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Bouncing Smiley Face

5.0 | 4 ratings Rate this file 15 Downloads (last 30 days) File Size: 4.65 KB File ID: #23081 Version: 1.2
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Bouncing Smiley Face



23 Feb 2009 (Updated )

Exaggerated and somewhat cartoonish simulation of the physics of a bouncing smiley face.

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The laws for rotation are probably wrong (I made them up actually), but that's not what this file is about. Shown here is a very simple code that creates a nice animation, which can be quickly edited to suit anyone's needs.

The parameters are ball radius, gravity, initial velocity in the Y direction, initial velocity in the X direction, vertical speed conservation (%), horizontal speed conservation (%) and initial angular velocity.

Please note that the ball may stop moving at different locations for different trials, even with the same input parameters. This is due to the slight randomization of the deformations of the ball and the ground, which could lead to the ball getting "stuck" to the ground at times and stopping there. This is normal and deliberate.

Set the vertical speed conservation as a value larger than 100 (e.g. 130) for a small bonus ;)


Bouncing Ball Physics inspired this file.

MATLAB release MATLAB 7.4 (R2007a)
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Comments and Ratings (8)
07 Feb 2010 Amelia

Amelia (view profile)

Yes, great program Husam!

29 Apr 2009 David

David (view profile)

Great program.

24 Mar 2009 NOUR

NOUR (view profile)

25 Feb 2009 John D'Errico

John D'Errico (view profile)

The appropriate review would just be this.


25 Feb 2009 Husam Aldahiyat

Wow, too easy. Thanks.

Comment only
24 Feb 2009 Kenneth Eaton

One solution to the dependence on the Image Processing Toolbox... you could plot a square surface object, then texture map the smiley-face image onto it. Then you can simply rotate the surface object yourself, without a need for the IPT.

Comment only
24 Feb 2009 Husam Aldahiyat

Ah, sorry about that. Will send an update that brings notice to this. Also, you're to be mentioned as inspiration in the code. Forgot to include that in before.

As for getting around the problem, I don't think there's a simple way to do it, so anyone without the Image Processing Toolbox should comment out lines 278 and 282. The result is missing out on the smiley face bit altogether.

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24 Feb 2009 John D'Errico

John D'Errico (view profile)

Looks very nice. I was disappointed that no mention was made of the requirements for use. NO image processing toolbox, no go.

??? Undefined function or method 'imrotate' for input arguments of type 'uint8'.

Error in ==> bb2>go at 282

??? Error while evaluating uicontrol Callback

Comment only
23 Feb 2009 1.1

Fixed eccentricity error, horizontal conservation error.

25 Feb 2009 1.2

Code now works on systems without the Image Processing Toolbox.

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