On 17/03/2025 03:27, Paul Bourke wrote:
> Looks good. What was the magic sauce? 3.7 or 3.8?
> I'd be much happier if I could use 3.7.
> 
> The look I currently have is with 3.8, sample frame attached. Final render will
> be 12816x2048, and a omni directional stereo pair. Should look good in a 360 LED
> stereo cylinder.
> 
> This one has many more points, 1500K.
> I vary theradius depending on distance from the camera, with some bounds.
> Added light falloff and other stuff.
> 

Thank you for appreciating my work. The alchemy recipe is following:
https://github.com/LeForgeron/povray
built from sources under Ubuntu 24.04.

I prefer this fork, because it supports stereoscopic and many other
useful camera types. In my works it' important, as I am using stereo
VR180 and VR360 projections in XR mode.Please find more info about
Le Forgeron's cameras here:
https://wiki.povray.org/content/User:Le_Forgeron/cameras

If you will choose this way and have 
difficulties while compiling sources, I can assist you.

Here are previous and new versions of static images rendered at
resolution 12816x2048 for comparison:
https://povlab.yesbird.online/pb/lidar_static.html
https://povlab.yesbird.online/pb/lidar_static_v2.html

I noticed that all "ghost magic" disappeared for unknown reasons, please
feel free to send me new code for experiments, as this project is very
close to my interests - data visualization in XR.

Also video have some improvements: start/stop button and additional set
of frames (587 total now):
https://povlab.yesbird.online/pb/

Unfortunately, I am limited in hardware resources, having only
Intel(R) Xeon(R) E-2236 CPU @ 3.40GHz 12 Cores
and
Oculus Go VR headset,
so rendering of 1200 stereo frames at 12816x2048 resolution will take a
lot of time - frame of the first version was rendered ~4 min,
the last ~20 min.

Now I am working on a VR stereo version, and hope tomorrow I will
publish it.

PS: Can't find the attachment you mentioned - don't you forget
to add in ?
--
YB

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> > So now I'm thinking that if there was a way to use a collection of actual
> > snowflake shapes and have them appear, fall a sort way, then fade out - in a
> > cycle centered on their locations, that might make a cool "animated animation".

And here's a short proof of concept.

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Attachments:
Download 'snowingmarket.mp4.dat' (1897 KB)

> I prefer this fork, because it supports stereoscopic and many other

> VR180 and VR360 projections in XR mode.Please find more info about
> Le Forgeron's cameras here:
> https://wiki.povray.org/content/User:Le_Forgeron/cameras

Including a ODSP camera!

I've just implemented one using a vertex shader approach, that is transform
points to a longitude/latitude/distance and do final render with an ortho
camera. Works fine but I would love a ODSP with a cylindrical camera within
PovRay itself.

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On 18/03/2025 07:25, Paul Bourke wrote:
> I've just implemented one using a vertex shader approach, that is transform
> points to a longitude/latitude/distance and do final render with an ortho
> camera. Works fine but I would love a ODSP with a cylindrical camera within
> PovRay itself.
> 
> 
Vertex shader approach ? It's interesting - I would like to look at
(through) it.

I see you already have good set of cameras, that possibly can be
extended: https://paulbourke.net/stereographics/povcameras/

When I was looking for cameras to produce VR images I also
found these sources:
http://stereopov.ichthyostega.de/
http://www.triplespark.net/render/stereo/create.html
--
YB

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On 17/03/2025 03:27, Paul Bourke wrote:
> The look I currently have is with 3.8, sample frame attached. Final render will
> be 12816x2048, and a omni directional stereo pair. Should look good in a 360 LED
> stereo cylinder.
>
Not having a 360 LED stereo cylinders at home, I modeled them in VR:

https://povlab.yesbird.online/pb/lidar_video.html
https://povlab.yesbird.online/pb/lidar_static.html

Camera located inside two cylinders with the same location, but 
different textures - one for left, order for right eye. Now it's only a 
mono preview (both have the same texture, while I am looking for the 
best way to render stereo pairs).
--
YB

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Dr. Bourke,

Let me just briefly segue from your project to say:

It is great to see you here, still using POV-Ray after all these many long
years.

We would love to see you, and many others with your creativity and skill set,
here on our forum more often, and would like to attract others so that we can
sustain and improve this beloved piece of open source software.

I'm not sure what level of exposure to POV-Ray your colleagues get, but it would
be wonderful if undergrads and graduate students, as well as physicists,
mathematicians, statisticians, astronomers, artists, and engineers could be
introduced to what it is currently capable of.
Hopefully by doing so, we can get computer scientists and their students
interested and perhaps attract new interest in further developing POV-Ray.

I was very excited to see a somewhat recent video by Dr. Oliver Knill:
https://people.math.harvard.edu/~knill/various/povray/index.html

Perhaps you can put in a kind word to your colleagues and professional
acquaintances about what we strive to do here in our little corner of the
internet, and help keep POV-Ray - not just alive - but thriving and growing.

Thank you,

Bill Walker

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