unity shader之岩浆瀑布

1.首先创建一个shader，代码如下：

// - Unlit// - 熔岩瀑布 透明材质，两层贴图，另加一张控制Alpha透明的贴图Shader "Game/Lava/Lava Fall No Lightmap Sine Transparent" {Properties {//基础贴图_MainTex ("Base layer (RGB)", 2D) = "white" {}//细节贴图_DetailTex ("2nd layer (RGB)", 2D) = "white" {}//控制Alpha透明的贴图_AlphaTex ("Alpha (A)", 2D) = "white" {}//基础贴图的X轴速度_ScrollX ("Base layer Scroll speed X", Float) = 0.0//基础贴图的Y轴速度_ScrollY ("Base layer Scroll speed Y", Float) = 0.25//细节贴图的X轴速度_Scroll2X ("2nd layer Scroll speed X", Float) = 0.0//细节贴图的Y轴速度_Scroll2Y ("2nd layer Scroll speed Y", Float) = 0.35//基础贴图的振幅和频率_SineAmplX ("Base layer sine amplitude X",Float) = 0.0_SineAmplY ("Base layer sine amplitude Y",Float) = 0.0_SineFreqX ("Base layer sine freq X",Float) = 0_SineFreqY ("Base layer sine freq Y",Float) = 0//细节贴图的振幅和频率_SineAmplX2 ("2nd layer sine amplitude X",Float) = 0.0 _SineAmplY2 ("2nd layer sine amplitude Y",Float) = 0.0_SineFreqX2 ("2nd layer sine freq X",Float) = 0 _SineFreqY2 ("2nd layer sine freq Y",Float) = 0//倍增基数_MultiplierBase ("Base Layer Multiplier", Float) = 1.5_Multiplier2nd ("2nd Layer Multiplier", Float) = 1.6}SubShader {//渲染队列为透明  忽略投影 渲染类型为透明Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }//Alpha混合  让源和目标颜色完全的通过Blend One One//两面显示 忽略灯光 不记录深度 雾为白色Cull Off Lighting Off ZWrite Off Fog { Color (0,0,0,0) }LOD 100CGINCLUDE//若不懂  请参考浅墨shader十#pragma multi_compile LIGHTMAP_OFF LIGHTMAP_ON//#pragma exclude_renderers molehill#include "UnityCG.cginc"sampler2D _MainTex;sampler2D _DetailTex;sampler2D _AlphaTex;//若有不懂  请参考：http://blog.csdn.net/a6627651/article/details/50545612float4 _MainTex_ST;float4 _DetailTex_ST;float4 _AlphaTex_ST;float _ScrollX;float _ScrollY;float _Scroll2X;float _Scroll2Y;float _MultiplierBase;float _Multiplier2nd;float _SineAmplX;float _SineAmplY;float _SineFreqX;float _SineFreqY;float _SineAmplX2;float _SineAmplY2;float _SineFreqX2;float _SineFreqY2;struct v2f {float4 pos : SV_POSITION;float4 uv : TEXCOORD0;};v2f vert (appdata_full v){v2f o;o.pos = mul(UNITY_MATRIX_MVP, v.vertex);o.uv.xy = TRANSFORM_TEX(v.texcoord.xy,_MainTex) + frac(float2(_ScrollX, _ScrollY) * _Time);o.uv.zw = TRANSFORM_TEX(v.texcoord.xy,_DetailTex) + frac(float2(_Scroll2X, _Scroll2Y) * _Time);o.uv.x += sin(_Time * _SineFreqX) * _SineAmplX;o.uv.y += sin(_Time * _SineFreqY) * _SineAmplY;o.uv.z += sin(_Time * _SineFreqX2) * _SineAmplX2;o.uv.w += sin(_Time * _SineFreqY2) * _SineAmplY2;return o;}ENDCGPass {CGPROGRAM#pragma vertex vert#pragma fragment frag//计算精度#pragma fragmentoption ARB_precision_hint_fastestfixed4 frag (v2f i) : COLOR{fixed4 o;fixed4 tex = tex2D (_MainTex, i.uv.xy);fixed4 alpha = tex2D (_AlphaTex, i.uv.xy);fixed4 tex2 = tex2D (_DetailTex, i.uv.zw);fixed4 alpha2 = tex2D (_AlphaTex, i.uv.zw);o = lerp(tex * alpha.a * _MultiplierBase, tex2 * alpha2.a  * _Multiplier2nd, alpha2.a * alpha2.r);return o;}ENDCG }}}

2.创建一个材质球，选择该shader，创建一个竖着的平面，将材质球附上去。

3.下面附上用到的图。

main：

detail：

alpha：