1 using System;
2 using UnityEngine;
3
4 // This class implements simple ghosting type Motion Blur.
5 // If Extra Blur is selected, the scene will allways be a little blurred,
6 // as it is scaled to a smaller resolution.
7 // The effect works by accumulating the previous frames in an accumulation
8 // texture.
9 namespace UnityStandardAssets.ImageEffects
10 {
11 [ExecuteInEditMode]
12 [AddComponentMenu("Image Effects/Blur/Motion Blur (Color Accumulation)")]
13 [RequireComponent(typeof(Camera))]
14 public class MotionBlur : ImageEffectBase
15 {
16 public float blurAmount = 0.8f;
17 public bool extraBlur = false;
18
19 private RenderTexture accumTexture;
20
21 override protected void Start()
22 {
23 if (!SystemInfo.supportsRenderTextures)
24 {
25 enabled = false;
26 return;
27 }
28 base.Start();
29 }
30
31 override protected void OnDisable()
32 {
33 base.OnDisable();
34 DestroyImmediate(accumTexture);
35 }
36
37 // Called by camera to apply image effect
38 void OnRenderImage (RenderTexture source, RenderTexture destination)
39 {
40 // Create the accumulation texture
41 if (accumTexture == null || accumTexture.width != source.width || accumTexture.height != source.height)
42 {
43 DestroyImmediate(accumTexture);
44 accumTexture = new RenderTexture(source.width, source.height, 0);
45 accumTexture.hideFlags = HideFlags.HideAndDontSave;
46 Graphics.Blit( source, accumTexture );
47 }
48
49 // If Extra Blur is selected, downscale the texture to 4x4 smaller resolution.
50 if (extraBlur)
51 {
52 RenderTexture blurbuffer = RenderTexture.GetTemporary(source.width/4, source.height/4, 0);
53 accumTexture.MarkRestoreExpected();
54 Graphics.Blit(accumTexture, blurbuffer);
55 Graphics.Blit(blurbuffer,accumTexture);
56 RenderTexture.ReleaseTemporary(blurbuffer);
57 }
58
59 // Clamp the motion blur variable, so it can never leave permanent trails in the image
60 blurAmount = Mathf.Clamp( blurAmount, 0.0f, 0.92f );
61
62 // Setup the texture and floating point values in the shader
63 material.SetTexture("_MainTex", accumTexture);
64 material.SetFloat("_AccumOrig", 1.0F-blurAmount);
65
66 // We are accumulating motion over frames without clear/discard
67 // by design, so silence any performance warnings from Unity
68 accumTexture.MarkRestoreExpected();
69
70 // Render the image using the motion blur shader
71 Graphics.Blit (source, accumTexture, material);
72 Graphics.Blit (accumTexture, destination);
73 }
74 }
75 }
This class implements simple ghosting type Motion Blur.
If Extra Blur is selected, the scene will allways be a little blurred,
as it is scaled to a smaller resolution.
The effect works by accumulating the previous frames in an accumulation
texture.
Called by camera to apply image effect
Create the accumulation texture
If Extra Blur is selected, downscale the texture to 4x4 smaller resolution.
Clamp the motion blur variable, so it can never leave permanent trails in the image
Setup the texture and floating point values in the shader
We are accumulating motion over frames without cleardiscard
by design, so silence any performance warnings from Unity
Render the image using the motion blur shader
