[Scilab-users] How can I make a movie that shows how the sphere rotates around the z-axis?

[Stéphane Mottelet]

Heinz did you manage the offline install of animaGIF ?

Le 02/07/2021 à 23:03, Heinz Nabielek a écrit :
> Thanks. The rotating graphics works well, but on my Mac with Scilab 6.1,  already the first line "scicv_Init()" bumps...
> What to do?
> Heinz
>
>
>
>> On 02.07.2021, at 10:50, P M <p.muehlmann at gmail.com> wrote:
>>
>> .... the rotation can be realised by changing   "rotation_angles"  in a for loop
>>
>> .. creating the movie...maybe use scicv?
>>
>> in a for loop
>> - set rotation angle
>> - display the graph
>> - save the actual graph as an image
>> - reload the image
>> - add image to frame
>>
>>
>> see code below:
>> Only draw back here:   the avi-file could not be played afterwards..and had only 6kB in size.
>>
>> I guess, this is because ffmpeg is missing on my PC, but I am pretty sure that some scicv expert could solve this issue.
>>
>> BR
>> Philipp
>>
>> scicv_Init();
>>
>>
>>
>> R=23;
>> N=14500;
>>   
>>
>> r=grand(N,1,'unf',0,R);
>> phi=grand(N,1,'unf',0,2*%pi);
>> theta=grand(N,1,'unf',0,%pi);
>> x=r.*cos(phi).*sin(theta);
>> y=r.*sin(phi).*sin(theta);
>> z=r.*cos(theta);
>>
>>
>>
>> f = figure();
>> f.background = 8;
>> scatter3d(x,y,z,msizes=4);
>> a = gca();
>>
>>
>>
>> // create the avi file
>> videoWriter = new_VideoWriter("F:\testAvi.avi", CV_FOURCC('M', 'P', '4', '2'), 25, [400, 400]);
>>
>>
>>
>> for i = 0:360
>>
>>      
>> a.rotation_angles = [60, i];
>>
>>      
>>      
>> // save the graph as image
>>
>>      
>> xs2png(f.figure_id, 'F:\testImg.bmp');
>>
>>      
>>      
>> // read image
>>
>>      
>> img = imread('F:\testImg.png', CV_LOAD_IMAGE_GRAYSCALE);
>>
>>
>>      
>> // add image as frame to avi
>>
>>      
>> VideoWriter_write(videoWriter, img);
>>
>>
>>
>> end
>>
>>
>>
>> // free avi from memory
>> delete_VideoWriter(videoWriter);
>>
>>
>>
>>
>>
>> Am Fr., 2. Juli 2021 um 00:22 Uhr schrieb Heinz Nabielek <heinznabielek at me.com>:
>> Colleagues:
>>
>> the code below generates 14,500 random points in a spherical volume.
>> How can I make a movie that shows how the sphere rotates around the z-axis? And how do I store the animation? animaGIF does not exist on my Scilab 6.1 in my macOS 10.15.7
>>
>> Heinz
>>
>>
>> R=23;
>> N=14500;
>> r=grand(N,1,'unf',0,R);
>> phi=grand(N,1,'unf',0,2*%pi);
>> theta=grand(N,1,'unf',0,%pi);
>> x=r.*cos(phi).*sin(theta);
>> y=r.*sin(phi).*sin(theta);
>> z=r.*cos(theta);
>> scatter3d(x,y,z,msizes=4);
>> gca().rotation_angles = [60, 60];
>>
>>
>> ______________
>> Dr Heinz Nabielek
>> Schüttelstrasse 77A/11
>> A-1020 Wien, Österreich
>> Tel +43 1 276 56 13
>> cell +43 677 616 349 22
>> heinznabielek at me.com
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-- 
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet