【游戏-unity】Shader实现渐变效果。为了让效果更加的酷炫，在一些场景中可能会用到渐变效果，本篇给大家分享下使用shader实现渐变效果

GradientDemo.shader

Shader"QQ/Gradient/Bias"  
{  
	Properties  
	{  
		_Color("Color",Color)=(.5,.5,.5,1)  
		_MainTex("Texture",2D)="white"{}  
		_Gradient("Gradient,x:slope,y:speed,zw:gradual",vector)=(-.1,5,.3,.01)  
	}  
		SubShader  
		{  
			Tags{"RenderType"="Transparent"  
			"Queue"="Transparent"  
			}  
			LOD100  
			Pass  
			{  
				ZwriteOff  
				BlendSrcAlphaOneMinusSrcAlpha  
				CGPROGRAM  
				#pragmavertexvert  
				#pragmafragmentfrag  
				#include"UnityCG.cginc"  
				structa2v  
				{  
					float4vertex:POSITION;  
					float2uv:TEXCOORD0;  
				};  
				structv2f  
				{  
					float4pos:SV_POSITION;  
					float2uv:TEXCOORD0;  
					float2local_uv:TEXCOORD1;  
				};  
				sampler2D_MainTex;  
				float4_MainTex_ST;  
				fixed4_Color;  
				float4_Gradient;  
				float_Speed;  
				v2fvert(a2vv)  
				{  
					v2fo;  
					o.pos=mul(UNITY_MATRIX_MVP,v.vertex);  
					o.uv=TRANSFORM_TEX(v.uv,_MainTex);  
					o.local_uv=v.uv;  
					returno;  
				}  
				fixed4frag(v2fi):SV_Target  
				{  
					_Speed+=_Time.x*_Gradient.y;  
					fixed4col=tex2D(_MainTex,i.uv);  
					_Speed+=_Gradient.x*i.local_uv.y;  
					floatgradient=i.local_uv.x-(_Speed%1.5);  
					gradient=gradient>0?  
						max(_Gradient.w-gradient,0)/_Gradient.w:  
						max(_Gradient.z+gradient,0)/_Gradient.z;  
					col.rgb=lerp(col.rgb,_Color.rgb,gradient);  
					returncol;  
				}  
				ENDCG  
			}  
		}  
}  

https://gameinstitute.qq.com/community/detail/128719

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