使用unity自带shader blurEffect

unity 4.7的版本 自带的shader 特效 说明：http://www.ceeger.com/Components/comp-ImageEffects.html

路径在standard pakage 里。

public class blurEffect : MonoBehaviour {

public Shader blurShader;
public float blurSpread = 0.6f;
public int iterations = 3;
private static Material m_Material;

// Methods
private void DownSample4x(RenderTexture source, RenderTexture dest)
{
float y = 1f;
Vector2[] offsets = new Vector2[] { new Vector2(-y, -y), new Vector2(-y, y), new Vector2(y, y), new Vector2(y, -y) };
Graphics.BlitMultiTap(source, dest, this.material, offsets);
}

public void FourTapCone(RenderTexture source, RenderTexture dest, int iteration)
{
float y = 0.5f + (iteration * this.blurSpread);
Vector2[] offsets = new Vector2[] { new Vector2(-y, -y), new Vector2(-y, y), new Vector2(y, y), new Vector2(y, -y) };
Graphics.BlitMultiTap(source, dest, this.material, offsets);
}

protected void OnDisable()
{
if (m_Material != null)
{
Object.DestroyImmediate(m_Material);
}
}

private void OnRenderImage(RenderTexture source, RenderTexture destination)
{
RenderTexture dest = RenderTexture.GetTemporary(source.width / 4, source.height / 4, 0);
RenderTexture texture2 = RenderTexture.GetTemporary(source.width / 4, source.height / 4, 0);
this.DownSample4x(source, dest);
bool flag = true;
for (int i = 0; i < this.iterations; i++)
{
if (flag)
{
this.FourTapCone(dest, texture2, i);
}
else
{
this.FourTapCone(texture2, dest, i);
}
flag = !flag;
}
if (flag)
{
Graphics.Blit(dest, destination);
}
else
{
Graphics.Blit(texture2, destination);
}
RenderTexture.ReleaseTemporary(dest);
RenderTexture.ReleaseTemporary(texture2);
}

protected void Start()
{
if (!SystemInfo.supportsImageEffects)
{
base.enabled = false;
}
else if ((this.blurShader == null) || !this.material.shader.isSupported)
{
base.enabled = false;
}
}

// Properties
protected Material material
{
get
{
if (m_Material == null)
{
m_Material = new Material(this.blurShader);
m_Material.hideFlags = HideFlags.DontSave;
}
return m_Material;
}
}

}

http://www.cnblogs.com/tekkaman/p/4128004.html 这篇文章是关于 Graphics.BlitMultiTap 的介绍