range(,)) = 0.5
_EnvTex("EnvTex (CubeMap)", Cube) = "_SkyBox" {}
_EnvStrength("EnvStrength", Range(,)) = 0.8
_WrapSpeed("WrapSpeed", Float) =
_WrapStrength("WrapStrength", Float) =
}
SubShader
{
Tags{ "RenderType" = "Opaque" }
LOD Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag #include "UnityCG.cginc" struct appdata
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float2 uv0 : TEXCOORD0;
float2 uv1 : TEXCOORD1;
}; struct v2f
{
float2 uv0 : TEXCOORD0;
float2 uv1 : TEXCOORD1;
float4 vertex : SV_POSITION;
float3 RefDir : TEXCOORD2;
}; sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _StreamTex;
float4 _StreamTex_ST;
half4 _StreamColor;
float _StreamStrength;
float _StreamSpeed;
samplerCUBE _EnvTex;
half _EnvStrength;
half _WrapSpeed;
half _WrapStrength; v2f vert(appdata v)
{
v2f o;
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
o.uv0 = TRANSFORM_TEX(v.uv0, _MainTex);
o.uv1 = v.uv1; float3 worldN = UnityObjectToWorldNormal(v.normal);
o.RefDir = reflect(-WorldSpaceViewDir(v.vertex), worldN);
return o;
} fixed4 frag(v2f i) : SV_Target
{
// sample the texture
fixed4 col = tex2D(_MainTex, i.uv0);
//流光
float2 streamUV = i.uv1 + _Time.y * float2(_StreamSpeed, );//缩放时间控制速度
fixed4 steamCol = tex2D(_StreamTex, TRANSFORM_TEX(streamUV, _StreamTex));
float3 steam = _StreamColor * steamCol.r * _StreamStrength; //扭曲，是在主tex上呈现扭曲，所以用uv0，但扭曲所用的纹理是_SteamTex，所以采样_SteamTex
float2 wrapUV = i.uv0 + _Time.y * float2(-_WrapSpeed, _WrapSpeed);//缩放时间控制速度并扭曲uv
fixed4 wrapCol = tex2D(_StreamTex, TRANSFORM_TEX(wrapUV, _StreamTex));
float3 wrap = _StreamColor * wrapCol.r * _WrapStrength; //环境贴图反射
float3 reflection = texCUBE(_EnvTex, i.RefDir).rgb * _EnvStrength;
float3 o = col.rgb + steam + wrap + reflection;
return fixed4(o,);
}
ENDCG
}
}
}
效果：
总结：因为图片是我自己网上找的，所以流光和扭曲效果不好看，如果能针对性的做一些流光底图，会好看很多，结合扭曲就有流光溢彩之效了。