Unity shader实现自由放大缩小效果

本文实例为大家分享了Unity shader实现自由放大缩小效果的具体代码，供大家参考，具体内容如下

代码：

以下实现的shader代码：

Shader "Hidden/Wave"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_WaveWidth("Wave Width",float) = 0.5
_CenterX("CenterX",float)=0.5
_CenterY("CenterY",float)=0.5
}
SubShader
{
// No culling or depth
Cull Off ZWrite Off ZTest Always

Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag

#include "UnityCG.cginc"

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

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

float _WaveWidth;
float _CenterX;
float _CenterY;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
}

sampler2D _MainTex;

fixed4 frag (v2f i) : SV_Target
{
float2 center=float2(_CenterX,_CenterY);
float2 distance= center - i.uv;
float x=center.x+ center.x*(-distance.x/center.x) *(1-_WaveWidth);
float y=center.y+ center.y*(-distance.y/center.y) *(1-_WaveWidth);
float2 uv = float2(x,y);
return tex2D(_MainTex, uv);
}
ENDCG
}
}
}

主要的内容还是在frag中。

下面是挂在摄像机上的脚本：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class WaveCreame : MonoBehaviour {

public Shader waveShader = null;
[Range(0.0f,1f)]
public float waveWidth = 0.3f;
private Material m_WaveMaterial = null;
private float m_CenterX = 0.5f;
private float m_CtenterY = 0.5f;
// Use this for initialization
void Start () {
m_WaveMaterial = new Material(waveShader);
}

// Update is called once per frame
void Update () {
Vector3 pos = Input.mousePosition;
m_CenterX = pos.x / Screen.width;
m_CtenterY = pos.y / Screen.height;
if (Input.GetMouseButton(0)) {
waveWidth += Time.deltaTime * 0.5f;
}
if (Input.GetMouseButton(1))
{
waveWidth -= Time.deltaTime * 0.5f;
}
}

private void OnRenderImage(RenderTexture source, RenderTexture destination)
{
if (waveShader == null || m_WaveMaterial == null) return;
m_WaveMaterial.SetFloat("_WaveWidth", waveWidth);
m_WaveMaterial.SetFloat("_CenterX", m_CenterX);
m_WaveMaterial.SetFloat("_CenterY", m_CtenterY);
Graphics.Blit(source, destination, m_WaveMaterial);
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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