Unity Shader实现跳动的心脏

本文主要是介绍Unity Shader实现跳动的心脏，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

之前没有学shader的时候，看着别人做出来的效果，感觉好厉害的样子。

最近几天在恶补shader，学了点皮毛后就发现，这东西简单的很...

不啰嗦，直接进入正题：

思路：

1，在shader中设置两个变量,_WidthFactor和_HeightFactor，用来接收脚本中传递的参数，计算顶点的扩张幅度

2，在脚本中设置两条曲线AnimationCurve,分别设置定点的扩张幅度

思路很简单，直接上代码

Shader：

Shader "MyShader/Effect/Heart"
{Properties{_MainTex ("Texture", 2D) = "white" {}_HeightFactor("HeightFactor",Range(0,0.5))=0_WidthFactor("WidthFactor",Range(0,0.5))=0.2}SubShader{Tags { "RenderType"="Opaque" }LOD 100Blend SrcAlpha OneMinusSrcAlphaPass{CGPROGRAM#pragma vertex vert#pragma fragment frag// make fog work#pragma multi_compile_fog#include "UnityCG.cginc"struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;};struct v2f{float2 uv : TEXCOORD0;UNITY_FOG_COORDS(1)float4 vertex : SV_POSITION;};sampler2D _MainTex;float4 _MainTex_ST;fixed _HeightFactor;fixed _WidthFactor;v2f vert (appdata v){v2f o;float2 xy = float2(v.vertex.x*(1 - _WidthFactor), v.vertex.y*(1 - _HeightFactor));float4 vertex = float4(xy,v.vertex.z,v.vertex.w);o.vertex = mul(UNITY_MATRIX_MVP, vertex);o.uv = TRANSFORM_TEX(v.uv, _MainTex);UNITY_TRANSFER_FOG(o,o.vertex);return o;}fixed4 frag (v2f i) : SV_Target{fixed4 col = tex2D(_MainTex, i.uv);return col;}ENDCG}}
}

重点就是三行代码

float2 xy = float2(v.vertex.x*(1 - _WidthFactor), v.vertex.y*(1 - _HeightFactor));
float4 vertex = float4(xy,v.vertex.z,v.vertex.w);
o.vertex = mul(UNITY_MATRIX_MVP, vertex);

下面是C#控制脚本：

using UnityEngine;
using System.Collections;public class Heart : MonoBehaviour {[SerializeField]public AnimationCurve width;[SerializeField]public AnimationCurve height;private UIWidget mUIwg;private Material mMat;// Use this for initializationvoid Start () {mUIwg = gameObject.GetComponent<UIWidget>();}// Update is called once per framevoid Update () {float time = Time.time % 1.0f;SetShaderArg(width.Evaluate(time),height.Evaluate(time));}bool SetShaderArg(float w,float h){if (mUIwg){if (mUIwg.drawCall==null)return false;mMat = mUIwg.drawCall.dynamicMaterial;mMat.SetFloat("_WidthFactor",w);mMat.SetFloat("_HeightFactor", h);return true;}return false;}
}

两条曲线的设置：