How can I do a frame-capture style video recording in "Simulink 3D Animation" using matlab?

2014 4 9
3 个回答
更新时间：2026 2 19
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I'm trying to create video recording of a complicated (30+ nodes) system in "Simulink 3D Animation" that is driven by a matlab script (I don't have simulink). The system is complex enough that I can't simply use the video recording functionality that records what is displayed in the animation viewer because it is too slow and choppy.
Instead, I would prefer to approach the problem similarly to animations in standard matlab plots, in which I use "gcf" to capture the frame, and then when I use "movie2avi" I can dictate the frame rate, such that no matter how long my simulation takes to run each loop, I get an output video with the correct fps.
Alternatively, I'm open to any solution that allows a deterministic selection of frame rate that is not dependent on how fast the computer is able to churn through the model.

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回答（3 个）

Jan Houska
Jan Houska 2014-4-10

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To get a single static screenshot of the current Simulink 3D Animation figure, please do
y = capture(vrgcf);
Then, you should be able to create the video stream by using selected screenshots, as needed.

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Nathan Fenner
Nathan Fenner 2014-4-11
Thanks for the help.
I ended up using vr.canvas, and then using getframe(gcf) and that worked pretty well.
I can't get capture(vrgcf) to work.
From a high-level I'm using it as follows:
for i=1:endIndex
%update virtual scene
M(i) = capture(vrgcf);
end
movie2avi(M, 'test');
When I do this, I get the error: "Subscripted assignment dimension mismatch."
I'm having trouble finding the documentation for proper use of this function (and basically all documentation associated with "Simulink 3D Animation").

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Jan
Jan 2014-4-15

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Hi Nathan,
The error message "Subscripted assignment dimension mismatch." comes from the different matrix sizes during the assignment - with (i) subscript the M matrix doesn't get expanded to the assumed size (x,y,i)..
Instead of arranging the matrix M I suggest you to use the VideoWriter object, where you can easily add frames by code like this:
writeVideo(rec_obj, capture(vrgcf))
Best Regards,
Jan
Angelo Yeo
Angelo Yeo 2026-2-19，4:51

0 个投票

MATLAB/Simulink from R2025a supports recording Simulink's 3D Animation with sim3d.io.VideoWriter (MATLAB) or Simulation 3D Video Writer block (Simulink).

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Angelo Yeo
Angelo Yeo
2026-2-19，4:51

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