【Unity Shader】摇摆的小草——顶点动画

原创

于 2017-03-23 16:52:58 发布 · 1.1w 阅读

CC 4.0 BY-SA版权

Shader 动画的主要点在坐标变换，代码：

Shader "Custom/Grass" {
	Properties {
		_MainTex ("Grass Texture", 2D) = "white" {}
		_TimeScale ("Time Scale", float) = 1
	}

	SubShader{
		Tags{"Queue"="Transparent" "RenderType"="Opaque" "IgnoreProject"="True"}
		Pass{
			Tags{"LightMode"="ForwardBase"}

			ZWrite Off
			Blend SrcAlpha OneMinusSrcAlpha
			Cull Off

			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc" 

			sampler2D _MainTex;
			half _TimeScale;

			struct a2v {
				float4 vertex : POSITION;
				float4 texcoord : TEXCOORD0;
			};
			
			struct v2f {
				float4 pos : SV_POSITION;
				float2 uv : TEXCOORD0;
			};


			v2f vert(a2v v){
				v2f o;
				float4 offset = float4(0,0,0,0);
				offset.x = sin(3.1416 * _Time.y * clamp(v.texcoord.y-0.5, 0, 1))  * _TimeScale;
				o.pos = mul(UNITY_MATRIX_MVP, v.vertex + offset);
				o.uv = v.texcoord.xy