【Unity Image Effect】Vignetting 光晕效果

Vignetting 光晕效果 ：可以实现场景中的聚焦，以及对中心之外的物体做模糊处理

是什么

上图是王者荣耀的游戏截图，王者荣耀在战斗结束的时候都会做背景模糊处理，场景模糊的效果很赞。

怎么做

Unity的 Image Effect插件

有很多自带的各种效果处理。因此我们先来看看有没有合适的。导入Unity的 Image Effect插件包，在Camera组件下面添加脚本 Vignette and Chromatic Aberration ，先看一下具体效果。

该脚本有三个参数

Vignetting：数值越大，可视范围越小，外围通过黑色填充

Blurred Corners：数值越大，中心之外的物体向中间模糊。最小值：不模糊；最大值：整体模糊

BlurDistance：模糊的程度，数值越大越模糊。

Chromatic Aberration：画面拉伸的偏移。数值越大，偏移的越厉害。

修改一下Aberration的枚举为Advanced

可以调节画面更加细微的东西。具体不再演示。

实现

using System;
using UnityEngine;namespace UnityStandardAssets.ImageEffects
{[ExecuteInEditMode][RequireComponent (typeof(Camera))][AddComponentMenu ("Image Effects/Camera/Vignette and Chromatic Aberration")]public class VignetteAndChromaticAberration : PostEffectsBase{public enum AberrationMode{Simple = 0,Advanced = 1,}public AberrationMode mode = AberrationMode.Simple;public float intensity = 0.036f;                    // intensity == 0 disables pre pass (optimization)public float chromaticAberration = 0.2f;public float axialAberration = 0.5f;public float blur = 0.0f;                           // blur == 0 disables blur pass (optimization)public float blurSpread = 0.75f;public float luminanceDependency = 0.25f;public float blurDistance = 2.5f;public Shader vignetteShader;public Shader separableBlurShader;public Shader chromAberrationShader;private Material m_VignetteMaterial;private Material m_SeparableBlurMaterial;private Material m_ChromAberrationMaterial;public override bool CheckResources (){CheckSupport (false);m_VignetteMaterial = CheckShaderAndCreateMaterial (vignetteShader, m_VignetteMaterial);m_SeparableBlurMaterial = CheckShaderAndCreateMaterial (separableBlurShader, m_SeparableBlurMaterial);m_ChromAberrationMaterial = CheckShaderAndCreateMaterial (chromAberrationShader, m_ChromAberrationMaterial);if (!isSupported)ReportAutoDisable ();return isSupported;}void OnRenderImage (RenderTexture source, RenderTexture destination){if ( CheckResources () == false){Graphics.Blit (source, destination);return;}int rtW = source.width;int rtH = source.height;bool  doPrepass = (Mathf.Abs(blur)>0.0f || Mathf.Abs(intensity)>0.0f);float widthOverHeight = (1.0f * rtW) / (1.0f * rtH);const float oneOverBaseSize = 1.0f / 512.0f;RenderTexture color = null;RenderTexture color2A = null;if (doPrepass){color = RenderTexture.GetTemporary (rtW, rtH, 0, source.format);// Blur cornersif (Mathf.Abs (blur)>0.0f){color2A = RenderTexture.GetTemporary (rtW / 2, rtH / 2, 0, source.format);Graphics.Blit (source, color2A, m_ChromAberrationMaterial, 0);for(int i = 0; i < 2; i++){	// maybe make iteration count tweakablem_SeparableBlurMaterial.SetVector ("offsets",new Vector4 (0.0f, blurSpread * oneOverBaseSize, 0.0f, 0.0f));RenderTexture color2B = RenderTexture.GetTemporary (rtW / 2, rtH / 2, 0, source.format);Graphics.Blit (color2A, color2B, m_SeparableBlurMaterial);RenderTexture.ReleaseTemporary (color2A);m_SeparableBlurMaterial.SetVector ("offsets",new Vector4 (blurSpread * oneOverBaseSize / widthOverHeight, 0.0f, 0.0f, 0.0f));color2A = RenderTexture.GetTemporary (rtW / 2, rtH / 2, 0, source.format);Graphics.Blit (color2B, color2A, m_SeparableBlurMaterial);RenderTexture.ReleaseTemporary (color2B);}}m_VignetteMaterial.SetFloat("_Intensity", (1.0f / (1.0f - intensity) - 1.0f));		// intensity for vignettem_VignetteMaterial.SetFloat("_Blur", (1.0f / (1.0f - blur)) - 1.0f);					// blur intensitym_VignetteMaterial.SetTexture ("_VignetteTex", color2A);	// blurred textureGraphics.Blit (source, color, m_VignetteMaterial, 0);			// prepass blit: darken & blur corners}m_ChromAberrationMaterial.SetFloat ("_ChromaticAberration", chromaticAberration);m_ChromAberrationMaterial.SetFloat ("_AxialAberration", axialAberration);m_ChromAberrationMaterial.SetVector ("_BlurDistance", new Vector2 (-blurDistance, blurDistance));m_ChromAberrationMaterial.SetFloat ("_Luminance", 1.0f/Mathf.Max(Mathf.Epsilon, luminanceDependency));if (doPrepass) color.wrapMode = TextureWrapMode.Clamp;else source.wrapMode = TextureWrapMode.Clamp;Graphics.Blit (doPrepass ? color : source, destination, m_ChromAberrationMaterial, mode == AberrationMode.Advanced ? 2 : 1);RenderTexture.ReleaseTemporary (color);RenderTexture.ReleaseTemporary (color2A);}}
}

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