Viewing profile — aplavin

> I do wonder if you do like, size estimates of a black hole in my room. Suppose I have a black hole in my room, I'd be curious to know what the mass of that is, like a fun fact, t…

Would MSAA compute more samples, effectively multiplying shader computation? Ideally, it should be something adaptive, to the number of pixels/device compute power, eg compute 2x s…

> I thought "oooh this is interesting I wonder how they are going to do physically accurate on an end device" Recalling how the original particle sim was something like 100TB, took…

Hmmm I think I see what's happening here. Basically, all devices I tested (laptops/phones/tablets) seem to have small pixel size, and to save on compute power for weaker devices I …

The vast majority of scientific images, be it in papers on press releases, are using an arbitrarily-chosen colormap to map whatever numeric values are there to actual visible pixel…

To describe cow's gravity? Pretty much so. Then, for visualization and even for many biological purposes, it's accurate enough to mode the cow as a bunch of organs with known proce…

>> I follow the by-far-dominant approach in scientific literature, where color mapping choice is completely unrelated to physical accuracy of the plotted observations or simulation…

> why the stars surrounding the black hole are just points, and more over why the lines are straight to the centre of the hole Sorry for confusion! Points + lines are just other us…

That would be fun indeed! Not sure I would literally want to put this into my room though.

You mean, without a camera and a screen, out of pure physical objects? You can actually reproduce gravitational light bending quite accurately with a properly-shaped lens (some win…

Could you please share a screenshot so that I investigate what actually happens? I tested on a few different devices, but far from anything extensive.

Hmm, interesting! I saw that it's a draft, and didn't investigate further. Maybe it does work indeed on some browsers. Generally, the compatibility story turned out more fragmented…

> not using a perceptually uniform colormap in the year 2026 is quite a blunder Then you are up for a big surprise if you browse through modern published papers :)

> What exactly is physically accurate here though? I'll assume this is a good faith question, hope it was intended like one. I view strong light bending as the key distinguishing p…

Note that most of the points you raised are clearly not bugs – most notably, things like non-rotating black hole or colormap choice. At the very most, these can be considered missi…

Arguing about colormap choice seems very strange to be – this is such a common practice in astronomy (and other fields!). The vast majority of images you see in published papers ap…

That option for rotating (Kerr) black holes generally works, but not on all devices in my experiences. Debugging on someone's phone is not that straightword, so I went with the mos…

> AR + camera warping don't work together, unfortunately – browser API limitations. So, you either choose AR and see the simulated emission from around the black hole, properly war…

Yes, even observing a single jet pointed towards us (typically, at just a few degrees) is routinely used a strong argument for existence of many similar powerful sources, just misa…

It's purely my color map choice – the underlying simulated image is simply a number at each pixel. Transforming that number to the actual displayed color is generally an arbitrary …

Sure, see https://blackhole.plav.in/ar_example.mp4 for an example. Should work on most Android phones, even old ones (mine is 7 years), the Chrome browser is generally best for AR.…

Sure, most of the raised questions are reasonable potential feature additions to be made – things like rotating black holes, or linear brightness-to-screen-pixel mapping. They just…

Eagerly awaiting WebGravity API support to control your device's builtin gravity field generator!

Yes, as said in the text, unfortunately this is a limitation of browser APIs. You either get AR and no access to the camera feed (this is the AR mode here, black hole floating in y…

Colormap/colorscale is generally considered an arbitrary choice in scientific plots or visualizations. Linear mapping of simulated emission brightness -> screen brightness could be…