SHMotionBlurSprite class will function just like a normal sprite, but it will give the children a motion blur effect. You can change the blur duration in seconds with “blurDuration” and change the starting blur alpha with “blurAlpha”.

• Project: Quads With Blur
• Screenshot: QuadsWithBlurScreenshot.png
• Recording: QuadsWithBlurRecording.mov

//initialize a motion blur sprite with the default properties
SHMotionBlurSprite *motionBlurSprite = [SHMotionBlurSprite motionBlurSprite];
 
//set the blur duration to 10 seconds
motionBlurSprite.blurDuration = 10.0f;
 
//set the starting blur opacity to 25%
motionBlurSprite.blurAlpha = 0.25;
 
//set the blur duration to a negative number to set motion blur to forever
motionBlurSprite.blurDuration = SH_MOTION_BLUR_INFINITE;
motionBlurSprite.blurDuration = -1.0f;
 
//set the blur duration to zero to turn the motion blur off
motionBlurSprite.blurDuration = SH_MOTION_BLUR_NONE;
motionBlurSprite.blurDuration = 0;

1. Download the source files here: https://gist.github.com/gists/870334/download
2. Open your desired Sparrow project
3. Drag and drop the files into the “Groups & Files” pane
4. Open “Game.h”
5. Include the extension:

   #include "SHMotionBlurSprite.h"

6. Save “Game.h”

1. Download the source files here: https://gist.github.com/gists/870334/download
2. Save the files into Sparrow's “/Classes/” directory
   • Example: “/sparrow/src/Classes/”
3. Navigate back one directory and open “Sparrow.xcodeproj”
   • Example: “/sparrow/src/Sparrow.xcodeproj”
4. Inside the “Groups & Files” pane, locate the “Display” group folder
   • Example: “Sparrow → Classes → Display”
5. Right click the “Display” group folder and click “Add → Existing Files..”
6. Navigate into the “/Classes/” directory and select “SHMotionBlurSprite.h” and “SHMotionBlurSprite.m”, then click “add”
7. On the next window, leave all options as default and click “add”
8. In the “Groups & Files” pane, Open “Sparrow.h”
   • Example “Sparrow → Classes → Sparrow.h”
9. At the bottom of the file, add:

   #import "SHMotionBlurSprite.h"

10. Save “Sparrow.h”
11. Close “Sparrow.xcodeproj”

• 2011-01-14: First version
• 2011-01-15: Optimization and bug fixes
• 2011-03-27: fixed small warning, added property “renderTexture” so objects can be drawn to it directly if needed

• change default width/height to screen width/height based on rotation
• Allow objects to render behind it
  • Change the clear alpha value to 0
  • Get the motion blur to show correctly while alpha value equals 0

• Daniel for the idea of how to implement a motion blur effect