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"Include video clips of rotating graphs"

Asked by Phillip on 12 Dec 2012

To be honest this question is school related, but its not for a Matlab course. Its for Fluid Dynamics, so I won't get in trouble for asking this question.

I am using scatter3 to plot data points that I obtained from experiment. To complete the assignment I must "Include video clips of rotating graphs."

I have no idea how to do this.

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Phillip

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1 Answer

Answer by Walter Roberson on 12 Dec 2012

See the documentation for VideoWriter : it has an example.

2 Comments

Phillip on 12 Dec 2012

I tried to modify to code to work with a scatter3 plot, but I get an error that the frame size must be 435 x 343.

Here is the code that gave the error:

writerObj = VideoWriter('peaks.avi'); open(writerObj);

Z = peaks(3); scatter3(Z(:,1),Z(:,2),Z(:,3));

axis tight

set(gca,'nextplot','replacechildren');

set(gcf,'Renderer','zbuffer');

for k = 1:20

   camorbit(18,0)
   frame = getframe;
   writeVideo(writerObj,frame);

end

close(writerObj);

Walter Roberson on 12 Dec 2012

You would get that response if the frame that you grab is not always the same size. You can specify the frame location and size when you getframe()

Also note that it is sometimes necessary in practice to add a pause(0.2) before the getframe() call, that sometimes even drawnow() is not good enough.

Walter Roberson

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