Shader如何实现简单的波浪顶点动画效果
发表于2018-03-07
在游戏中也会运用到一些正弦余弦曲线，刚好发现可以用shader去实现，下面就来看看Shader是怎么用sin函数实现波浪顶点动画效果的。
（注：根据sin函数按照时间改变顶点坐标和颜色即可）
实现代码如下：
Properties
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_MainTex("Base ( RGB) ", 2D) = "white" ｛｝
_tintAmount("Tint Amount", Range(0, 1)) = 0.5
_ColorA("Color A", Color) = (1, 1, 1, 1)
_ColorB("Color B", Color) = (1, 1, 1, 1)
_Speed("Wave Speed", Range(0.1, 80)) = 5
_Frequency("Wave Frequency", Range(0, 5)) = 2
_Amplitude("Wave Amplitude", Range(-1, 1)) = 1
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SubShader｛
Tags｛ "RenderType" = "Opaque" ｝
Cull Off
CGPROGRAM
#pragma surface surf Standard vertex:vert
struct Input
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float2 uv_MainTex;
float3 vertColor;
｝;
sampler2D _MainTex;
float4 _ColorA;
float4 _ColorB;
float _tintAmount;
float _Speed;
float _Frequency;
float _Amplitude;
float _OffsetVal;
void vert(inout appdata_full v, out Input o)
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UNITY_INITIALIZE_OUTPUT(Input, o);
float time = _Time * _Speed;
float waveValueA = sin(time + v.vertex.x * _Frequency) * _Amplitude;
v.vertex.xyz = float3(v.vertex.x, v.vertex.y + waveValueA,
v.vertex.z);
v.normal = normalize(float3(v.normal.x + waveValueA, v.normal.y,
v.normal.z));
o.vertColor = float3(waveValueA, waveValueA, waveValueA);
｝
void surf(Input IN, inout SurfaceOutputStandard o)
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half4 c = tex2D(_MainTex, IN.uv_MainTex);
float3 tintColor = lerp(_ColorA, _ColorB, IN.vertColor).rgb;
o.Albedo = c.rgb * (tintColor * _tintAmount);
o.Alpha = c.a;
｝
ENDCG
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Fallback "Diffuse"