Shader之——高效率高度雾云海

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我是靠谱客的博主怕孤独白昼，这篇文章主要介绍Shader之——高效率高度雾云海，现在分享给大家，希望可以做个参考。

在网上研究了好长一段时间的高度雾，大概的方法分两种，一种是屏幕特效，一种是区域的模拟，都是需要开启相机的深度图，对移动端来说效率还是有一定的影响的，最后都放弃了。用我的野路子方法实现了个物体上的高度雾，远近雾，云海效果如图：

代码如下：

复制代码

Shader "scenes/FogSceneObj"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_DepthStartFog("StartFog",float) = 0
_DepthEndFog("EndFog",float) = 0.2
_FogColor("FogColor",Color) = (1,1,1,1)
_LineStartFog("LineStartFog",float) = 0
_LineEndFog
("LineEndFog",float) = 50
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#pragma multi_compile LIGHTMAP_OFF LIGHTMAP_ON
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float2 uvLM:TEXCOORD1;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
#ifdef LIGHTMAP_ON
half2 uvLM:TEXCOORD1;
#endif
float3 worldPos:TEXCOORD2;
fixed LineDistance : TEXCOORD3;
};
sampler2D _MainTex;
float4 _MainTex_ST;
fixed _DepthStartFog;
fixed _DepthEndFog;
fixed4 _FogColor;
fixed _LineStartFog;
fixed _LineEndFog;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
#ifdef LIGHTMAP_ON
o.uvLM = v.uvLM.xy*unity_LightmapST.xy + unity_LightmapST.zw;
#endif
o.LineDistance = distance(o.worldPos.xyz, _WorldSpaceCameraPos.xyz);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.uv);
#ifdef LIGHTMAP_ON
fixed3 lm = (DecodeLightmap(UNITY_SAMPLE_TEX2D(unity_Lightmap, i.uvLM)));
col.rgb *= lm;
#endif
fixed Depthfog =saturate( (i.worldPos.y - _DepthStartFog) / (_DepthEndFog - _DepthStartFog));
col.rgb = lerp(_FogColor.rgb, col.rgb, Depthfog);
fixed Linefog = saturate((i.LineDistance - _LineStartFog)/ (_LineEndFog - _LineStartFog));
col.rgb = lerp( col.rgb, _FogColor.rgb, Linefog);
return col;
}
ENDCG
}
}
}

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Shader "scenes/FogSceneObj"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_DepthStartFog("StartFog",float) = 0
_DepthEndFog("EndFog",float) = 0.2
_FogColor("FogColor",Color) = (1,1,1,1)
_LineStartFog("LineStartFog",float) = 0
_LineEndFog
("LineEndFog",float) = 50
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#pragma multi_compile LIGHTMAP_OFF LIGHTMAP_ON
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float2 uvLM:TEXCOORD1;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
#ifdef LIGHTMAP_ON
half2 uvLM:TEXCOORD1;
#endif
float3 worldPos:TEXCOORD2;
fixed LineDistance : TEXCOORD3;
};
sampler2D _MainTex;
float4 _MainTex_ST;
fixed _DepthStartFog;
fixed _DepthEndFog;
fixed4 _FogColor;
fixed _LineStartFog;
fixed _LineEndFog;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
#ifdef LIGHTMAP_ON
o.uvLM = v.uvLM.xy*unity_LightmapST.xy + unity_LightmapST.zw;
#endif
o.LineDistance = distance(o.worldPos.xyz, _WorldSpaceCameraPos.xyz);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.uv);
#ifdef LIGHTMAP_ON
fixed3 lm = (DecodeLightmap(UNITY_SAMPLE_TEX2D(unity_Lightmap, i.uvLM)));
col.rgb *= lm;
#endif
fixed Depthfog =saturate( (i.worldPos.y - _DepthStartFog) / (_DepthEndFog - _DepthStartFog));
col.rgb = lerp(_FogColor.rgb, col.rgb, Depthfog);
fixed Linefog = saturate((i.LineDistance - _LineStartFog)/ (_LineEndFog - _LineStartFog));
col.rgb = lerp( col.rgb, _FogColor.rgb, Linefog);
return col;
}
ENDCG
}
}
}