[UnityShader3]波浪效果

参考链接:http://blog.csdn.net/stalendp/article/details/21993227


效果图:

[UnityShader3]波浪效果_第1张图片


1.首先,实现格子背景图

Shader "Custom/Curve"
{
	Properties
	{
		_BackgroundColor ("BackgroundColor", Color) = (1, 1, 1, 1)
		_BackgroundColor2 ("BackgroundColor2", Color) = (0, 0, 0, 1)
		_Space ("Space", Range(0, 1)) = 0.2
		_XOffset ("XOffset", Range(-1, 1)) = 0.15
		_YOffset ("YOffset", Range(-1, 1)) = 0.05
	}
	SubShader
	{
		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{			
				float4 vertex : SV_POSITION;
				float2 uv : TEXCOORD0;
			};

			//格子背景
			fixed4 _BackgroundColor;
			fixed4 _BackgroundColor2;
			fixed _Space;
			fixed _XOffset;
			fixed _YOffset;

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.uv = v.uv;

				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				//fmod(x, y):x/y的余数,和x有同样的符号	
				//step(a, x):如果x=a,返回1

				//得到一个小于_Space的余数,即a的范围为[0, _Space)
				fixed a = fmod(i.uv.x + _XOffset, _Space);
				//有1/2概率返回0,有1/2概率返回1,从而形成间隔效果
				a = step(0.5 * _Space, a);

				fixed b = fmod(i.uv.y + _YOffset, _Space);
				b = step(0.5 * _Space, b);

				return _BackgroundColor * a * b + _BackgroundColor2 * (1 - a * b);
			}
			ENDCG
		}
	}
}

[UnityShader3]波浪效果_第2张图片


2.在中间添加一条直线

Shader "Custom/Curve"
{
	Properties
	{
		_BackgroundColor ("BackgroundColor", Color) = (1, 1, 1, 1)
		_BackgroundColor2 ("BackgroundColor2", Color) = (0, 0, 0, 1)
		_Space ("Space", Range(0, 1)) = 0.2
		_XOffset ("XOffset", Range(-1, 1)) = 0.15
		_YOffset ("YOffset", Range(-1, 1)) = 0.05
	}
	SubShader
	{
		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{			
				float4 vertex : SV_POSITION;
				float2 uv : TEXCOORD0;
			};

			//格子背景
			fixed4 _BackgroundColor;
			fixed4 _BackgroundColor2;
			fixed _Space;
			fixed _XOffset;
			fixed _YOffset;

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.uv = v.uv;

				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				//fmod(x, y):x/y的余数,和x有同样的符号	
				//step(a, x):如果x=a,返回1

				//得到一个小于_Space的余数,即a的范围为[0, _Space)
				fixed a = fmod(i.uv.x + _XOffset, _Space);
				//有1/2概率返回0,有1/2概率返回1,从而形成间隔效果
				a = step(0.5 * _Space, a);

				fixed b = fmod(i.uv.y + _YOffset, _Space);
				b = step(0.5 * _Space, b);

				fixed4 bgCol = _BackgroundColor * a * b + _BackgroundColor2 * (1 - a * b);
				

				//范围(1, 51),乘上100是扩大差距(中间最亮其他两边基本不亮),加上1是防止0作为除数,同时确保最中间最亮
				float v = abs(i.uv.y - 0.5) * 100 + 1;
				v = 1 / v;
				fixed4 lineCol = fixed4(v, v, v, 1);

				return bgCol + lineCol;
			}
			ENDCG
		}
	}
}

[UnityShader3]波浪效果_第3张图片


3.直线变曲线

Shader "Custom/Curve"
{
	Properties
	{
		//调整背景
		_BackgroundColor ("BackgroundColor", Color) = (1, 1, 1, 1)
		_BackgroundColor2 ("BackgroundColor2", Color) = (0, 0, 0, 1)
		_Space ("Space", Range(0, 1)) = 0.2
		_XOffset ("XOffset", Range(-1, 1)) = 0.15
		_YOffset ("YOffset", Range(-1, 1)) = 0.05

		//调整曲线的波动
		_Frequency ("Frequency", Range(0, 100)) = 10//频率
		_Amplitude ("Amplitude", Range(0, 1)) = 0.1//振幅
		_Speed ("Speed", Range(0, 100)) = 10//速度
	}
	SubShader
	{
		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{			
				float4 vertex : SV_POSITION;
				float2 uv : TEXCOORD0;
			};

			//格子背景
			fixed4 _BackgroundColor;
			fixed4 _BackgroundColor2;
			fixed _Space;
			fixed _XOffset;
			fixed _YOffset;

			half _Frequency;
			half _Amplitude;
			half _Speed;

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.uv = v.uv;

				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				//fmod(x, y):x/y的余数,和x有同样的符号	
				//step(a, x):如果x=a,返回1

				//得到一个小于_Space的余数,即a的范围为[0, _Space)
				fixed a = fmod(i.uv.x + _XOffset, _Space);
				//有1/2概率返回0,有1/2概率返回1,从而形成间隔效果
				a = step(0.5 * _Space, a);

				fixed b = fmod(i.uv.y + _YOffset, _Space);
				b = step(0.5 * _Space, b);

				fixed4 bgCol = _BackgroundColor * a * b + _BackgroundColor2 * (1 - a * b);
				

				//范围(1, 51),乘上100是扩大差距(中间最亮其他两边基本不亮),加上1是防止0作为除数,同时确保最中间最亮
				//float y = i.uv.y + sin(_Time.y);扫描线效果
				float y = i.uv.y + sin(i.uv.x * _Frequency + _Time.y * _Speed) * _Amplitude;//可以看成一条y的关于x的方程式
				float v = abs(y - 0.5) * 100 + 1;
				v = 1 / v;
				fixed4 lineCol = fixed4(v, v, v, 1);

				return bgCol + lineCol;
			}
			ENDCG
		}
	}
}

[UnityShader3]波浪效果_第4张图片

注释掉的是扫描线效果:

[UnityShader3]波浪效果_第5张图片


4.多曲线。其实就是for循环,然后在频率和振幅上加些变量,即可形成多条不同的曲线。

Shader "Custom/Curve"
{
	Properties
	{
		//调整背景
		_BackgroundColor ("BackgroundColor", Color) = (1, 1, 1, 1)
		_BackgroundColor2 ("BackgroundColor2", Color) = (0, 0, 0, 1)
		_Space ("Space", Range(0, 1)) = 0.2
		_XOffset ("XOffset", Range(-1, 1)) = 0.15
		_YOffset ("YOffset", Range(-1, 1)) = 0.05

		//调整曲线的波动
		_Frequency ("Frequency", Range(0, 100)) = 10//频率
		_Amplitude ("Amplitude", Range(0, 1)) = 0.1//振幅
		_Speed ("Speed", Range(0, 100)) = 10//速度
	}
	SubShader
	{
		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{			
				float4 vertex : SV_POSITION;
				float2 uv : TEXCOORD0;
			};

			//格子背景
			fixed4 _BackgroundColor;
			fixed4 _BackgroundColor2;
			fixed _Space;
			fixed _XOffset;
			fixed _YOffset;

			half _Frequency;
			half _Amplitude;
			half _Speed;

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.uv = v.uv;

				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				//fmod(x, y):x/y的余数,和x有同样的符号	
				//step(a, x):如果x=a,返回1

				//得到一个小于_Space的余数,即a的范围为[0, _Space)
				fixed a = fmod(i.uv.x + _XOffset, _Space);
				//有1/2概率返回0,有1/2概率返回1,从而形成间隔效果
				a = step(0.5 * _Space, a);

				fixed b = fmod(i.uv.y + _YOffset, _Space);
				b = step(0.5 * _Space, b);

				fixed4 bgCol = _BackgroundColor * a * b + _BackgroundColor2 * (1 - a * b);
				

				//范围(1, 51),乘上100是扩大差距(中间最亮其他两边基本不亮),加上1是防止0作为除数,同时确保最中间最亮
				//float y = i.uv.y + sin(_Time.y);扫描线效果

				fixed4 lineCol;

				for(int count = 0;count < 3;count++)
				{
					float y = i.uv.y + sin(i.uv.x * _Frequency * count * 0.1 + _Time.y * _Speed) * (_Amplitude + count * 0.1);//可以看成一条y的关于x的方程式
					y = saturate(y);//重新映射到(0, 1)范围
					float v = abs(y - 0.5) * 100 + 1;
					v = 1 / v;
					lineCol += fixed4(v, v, v, 1);//注意是"+"操作,对颜色进行叠加
				}

				return bgCol + lineCol;
			}
			ENDCG
		}
	}
}


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