Unity Shader实现黑幕过场效果

本文实例为大家分享了Unity Shader实现黑幕过场效果的具体代码，供大家参考，具体内容如下

一、效果演示

二、实现

Shader：黑幕过场着色器

//黑幕过场着色器

Shader "Custom/BlackScreenSpread"
{
Properties
{
 _Color("Main Color", Color) = (1,1,1,1)
 _MainTex("Base (RGB)", 2D) = "white" {}
 _Radius("Radius",float)=1.5
 _Center_X("Center_X", float) =0.5
 _Center_Y("Center_Y", float) =0.5
 _Sharp("Sharp", float) = 100
}

SubShader
{
 Pass
 {
  ZTest Always Cull Off ZWrite Off
  Fog{ Mode off
 }

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

fixed4 _Color;
 sampler2D _MainTex;
 float _Radius;
 float _Center_X;
 float _Center_Y;
 float _Sharp;

float _tanh(float x)
 {
  return 2.0f / (1.0f + exp(-2.0f * x)) - 1.0f;
 }

float4 frag(v2f_img i) : COLOR
 {  
  _Center_X=_Center_X*(_ScreenParams.x / _ScreenParams.y);
  float x = i.uv.x*(_ScreenParams.x / _ScreenParams.y);
  float y = i.uv.y;

float dis = sqrt((x - _Center_X)*(x - _Center_X) + (y - _Center_Y)*(y - _Center_Y));
  float t = _Radius - dis;
  float rt = 0.5f + _tanh(t * _Sharp) * 0.5f;
  float col = float4(rt, rt, rt, rt);
  return tex2D(_MainTex, i.uv) * col * _Color;
 }
 ENDCG
}
}
Fallback off
}

CS：后处理的基类

using UnityEngine;

/// <summary>
/// 后处理的基类
/// </summary>
[ExecuteInEditMode]
[RequireComponent(typeof(Camera))]
public class PostEffectBase : MonoBehaviour
{
   [Header("后处理着色器")]
   public Shader shader = null;

private Material _material = null;

public Material material
   {
       get
       {
           if (_material == null)
           {
               _material = GenerateMaterial(shader);
           }
           return _material;
       }
   }

protected Material GenerateMaterial(Shader shader)
   {
       if (shader == null || shader.isSupported == false)
       {
           return null;
       }
       Material material = new Material(shader);
       material.hideFlags = HideFlags.DontSave;
       if (material)
       {
           return material;
       }
       return null;
   }
}

CS：黑幕过场效果(挂载到渲染的相机上)

using UnityEngine;

/// <summary>
/// 黑幕过场效果
/// </summary>
[RequireComponent(typeof(Camera))]
public class BlackScreenSpread : PostEffectBase
{
   [Header("黑幕半径")]
   [Space(25)]
   public float radius;

[Header("黑幕中心")]
   public Vector2 center;

[Header("使用边缘模糊")]
   public bool useEdgeBlur;
   [Header("边缘模糊值")]
   public float blur = 10;

public void OnRenderImage(RenderTexture source, RenderTexture destination)
   {
       if (material)
       {
           material.SetFloat("_Center_X", center.x);
           material.SetFloat("_Center_Y", center.y);
           material.SetFloat("_Radius", radius);
           material.SetFloat("_Sharp", useEdgeBlur ? blur : 200);
           Graphics.Blit(source, destination, material);
       }
       else
       {
           Graphics.Blit(source, destination);
       }
   }
}

——设置属性

来源：https://liuhaowen.blog.csdn.net/article/details/109529957