POV-Ray : Newsgroups : povray.advanced-users : Facebook 3D posts : Re: Facebook 3D posts Server Time
28 Nov 2021 15:34:57 EST (-0500)
  Re: Facebook 3D posts  
From: Francois LE COAT
Date: 4 Nov 2021 05:30:53
Message: <6183a84d$1@news.povray.org>

>>>> Bald Eagle writes:
>>>>> Take for example Francois LE COAT's very interesting work:
>>>>> http://news.povray.org/povray.advanced-users/thread/%3Cweb.5bb77cec
>>>>> Forgive me if there's a lot of things I don't understand, properly 
recall, or
>>>>> have wrong, but it seems to me that an aerial photograph of a lands
cape has a
>>>>> lot of perspective distortion, and part of the photogrammetry proce
ss would be
>>>>> correcting for that.
>>>> For the time being, I'm experimenting to model trajectories in 3D.
>>>> But it is a difficult work, because public images given by the NASA
>>>> are not of good quality. If the Ingenuity helicopter flying on Mars 
>>>> driven with my trajectory modelling, it would have crashed. But it i
>>>> what I'm measuring, with input data I could collect. This is strange
>>>> I have no other possibility than to improve my computations further 
>>> For the 9th flight over Mars, I collected better images from the
>>> surface. To understand what I'm computing, here is another work
>>> from mine...
>>> (1) <https://twitter.com/Astro_Aure/status/1414699163569246210>
>>> You can see a cursor pointing at Ingenuity's localization, moving on
>>> the map, following the helicopter's motion. What I would like to do, 
>>> to compute this in space, with "translate <Tx, Ty, Tz>" in 3 dimensio
>>> (2) <https://www.youtube.com/watch?v=MT5SqhJ0Jio>
>>> I could also "rotate <Rx, Ry, Rz>" and "shear <Sx, Sy, 0>" but it is 
>>> working for the moment. And I rendered this with Persistence Of Visio
>>> The algorithm I'm using is probably close to what is used on Mars,
>>> because it is constructed to avoid the drift from the embedded IMU.
>>> It's not viewed from the top (like (1)) but from the surface of Mars.

>> For 10th flight over Mars, Ingenuity followed an elaborate trajectory.

>> NASA planned to take color pictures of remarkable points on ground.
> I've been concerned by 11th flight over planet Mars yesterday August
> 14th, after Ingenuity helicopter happened August 4th...

> RAW separated images were released by the NASA at the location:
> <https://mars.nasa.gov/mars2020/multimedia/raw-images/?af=HELI_NAV,HE

> <https://twitter.com/RevesdEspace/status/1426147951693402114>
> August 13th. I worked on this video. It takes a delay between the
> day of the flight, and final result here. But this video comes
> from a very distant location in space!


This is interesting because the cadence is higher with 7 images/s. So
reconstructed 3D localization of the helicopter is now more precise...


Ingenuity flew Oct. 24th and the mission is not yet fully accomplished!

Best regards,



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