Unity3d《Shader篇》地球旋转上空悬浮云层

记得把纹理设置成Repeat

Shader "Custom/Earth" {

	Properties {

		_MainTex ("Base (RGB)", 2D) = "white" {}

		_CloudTex ("Base (RGB)", 2D) = "white" {}

	}

	SubShader {

	

		Pass{

		Tags { "RenderType"="Opaque" }

		LOD 200

		

		CGPROGRAM

		#pragma vertex vert

		#pragma fragment frag

		

		#include "UnityCG.cginc"

	

		sampler2D _MainTex;

		sampler2D _CloudTex;

		float4 _MainTex_ST;

		struct Input {

			float4 pos : SV_POSITION;

			float2 uv;

		};



		Input vert(appdata_base v)

		{

			Input output;

			output.pos = mul(UNITY_MATRIX_MVP,v.vertex);

			output.uv =  TRANSFORM_TEX (v.texcoord, _MainTex);

			

			return output;

		}

		

		half4 frag (Input i):COLOR

		{ 

			float2 uv = i.uv;

			uv.x=i.uv.x + -_Time*0.3;

			half4 col = tex2D(_MainTex,uv);

			

			float2 uv_cloud = i.uv;

			uv_cloud.x=i.uv.x+ -_Time*0.8;

			

			half4 tex_clouddDepth = tex2D(_CloudTex,uv_cloud);

			

			half4 col_cloud = float4(1,1,1,0)*(tex_clouddDepth.x);

			

			return lerp(col,col_cloud,0.5f);

			

		}

		ENDCG

		}

	} 

	FallBack "Diffuse"

}