Posts by ajtribick

by ajtribick
20.07.2021, 17:03
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-11-30)
Replies: 73
Views: 17548

Re: Updated stars.dat including Gaia DR2 data (update 2020-11-30)

A small Python utility to extract the data from stars.dat and dump it into a CSV file (actually comma-separated, so be careful if your regional settings make Excel assume semicolons as separators). Should work with Python 3.6+, and only requires the Python standard library. The stars.dat file is ass...
by ajtribick
05.07.2021, 06:54
Forum: Help Central
Topic: Celestial Matters site alive again!
Replies: 21
Views: 3962

Re: Celestial Matters site alive again!

Why do you think there is one? Developer communications aren't a website or a file hosting service.
by ajtribick
04.07.2021, 22:21
Forum: Help Central
Topic: Celestial Matters site alive again!
Replies: 21
Views: 3962

Re: Celestial Matters site alive again!

I know you're disappointed you don't get to play with shiny new toys, but you people seem to desperately want to attribute malice here. I'll just point out that the Celestial Matters forum went offline as a result of the same ibiblio hosting outage that took down the Celestia Motherlode for a few mo...
by ajtribick
04.07.2021, 17:08
Forum: Help Central
Topic: Celestial Matters site alive again!
Replies: 21
Views: 3962

Re: Celestial Matters site alive again!

fsgregs - what is your evidence that Fridger never intended to release celestia.Sci and was lying. My assessment of the state of the code when I was working on it (note I removed my copies of the code when I stopped working on it, so don't bother asking me for it), is that it was not ready for relea...
by ajtribick
26.06.2021, 19:38
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-11-30)
Replies: 73
Views: 17548

Re: Updated stars.dat including Gaia DR2 data (update 2020-11-30)

An alpha build of the EDR3-based stars.dat, using my own cross-matching code for HIP-Gaia and TYC-Gaia, I give no guarantees on correctness. Still a few more features I want to add before I consider it done, and I haven't done too much verification other than checking a few test stars have ended up ...
by ajtribick
09.06.2021, 18:27
Forum: Add-on releases
Topic: Generic exoplanet textures
Replies: 11
Views: 859

Re: Generic exoplanet textures

Nice work, the default textures could definitely use an update! (Saying this as the person who made the current set back in the Pleistocene or whenever...) If you're intending to release these as CC-BY, it would be useful to specify which version of the license you intend to be using (the current on...
by ajtribick
01.05.2021, 07:43
Forum: Add-on releases
Topic: W Ursae Majoris binaries
Replies: 4
Views: 1732

Re: W Ursae Majoris binaries

Did a bit of cleaning up of the scripts, in the process of which I re-downloaded the source data. This resulted in the addition of WZ Cygni to the output files, for a total of 404 systems.

Version 1.0.2 can be downloaded here.
by ajtribick
22.04.2021, 19:11
Forum: Modelling
Topic: Opening CMOD in blender
Replies: 10
Views: 2020

Re: Opening CMOD in blender

however there is a DOT NET 5 ( C# ) microsoft only ( maybe linux with wine but i have not tried it ) , cmod to obj program It should work on any platform where the .NET 5 runtime can be installed, which includes Mac and Linux (at least several of the more popular distros), so hopefully WINE would n...
by ajtribick
22.04.2021, 19:01
Forum: Utilities
Topic: CMOD to OBJ+MTL converter
Replies: 6
Views: 1749

Re: CMOD to OBJ+MTL converter

Made a few minor changes and cleanup (the main difference from the end-user perspective is that the correct version gets displayed if you pass in the --version parameter). New version is v0.1.0-beta3. For those who don't want to compile it themselves, I've added a cross-platform framework-dependent ...
by ajtribick
11.04.2021, 10:18
Forum: Utilities
Topic: CMOD to OBJ+MTL converter
Replies: 6
Views: 1749

Re: CMOD to OBJ+MTL converter

While the CMOD ASCII format is documented, as far as I'm aware this hasn't been done for the binary format. I've included the places in the Celestia code base where the enums are defined. Values are stored in a little-endian format. Tokens are 16-bit integers. The values are defined in modelfile.h, ...
by ajtribick
10.04.2021, 17:09
Forum: Utilities
Topic: CMOD to OBJ+MTL converter
Replies: 6
Views: 1749

CMOD to OBJ+MTL converter

I've put together a CMOD to Wavefront OBJ+MTL converter. It's still very preliminary and probably full of bugs (as distinct from limitations caused by the file formats not supporting identical feature sets) but I managed to load the result of converting the default ISS model into Blender. You will n...
by ajtribick
18.03.2021, 23:10
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 90
Views: 83592

Re: Extrasolar, Stars and Exoplanets for Celestia

Thanks for test-driving the instructions!
by ajtribick
18.03.2021, 21:30
Forum: Add-on releases
Topic: W Ursae Majoris binaries
Replies: 4
Views: 1732

W Ursae Majoris binaries

Recently a paper was posted to the arXiv detailing a database of W Ursae Majoris-type binaries: Latković et al. (2021) . I decided to rewrite* my earlier W UMa binaries add-on to use this database. Version 1.0.1 can be downloaded here . After removing systems for which I could not get sufficient dat...
by ajtribick
09.03.2021, 12:06
Forum: Development
Topic: Merging Cosmonium with Celestia?
Replies: 20
Views: 3470

Re: Merging Cosmonium with Celestia?

This is essentially demanding that one of the projects (which one?) gets killed off. I don't see that's necessary, or that the momentum of a new project like Cosmonium should be sapped by tying it into a "legacy" project like Celestia: if Cosmonium has more momentum and development activit...
by ajtribick
03.12.2020, 22:12
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-11-30)
Replies: 73
Views: 17548

Re: Updated stars.dat including Gaia DR2 data (update 2020-11-30)

A quick update with regards to the now-released Gaia EDR3. The process I'm using to generate stars.dat relies on several sources external to the Gaia release itself, including: ⋅ The geometric distance catalogue, that estimates the distances with an exponentially-decaying distance prior ba...
by ajtribick
30.11.2020, 19:33
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-11-30)
Replies: 73
Views: 17548

Re: Updated stars.dat including Gaia DR2 data (update 2020-11-30)

I've released a new version v1.0.4 which uses relative parallax error to choose between Gaia DR2 and XHIP parallaxes (this affects the cases of Alpha Cas and Delta Sgr mentioned by DrJMOS, they should be back at more reasonable distances). This affects 1787 stars out of a total 2499574. There's also...
by ajtribick
29.11.2020, 13:22
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-11-30)
Replies: 73
Views: 17548

Re: Updated stars.dat including Gaia DR2 data (update 2020-11-30)

mean 1.3737 kpc is true? I see you didn't check what was inside the spoiler tag... :) Gaia cannot measure the brightest stars, and of the ones it can measure the bright ones tend to have fairly unreliable parallaxes. Since at the moment I only take the XHIP distances if there is no Gaia parallax, s...
by ajtribick
29.11.2020, 13:00
Forum: Ideas & News
Topic: Celestia.Sci news - what's going on?
Replies: 31
Views: 5367

Re: Celestia.Sci news - what's going on?

Quite frankly, if you've decided you don't think it's a dead project that isn't going to end up being released, you are perfectly free to just leave it and move on. The fact that several members of this community continually need to attack and disparage them every time celestia.Sci gets mentioned is...
by ajtribick
28.11.2020, 13:49
Forum: Ideas & News
Topic: Celestia.Sci news - what's going on?
Replies: 31
Views: 5367

Re: Celestia.Sci news - what's going on?

A project taking longer than expected does not make it bogus or fraudulent. A project that turns out not to work in the end does not make it bogus or fraudulent. The people involved have lives outside celestia.Sci, progress can be slow or grind to a halt for long periods of time. Talking of economic...
by ajtribick
28.11.2020, 12:42
Forum: Ideas & News
Topic: Celestia.Sci news - what's going on?
Replies: 31
Views: 5367

Re: Celestia.Sci news - what's going on?

If I decide to make changes to Celestia's source code, I am not morally obligated to send you every individual keystroke I make. The celestia.Sci developers consider their changes to be in a work-in-progress state, it is their decision on what stage they decide to release them, and in what forum. No...

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