Unity Shader实现黑幕过场效果

本文为大家分享了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

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