Captures a video of the 3D plot in the current axis as it rotates based on ViewZ and saves it as 'FileName.mpg'. Option can be specified.
ViewZ: N-rows with 2 columns, each row are the view angles in degrees, First column is azimuth (pan), Second is elevation (tilt) values outside of 0-360 wrap without error,
*If a duration is specified, angles are used as nodes and views are equally spaced between them (other interpolation could be implemented, if someone feels so ambitious).
*If only an initial and final view is given, and no duration, then the default is 100 frames.
FileName: Name of the file of the produced animation. Because I wrote the program, I get to pick my default of mpg-4, and the file extension .mpg will be appended, even if the filename includes another file extension. File is saved in the working directory.
(OptionZ): Optional input to specify parameters. The ones I use are given below. Feel free to add your own. Any or all fields can be used
OptionZ.FrameRate: Specify the frame rate of the final video (e.g. 30;)
OptionZ.Duration: Specify the length of video in seconds (overrides spacing of view angles) (e.g. 3.5;)
OptionZ.Periodic: Logical to indicate if the video should be periodic. Using this removed the final view so that when the video repeats the initial and final view are not the same. Avoids having to find the interval between view angles. (e.g. true;)
% % % Example (shown in published results, video attached) % % % %
MPEG-4 video option only available on Windows machines. See fix where the VideoWriter is called.
Getframe is used to capture image and current figure must be on monitor 1 if multiple displays are used. Does not work if no display is used.
Active windows that overlay the figure are captured in the movie. Set up the current figure prior to calling the function. If you don't specify properties, such as tick marks and aspect ratios, they will likely change with the rotation for an undesirable effect.
Cheers, Dr. Alan Jennings
It's awesome function.
Thank you Dr. Alan Jennings for the awesome code.
Adding transparency (alpha(0.3)) is not working for me. Is there a tunraround? See example below. Even though it seems that the necessary frames are captured, the final movie file only shows a still image. Thanks.
%% Set up 3D plot to record
%% Set up recording parameters (optional), and record
Also (apologies for bombarding with comments/questions) is there a way to make the background white? I've used:
but it doesn't seem to be working and returns to grey in the video?
This is such a clear code and has helped so much - thank you. Just wondered if you had any tips - I'm making a rotating video of a 3D mesh for a presentation and would like it to keep looping through. When I use the 'loop' feature in powerpoint there's always a short pause before it restarts - any idea how to avoid that issue?
Very clear written code. Thanks
Great code. Thanks.
This code worked perfectly on first use. Well documented. Thank you!
Thanks for adding the quote from the help file. I've seen getframe 'glitch' in some cases, but never had the opportunity (or motivation) to really track down how they crop up and are resolved on different platforms.
Apparently, I can't do multiple comments on the same day...
Hi Thai, Glad it helps!
You could add another field for OptionZ for specifying the frame size. I don't think there's a great way of doing this in general. The way I normally do it, is to size the figure and then crop the matrix from getframe:
A_temp = getframe(gcf);
A_temp = A_temp(OptionZ.fWidth(1):OptionZ.fWidth(end),OptionZ.fHeight(1):OptionZ.fHeight(end))
I don't have MATLAB here, so there's a good chance there's some typos here. I often get the width and height mixed up.
Hi, as per the help on getframe. "Setting the figure Renderer property to zbuffer or painters works around limitations of using getframe with the OpenGL renderer on some Windows® systems." Doing this solved the "static image" problem found by Christian Jensen below.
Can we specify the frame size from the scripts?
Great job! Great script and great videos!
Thank you, Alan. I thought that might be the case. Post-processing using After Effects video stabilization might offer a good solution without a major re-write, which is what I will try now. Mayavi in Python is also pretty smooth and offers a nice alternative.
The short answer is, you don't make it better. Sorry.
MATLAB 3d plots and patches have always had some issues. I thought if I'd try hard enough, I could fix them, but it's just not the tool for that, just like you wouldn't want to make animations in PowerPoint.
The two main issues I've seen are the aspect ratio and limit jumping around for 3d plots (what I think you are referring to), and order/overlap being in the wrong order.
You can manual set the axes limit, axes pixel limits and aspect ratio every frame, but it's a whole lot of work to make it looks better, and sometimes perfect is impossible. The other issue is that based on the 3d location, some meshes should be hid by other meshes, but instead they are shown on top. I don't think the order you plot them affects this, but it's been a while and I don't remember. My suggestion is to change the renderer.
Hope this helps, Alan
Thank you for the excellent script! I'm getting very smooth video with point plots, but the mesh plots have a lot of jiggling to them, which ends up looking like camera vibration. How can I fix this?
Thanks for your reply! that helped me for sure! Changing the rating to 5.
Glad it helped Lazaros!
To make it bigger, just make the figure window bigger.
If you’re having issues with the compressions with the ‘MPEG’ format, you can add a quality factor, but the default of 75 (of 100) normally works good for me.
Add the following lines to the function, CaptureFigVid.m
And then from where you call it, add
Can you specify the size of the video to upgrade the quality and make it better looking?
Can you help me transform this function
for i = 1:length(x)
for j = 1:length(y)
if (a*abs(x(i))) <= abs(y(j))
z(i,j) = abs(y(j))
if (( abs(x(i)) <= abs(y(j)) ) && ( abs(y(j)) <= a*abs(x(i))))
z(i,j) = a*abs(x(i));
if (b*abs(y(j))) <= abs(x(i))
z(i,j) = abs(x(i))
if (( abs(y(j)) <= abs(x(i)) ) && ( abs(x(i)) <= b*abs(y(j))))
z(i,j) = b*abs(y(j))
title ('Plot Title', 'FontWeight','Bold','FontSize',11) % Add labels...
xlabel ('X Axis Label', 'FontWeight','Bold','FontSize',11)
ylabel ('Y Axis Label', 'FontWeight','Bold','FontSize',11)
zlabel ('Z Axis Label', 'FontWeight','Bold','FontSize',11)
grid on ; % Switch on the figure grid, and
set(gca,'GridLineStyle','-') % set the grid to solid li
I do not understand how can I rotate my graph drawing function.
Thank you !!! :)
If I don't include (...,'FaceLighting','phong')
in my surf plot, the figure spins but the movie is just one static image. Why is that?
Thanks! A couple of bugs/ideas:
1. You should make it an option to fix the "zoom pumping", maybe it is the camera position, that rotation the plot under a larger elevation (say 45°) does not cause the plot to zoom in and out in every quadrant while rotating. Try this to see what I mean:
Just as an example, this file solves this quite nicely
2. spacing the view angles makes sense, but I don't get why I can only specify two view angle pairs. In line 89 you limit this. Why not make it dependent on OptionZ.Periodic?
3. OptionZ.Periodic=true still causes a non-smooth jump when looping the video. Don't know why this is exactly
4. Add export for an animated gif instead of mp4. How to write one can be seen here:
Download apps, toolboxes, and other File Exchange content using Add-On Explorer in MATLAB.