3D animation of imported data

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Peter Fraser
Peter Fraser 2016-6-15
评论： Peter Fraser 2016-6-16
I'm trying to animate a 16 x 16 pressure map. The pressure data are imported as num_frames * 16 by 16 array. I reshape it to a 16 by 16 by num_frames array, and use "surf" to display it. I have two problems. I want to be able to rotate the view in real time, but I can't work out how to do that. The animation runs OK without messing with the azimuth and elevation, but when I add the azimuth and elevation I get "too many output arguments" with the "[az, el] = view" line.
P = permute(reshape(out', 16, 16,[]),[2,1,3]);
clearvars out
dims = size(P)
num_frames = dims(3)
[az, el] = deal(-30, 30) % initial view direction
for frame = 1:num_frames
surf(P(:, :, frame))
view = [az, el]
axis([1 16 1 16 0 max(max(max(P)))])
[az, el] = view %update view direction
pause(0.05)
end
The other problem is that I need the "pause" command for it to animate(without the [az, el] stuff. Is it just running too fast without the pause? How to I correctly synchronize the rendering to the monitor display rate?
Thanks
  1 个评论
Peter Fraser
Peter Fraser 2016-6-16
Fixed it.
[az, el] = deal(-30, 30) % initial view direction
for frame = 1:num_frames
surf(P(:, :, frame));
view([az, el]);
axis([1 16 1 16 0 max(max(max(P)))]);
pause(0.03)
[az, el] = view %update view direction
end
There were two problems. My syntax for setting the view azimuth and elevation was wrong. Also, I need to get the az and el after the pause. If I execute
[az, el] = view
before the pause it returns the old value most of the time.
I still need to understand the synchronization issues. Why do I need a pause to get the animation to run in the first place, and how long do I need to wait before the [az, el] = view command? Is there some sort of "wait for frame to be displayed" command?

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回答（1 个）

Nut
Nut 2016-6-16
Hi,
I'm not able to answer your question, I'm writing just for a suggestion. I never used the "drawnow" function, but I know that it is often used when an animation is needed. So, I think it may be helpful for you, try to read about it:
http://it.mathworks.com/help/matlab/ref/drawnow.html
  1 个评论
Peter Fraser
Peter Fraser 2016-6-16
Thanks. That looks interesting and appropriate. I'll check it out.

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