Joe
983 posts
Joe
@Copper_irl
CSULB Physics and Applied Mathematics student, class of 2024(?) Tried for a CS degree for a decade, pivoted to physics. I really like computer rendering
Los Angeles, CA Katılım Eylül 2009
2.1K Takip Edilen217 Takipçiler
This one was fun! Didn't take too long either. Definitely not hours and pages of work. It's the negative of the laplace transform of cosine, evaluated from a to b. Feynman integration strikes again
Mathieu@miniapeur
Redondo Beach, CA 🇺🇸 English
youtu.be/Y6bWUfmJ0-4
My solution isn’t a clean formula, it’s code, so I’m a bit apprehensive to share it. I swear I’ve solved it before too, the same way, to render exact per pixel umbras back in high school. Should I prepare it nicely or just share what I have?
YouTube
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Watched a YouTube math video that setup this cool proof that involved finding the area where a square and a circle intersect, and the presenter said it’s unsolved. I uh… solved this for my physics report a bit ago, but it’s computationally hairy. Should I comment on the video?
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I love when latex generates comfy text, but my god I really need to learn how it works under the hood. I can't quite figure out how to get the alignment to do what I want.
This is part of an assignment for a class i got an incomplete in. I'll be posting fun graphics for it soon!
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Somehow, of all the things Ive tried (antidepressants included), L-Theanine (a chemical in tea but not coffee), and Creatine (a workout supplement) are the most impactful in terms of energy reserves. I can finally start working again but i can’t shake the feeling theyre placebos.
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@lisyarus Since this is a cpu rasterizer, heres a fun experiment if you can get shaders working again: Are shader quads ideal? I know this is how gpu hardware works, but I'm curious if there's any performance advantages to using differently sized pixel groups like 2x1, 3x3, 16x9, etc.
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Switched the rasterizer loop to working on 2x2 pixel quads to compute texcoord derivatives, and selecting a mipmap level (color-coded on the video) based on the projected texel area. This looks a bit too conservative, I guess GPU's actually use smth different here?
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I think in my attempts of explaining things as thoroughly as possible I actually made them way more obscure 😅
Time to rewrite this section from scratch I guess
Nikita Lisitsa@lisyarus
I'm in the process of writing the quaternions article and oh boi I'm spending so much time explaining something instead of just saying "4-dimensional real associative algebra" in the hopes of making the article be much more accessible 😭
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@AlexanderRKlotz @PolymerPolymath Njit is a bit picky but it is comparable to c in performance when it works. I’ve used cppyy before as an alternative but it’s way pickier. I think the right decorators help njit compile properly but I usually have to write c-like code for it to be happy
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@PolymerPolymath I pasted my code into their example notebook and it gave me weird errors, so that's enough for me.
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My MATLAB code computes the 2nd Vassiliev invariant for a 100-vertex trefoil knot in 0.026 seconds. My Python code does it in 2.89 seconds, 108x slower. Time to learn C?
Alex Klotz@AlexanderRKlotz
I have started giving python a serious use after spending my entire career using MATLAB and would like to report that I am, in fact, a dingus.
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@BenSimsTech Oops, it’s gohugo.io. That’s what I get for manually typing it instead of copy pasting
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@BenSimsTech No personal experience, but some devs I know use hugo.io because it lets them use markdown easily. There’s a ton of options here to generate static sites apparently. Hugo’s latex integration looks easy, so it’s my first pick when I get around to making one
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Does anyone use github pages for a blog and have a simple workflow? The documentation is convoluted and doesn't make a lot of sense and I don't want to mess around with jekyll or anything unnecessary/complex, I just want to add text, code, formulas and images to make blog posts.
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@sp_monte_carlo Whoops! Been using that one as a variant of capital I for so long I completely forgot its capital phi. Full time job as Flux manager makes it very different to the angle triplets
Redondo Beach, CA 🇺🇸 English
For fun I did a radius inversion (r → 1/r) to watch the behavior as the ray diverges. It appears that the sdf implicitly includes the point at infinity, so maybe PGA is better for sdfs in general? I've really gotta get @EricLengyel's book on this, it looks fantastic
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Matplotlib's lack of a zbuffer for 3d plots is a bit of a pain. The black grid should weave between the data shown here, but since its rendered last, it renders on top. I should be able to hack together an sdf solution in time, but I really ought to write my own renderer soon.
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@BenSimsTech How do you feel about immediately aliasing these variables? For example with a derivative of smoothstep:
res = 6*timerElapsed()*(1 - timerElapsed())
imo the shorthand is easier to read in this case but i can def see where your coming from
t = timerElapsed();
res = 6*t*(1 - t);
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