I just wanted to share some of the work that I've done with OpenSCAD, so that you may enjoy. It's engineering eye candy, with some music added. Very short clips, about one minute each. Safe for work. Lots of shell scripts to make this stuff.

https://odysee.com/@Neri_Engineering/4wd-road-diff-assy-v2

https://odysee.com/@Neri_Engineering/three-gear-web

https://odysee.com/@Neri_Engineering/2wd-narrow-diff-cutaway

https://odysee.com/@Neri_Engineering/4wd-overview

Very cool.

Did you create the animation with OpenSCAD, or just the parts?

Because there is a lot of interest I will describe the work flow.

Both the parts and the final animation frames are generated in OpenSCAD.

E.g.

openscad --imgsize=$RAW_IMAGE_WIDTH,$RAW_IMAGE_HEIGHT \

--preview \

--projection="perspective" \

--colorscheme="DeepOcean" \

--camera=$TRX,$TRY,$TRZ,$ROTX,$ROTY,$ROTZ,$DIST \

-D't='$T \

-D'rev_factor='$REV_FACTOR \

-D'mode="animation"' \

-o "${GENERATED_IMAGE}" \

"${SCAD_INPUT_FILE}"

inside of a 'while' loop.

I generate the images 2x in size (both width and height) and then use GIMP/TinyScheme to shrink the images, for purposes of antialiasing.

Lastly FFMPEG creates the video:

ffmpeg -r "${VID_FPS}" \

-start_number 0 \

-i "${PNG_OUTPUT_BASE}%05d.png" \

-pix_fmt yuvj420p \

-codec:v libx264 -preset veryslow -crf 8 \

"${OUTPUT_VIDEO}"

There are a lot of fine details that have gone into this. All of the camera work is done in the shell script. Using 'awk' and the like.

18.01.2022, 13:50, "jon" <jon@jonbondy.com>:

Wonderful videos and animations! I, too, would like to understand your
work flow!

On 1/18/2022 1:15 PM, Nerius Landys wrote:

I just wanted to share some of the work that I've done with OpenSCAD,
so that you may enjoy. It's engineering eye candy, with some music
added. Very short clips, about one minute each. Safe for work. Lots
of shell scripts to make this stuff.
https://odysee.com/@Neri_Engineering/4wd-road-diff-assy-v2
https://odysee.com/@Neri_Engineering/three-gear-web
https://odysee.com/@Neri_Engineering/2wd-narrow-diff-cutaway
https://odysee.com/@Neri_Engineering/4wd-overview

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I am designing drive trains for radio-controlled electric cars mostly. 1/10th scale off-road, 1/10th scale on-road "touring", 1/12th scale on-road "Le Mans Prototype", of the 2WD and 4WD varieties. These sorts of cars have historically used what is known as a "ball diff", an idea that was introduced to the R/C car industry by a man named Cecil Schumacher. Ball diffs seems to work well, even though in recent years there has been a push towards bevel-geared diffs and the like. This push away from ball diffs may have something to do with engineers not understanding exactly how to optimize these sorts of differentials. There is a lot of "copy and paste" of designs going on in the industry, I've noticed.

18.01.2022, 19:44, "David Gustavson" <dbg@scizzl.com>:

I’m curious about your application for these. Some clues make me think they are for model cars, not full size ones?

--

David Gustavson

dbg@scizzl.com

On Tue, Jan 18, 2022, at 1:32 PM, Nerius Landys wrote:

Because there is a lot of interest I will describe the work flow.

Both the parts and the final animation frames are generated in OpenSCAD.

E.g.

openscad --imgsize=$RAW_IMAGE_WIDTH,$RAW_IMAGE_HEIGHT \

--preview \

--projection="perspective" \

--colorscheme="DeepOcean" \

--camera=$TRX,$TRY,$TRZ,$ROTX,$ROTY,$ROTZ,$DIST \

-D't='$T \

-D'rev_factor='$REV_FACTOR \

-D'mode="animation"' \

-o "${GENERATED_IMAGE}" \

"${SCAD_INPUT_FILE}"

inside of a 'while' loop.

I generate the images 2x in size (both width and height) and then use GIMP/TinyScheme to shrink the images, for purposes of antialiasing.

Lastly FFMPEG creates the video:

ffmpeg -r "${VID_FPS}" \

-start_number 0 \

-i "${PNG_OUTPUT_BASE}%05d.png" \

-pix_fmt yuvj420p \

-codec:v libx264 -preset veryslow -crf 8 \

"${OUTPUT_VIDEO}"

There are a lot of fine details that have gone into this. All of the camera work is done in the shell script. Using 'awk' and the like.

18.01.2022, 13:50, "jon" <jon@jonbondy.com>:

Wonderful videos and animations! I, too, would like to understand your

work flow!

On 1/18/2022 1:15 PM, Nerius Landys wrote:

I just wanted to share some of the work that I've done with OpenSCAD,

so that you may enjoy. It's engineering eye candy, with some music

added. Very short clips, about one minute each. Safe for work. Lots

of shell scripts to make this stuff.

https://odysee.com/@Neri_Engineering/4wd-road-diff-assy-v2

https://odysee.com/@Neri_Engineering/three-gear-web

https://odysee.com/@Neri_Engineering/2wd-narrow-diff-cutaway

https://odysee.com/@Neri_Engineering/4wd-overview

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