Bouncing Smiley Face

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

Description

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 ;)

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
Bouncing Ball Physics

• MATLAB release: MATLAB 7.4 (R2007a)

[John D'Errico]

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
   iii=image(imrotate(uint8(flipud(am)),ll,'bilinear','crop'),'xdata',[ccc2-r/2,ccc2+r/2],'ydata',[ccc-r/2
         ccc+r/2]);

??? Error while evaluating uicontrol Callback

[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.

[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.

[Husam Aldahiyat]

Wow, too easy. Thanks.

[John D'Errico]

The appropriate review would just be this.

8-)

[NOUR]

 

[David]

Great program.

[Amelia]

Yes, great program Husam!