Unity Shader PostProcessing - 6 - GaussianBlur 高斯模糊+CommandBuffer使用做一些其他的特效

高斯模糊的算法思路我就不再描述，自行百度。

效果1

CSharp

using UnityEngine;

public class GaussianBlurPP : MonoBehaviour
{
    private static int _BlurSize_hash = Shader.PropertyToID("_BlurSize");

    [Range(0, 4)]
    public int iterations = 3;
    [Range(0.2f, 3.0f)]
    public float blurSpread = .6f;
    [Range(1, 8)]
    public int downSample = 2;

    public Material mat;

    private void OnRenderImage(RenderTexture source, RenderTexture destination)
    {
        if (mat == null)
        {
            Graphics.Blit(source, destination);
            return;
        }

        var rw = Screen.width / downSample;
        var rh = Screen.height / downSample;

        var rt0 = RenderTexture.GetTemporary(rw, rh, 0);
        rt0.filterMode = FilterMode.Bilinear;

        // 先将远source复制到rt0，
        Graphics.Blit(source, rt0);

        for (int i = 0; i