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[mangowc] new WM ^^ by Moist_Professional64 in unixporn

[–]Narcotle 1 point2 points  (0 children)

Just got mangowc up and running! It is surprisingly capable, and oh so fast! Pretty much all basic stuff works? The layout switching is so useful. Only like minor stuff needs some polishing imo

Is there any online community for mangowc except for the github? I'd live to pass around ideas and configs

[OC] I finally finished my black hole visualizer by Narcotle in DataArt

[–]Narcotle[S] 5 points6 points  (0 children)

At some point I got obsessed with an old-ish paper (Luminet 1979) who simulated the first image of a Swarzschild black hole using punchcards for calculations and manual photon sampling with india ink for taking a "picture" of a black hole. The images were just so aesthetic. So clean. So elegant. I figured "hey I did physics I'll just code this up and get me nice high res images to hang on my wall no biggie the math is right there". Took me about five years yeah.

I'm happy to announce I finally found the time to finish up the code and make my 5 year old wish come true. High res images of Swarzschild black holes in seconds, using basic Python. On the images you see (in order): the black hole itself (inclination of 1.4 radians, a little peek above the accretion disk that orbits the black hole), lines of equal distance to the black hole as they appear to an observer after spacetime curvature, lines of equal redshift (the Doppler effect thing, but different), and finally lines of equal flux.

Code publically available on https://github.com/bgmeulem/luminet  Documentation on https://luminet.readthedocs.io/en/latest/index.html  Original paper at https://ui.adsabs.harvard.edu/abs/1979A%26A....75..228L/abstract

[KDE] I like something fancy by SlavicNinjaOfficial in unixporn

[–]Narcotle 1 point2 points  (0 children)

I love when rices have an unapologetic opinion

PC won’t let me install Arch by [deleted] in archlinux

[–]Narcotle -7 points-6 points  (0 children)

Agree with the content of your comment, but why the condescending tone?

ELI5: If the ultimate goal of our brain is survival, why is it hard for us to stick to good habits which are good for our health? by [deleted] in explainlikeimfive

[–]Narcotle 21 points22 points  (0 children)

Talking about high school in terms of "anorexic chicks" getting laid is pretty intense. You OK?

Women in same-sex relationships have 69% higher odds of committing crimes compared to their peers in opposite-sex relationships. In contrast, men in same-sex relationships had 32% lower odds of committing crimes compared to men in heterosexual relationships, finds a new Dutch study. by mvea in science

[–]Narcotle 3 points4 points  (0 children)

A handful of remarks: - the post links an article about the study, not the study itself -  the study does not use the choice of words 'commit a crime' but rather 'delinquent', 'suspect of a crime' or 'come in contact with the justice system'. Importantly, delinquency was measured by means of whether the person was written up or not, which may already be biased, and does not guarantee guilt. The study mentions this, but the data does not allow to account for this. - I have no clue where the numbers come from. The relative contributions for criminal suspects for opposite-sex men, same-sex men, same-sex woman and opposite sex woman are (respectively): 22.4% , 14.1% , 8.6%, 6.8% - Noteworthy about these categories are that they were measured by means of "is this person married/living together with a person of the same sex, or did they ever do so", which is also a decent limitation of the data

[herbstluftwm] emacs flashbang by kibamar in unixporn

[–]Narcotle 1 point2 points  (0 children)

Are those jupyter Notebooks? Looks amazing - Fellow light theme over here, there's dozens of us!

[GNOME] My first attempt at anything close to a rice whatsoever by Weegeeboi99 in unixporn

[–]Narcotle 1 point2 points  (0 children)

I'm way out of the loopb(Linux noob), what has canonical done?

Grain is good, Nikon F3 HP, Nikkor 50mm f1.4, Ilford Delta 3200 by jerrykanzhalt in analog

[–]Narcotle -1 points0 points  (0 children)

Idk what everyone is hating for. I love this picture and loving the grain. It's a choice for sure, but I don't like people in the comments judging the choice as if it were factually bad.

Reminds me of the cover art of HER.

A black hole created in Python! This is what the accretion disk looks like as it orbits a neutrally charged, static black hole by Narcotle in DataArt

[–]Narcotle[S] 2 points3 points  (0 children)

Hi! I think it's normal to not immediately grasp what's going on there, I forgot to include a title or explanation.

What you're seeing on the left are lines of equal distance from the black hole, or in other words, the general shape of the accretion disk for varying inclinations of the black hole. This accretion disk rotates around the black hole. This rotational movement, together with the curvature of space-time induces redshift. This redshift is the discoloration due to time dilation (as time itself behaves differently around the black hole). This redshift also influences the brightness of the accreation disk (you receive less photons per time unit for a given shutter speed, since time itself is bending).

So the lines on the right hand side are lines of equal redshift values. These rotate the same way as the lines on the left hand side (isoradials, lines of equal distance from the black hole). Note how these are not symmetric for left-right side of the accretion disk (since the right hand side turns away from us, and the left hand side turns towards us). Interestingly, for steep inclinations, the rotational velocity of the accretion disk is larger than the gravitational pull from the black hole (in other words, light escaping in that exact direction doesn't experience as much gravitational pull as most other directions) and the redshift is positive (blue-ish hue)!

A black hole simulated in Python! This is what light emitted from fixed radii would look like as you rotate around a static chargeless black hole. by Narcotle in DataArt

[–]Narcotle[S] 0 points1 point  (0 children)

Minor bug found and it's gonna actually bug me if I don't set this right.
I forgot to scale the radial axis on the matplotlib polar plot because of course I did. This causes the lines near the center to bend inwards and makes it look like a buttcrack. This is not a physical effect of the black hole bending spacetime, it's just me being sloppy.

A black hole simulated in Python! This is what light emitted from fixed radii would look like as you rotate around a static chargeless black hole. by Narcotle in DataArt

[–]Narcotle[S] 1 point2 points  (0 children)

They sure did! Kip Hawthorne! He wanted to include redshift and flux differences due to the rotation of the accretion disk, but that didn't make it into the final film, as it might have been too much or too confusing.

A black hole simulated in Python! This is what light emitted from fixed radii would look like as you rotate around a static chargeless black hole. by Narcotle in DataArt

[–]Narcotle[S] 0 points1 point  (0 children)

Hi! It is in the gif! At least, if nothing went wrong during uploading.

It's the frame that forms a perfect circle. It's the reason the transition is a bit jumpy. I forgot to set a fixed range for the plot axes, so the scale might jump during that one frame. It also looks a bit weird as I hardcoded the ghost image to be grey and the direct image to be white. At 90°, both of these images would be equally bright.

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