Peter,

You are more than welcome to embed the video on the OpenSCAD website if you
want to.

The code is not very pretty in many places and lacking in comments, so I
don't think that posting it as an example is a good idea at present. It is
also dependent on a number of libraries that I have written and that just
adds to the issues.

Cheers,
Trygon

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Here is my first attempt at using the animation feature in OpenSCAD.  Nothing
fancy, just me trying to figure out how to do multiple animations to create
one big animation.

https://youtu.be/PqcUOKnN2P8 https://youtu.be/PqcUOKnN2P8

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A few more tips on using FFmpeg:

1. In some scripting languages (you will soon get bored typing in FFmpeg
   commmand options) % is a special character and has to be included by
   escaping it using a preceeding % so:
   -i frame%05d.png    on the command line becomes:
   -i frame%%05d.png    within a script

2. If you want a particular video resolution, you can set up the OpenSCAD
   window so that it is too large and then crop the images using FFmpeg:
   -vf crop=1280:720

3. The -y option stops FFmpeg asking before overwriting the output file,
   useful while iteratively perfecting a video sequence:

ffmpeg -y -start_number 0 -framerate 25 -i frame%05d.png -vf crop=1280:720
-c:v libx264 -pix_fmt yuv420p segment1.mp4

4. To glue (concatenate) a set of video segments together, first create a
   file with the list of segments, in this example the file is called
   "GlueList.txt":

concatenation file list:

file 'segment1.mp4'
file 'segment2.mp4'
file 'segment3.mp4'

The following command glues the segments specified in "GlueList.txt" into a
video called "MyVideo", video (& audio) is copied without re-encoding:

ffmpeg -f concat -i GlueList.txt -c copy MyVideo.mp4

Cheers,
Trygon

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Not sure how everyone else does animations with multiple sequences but this
is what I came up with.

Step #1. I create sub directories for each step, so if there is 25 steps I
create 25 sub directories (step-01 through step-25).

Step #2. I turn on animation, enter in my values, I used 30 for FPS and 25
for Steps.

Step #3. I click Dump Pictures.  When dump pictures unchecks I move all of
the frames into the appropriate sub directory.

Step #4. I then change the variable step from 2 to 3 and repeat Step #3
until all 25 animations have been dumped.

I then use ffmpeg to combine all the frames into single mp4 files and then
concatenate all 25 mp4 files into one larger mp4.

When this runs part1() is called  and moves the part for the duration of the
animation and then when the animation is completed it draws it into its
final position and then calls the next part module: part2() and the process
is repeated.  When the variable step is at say 3 then modules part1() and
part2() only draw the object in the final position and the step3() module
does it's animation.

I would like to hear feedback on this process, if there is any easier way to
do this I would love to hear but being a newbie to OpenSCAD this is what I
came up with.  As far as I could find there are not run time variables so I
could not figure out a way to have one module to do the animation that would
just accept a bunch of parameters.

Inch = 25.4;
function i2m(inches) = inches * Inch;

step = 2;

part1();

module rectangle() {
import("rectangle.stl");
}

module part1() {
translate([i2m(0), 0, 0])
rotate([0, 0, 0])
rectangle();

part2();

}

module part2() {
if (i2m(1.5-($t4)) > 0 && step==2) {
translate([i2m(3.0-($t4)), 0, 0])
rotate([0, 0, 0])
rectangle();
} else if (step >= 2){
translate([i2m(1.5), 0, 0])
rotate([0, 0, 0])
rectangle();

	part3();
}

}

module part3() {
if (i2m(1.5-($t4)) > 0 && step==3) {
translate([i2m(4.5-($t4)), 0, 0])
rotate([0, 0, 0])
rectangle();
} else if (step >= 3){
translate([i2m(3.0), 0, 0])
rotate([0, 0, 0])
rectangle();

	part4();
}

}

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