Hi Trygon,  

I found the function "Animate". Can I change the viewpoint?

Cheers,
Thomas

Am 23.01.2016 um 12:19 schrieb Trygon:

<pre wrap="">Thank you all for your kind words.

Thomas, I used FFmpeg (freeware :) ffmpeg.org) to do all the video
post-processing once I had generated the the image frames using animate in
OpenSCAD. I will give you a much more comprehensive answer when I have a bit
more time - my experience is that FFmpeg is very capable but quite daunting!

Peter, The video comprises a number of separate segments, each generated by
its own OpenSCAD script. These were then turned into video segments and
subsequently glued together using FFmpeg. For most segments the opening
position of the components corresponds to the closing position from the
previous segment so the breaks are not visible.

Cheers,
Trygon



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Thomas Bornhaupt
Bernard-Humblot-Str. 8a
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Tel: +49 (6321) 482260
USt-IdNr: DE185938520

Hi Trygon,

could you please give me the parameter for mencoder or ffmpeg?

best regards
Thomas

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Hi Marius,

I did write a lot of library modules and functions to support the main part
scripts, I sent you a portion of this: CylindricalExtrude() - there is a lot
more...

The most useful new feature would be the ability to access raw vertex &
facet information at an arbitrary point in the CSG tree:

shape1=union(){sphere();cube();};
polyhedron(shape1[0],shape1[1]);

and:

shape2=import("Bar.stl");

also, using a module to create a new operator:

module Foo(){
shape1=children();
polyhedron(shape1[0],shape1[1]);
}

Foo() sphere();

I am sure Doug will comment on the syntax for this! ;-)

Cheers,
Trygon

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Hi Thomas,

Quick animation example.

OpenSCAD script:

rotate([0,0,$t*360]) cube(20,center=true);

1. Check that you have OpenSCAD version 2015.03-2 & have installed FFmpeg
2. You must save the script above, so that OpenSCAD has a directory to dump
   the animation picture frames to.
3. Click: View -> Animate (turn on animation)
4. Enter "Steps" as 100
5. Enter "FPS" as 25, this does not really matter, if your computer is not
   quick enough OpenSCAD will still generate all the animation frames but the
   output will not be in real time
6. Check "Dump Pictures"
7. Wait for "Dump Pictures" to uncheck itself
8. Click: View -> Animate (turn off animation)
9. In the directory you saved the script in (step 2) you should have a set
   of 100 sequential animation frame files: frame00000.png -> frame00099.png
10. assuming you have a command prompt and are in the directory with the
    animation picture files, enter the command:

ffmpeg -start_number 0 -framerate 25 -i frame%05d.png SpinningCube.mp4

11. Once FFmpeg finishes running, you should now have an mp4 video file
    called SpinningCube that is 4 seconds long (100 frames at 25 frames per
    second).

Cheers,
Trygon

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Hi Trygon,  

thank you for the description.

My line for ffmpeg is:

ffmpeg -i frame%%05d.png -pix_fmt yuv420p -r 25 XXXX.mp4

I will check your line.

My next step is to make a connection from real video and and openscad video.

1. convert real film to images (with ffmpeg)
2. generate openscad images
3. connect this images (new program)
4. generate film of images (with ffmpeg)

regards
Thomas

Am 27.01.2016 um 14:42 schrieb Trygon:

<pre wrap="">Hi Thomas,

Quick animation example.

OpenSCAD script:

rotate([0,0,$t*360]) cube(20,center=true);

1) Check that you have OpenSCAD version 2015.03-2 & have installed FFmpeg
2) You must save the script above, so that OpenSCAD has a directory to dump
the animation picture frames to.
3) Click: View -> Animate (turn on animation)
4) Enter "Steps" as 100
5) Enter "FPS" as 25, this does not really matter, if your computer is not
quick enough OpenSCAD will still generate all the animation frames but the
output will not be in real time
6) Check "Dump Pictures"
7) Wait for "Dump Pictures" to uncheck itself
8) Click: View -> Animate (turn off animation)
9) In the directory you saved the script in (step 2) you should have a set
of 100 sequential animation frame files: frame00000.png -> frame00099.png
10) assuming you have a command prompt and are in the directory with the
animation picture files, enter the command:

  ffmpeg -start_number 0 -framerate 25 -i frame%05d.png SpinningCube.mp4

11) Once FFmpeg finishes running, you should now have an mp4 video file
called SpinningCube that is 4 seconds long (100 frames at 25 frames per
second).

Cheers,
Trygon



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<pre class="moz-signature" cols="72">-- 
Thomas Bornhaupt
Bernard-Humblot-Str. 8a
67434 Neustadt
Tel: +49 (6321) 482260
USt-IdNr: DE185938520

Setting the pixel format to yuv420p does ensure better compatibility with
older video players, I specify the libx264 encoder first before requesting a
particular pixel format from it:
-c:v libx264 -pix_fmt yuv420p
I am not sure if this is necessary, but it avoids FFmpeg guessing wrongly.

-r sets the output frame rate
-framerate sets the input frame rate
I was told that it is better to set the input frame rate with images (since
there is no frame rate information, unlike an input video) and the output
will then default to the same (unless you also specify -r !)

Cheers,
Trygon

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FFMPeg is pretty cool, I was able to create a video from several animations
(25) captured from Open SCAD and stitch them altogether to make one video.
Not nearly as bad ass as your video but it worked well for what I was after.

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