Mtg 1/26: Tue-07-Jan-2025

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Transcript

Audio Transcript

  • I have a question, what
  • class starts? Is there going to be a group project in this
  • class? I ask for my
  • mental health.
  • You would like another one No. Or,
  • if there is one I just need to, like, mentally prepare, yeah?
  • Or, like, buy enough Red Bull to like, I'll have to do that.
  • Yeah, well, we'll talk about assignments. So it's one
  • o'clock. Let's begin. I
  • so is everyone in the right place? Computer Science, 405805
  • I
  • so it's our first meeting. We have 26 meetings over the
  • semester.
  • So I think everyone knows me what
  • so I'll give you two choices. You can call me Daryl, or you
  • can call me Dr Hepting.
  • Pardon me. Steve already told me off for calling Daryl.
  • So sometimes zoom transcript, I end up as Doctor, happening,
  • okay, so
  • I remember fondly, CS 405, when I was an undergraduate Student
  • here a year or two ago.
  • So
  • I hope this will be a positive experience for you. We're going,
  • let's see, I would say,
  • we're going to do some new Things. CS,
  • um, and we'll see how it goes.
  • I'm so happy to have a whiteboard after the chalkboard
  • last semester.
  • So 405 and 805 we're doing some advanced graphics, so I thought
  • we would take the question.
  • I will use the Physically Based Rendering theory and
  • implementation textbook, and that comes with software on
  • GitHub. So I invite you to get that set up on your own
  • environment. We'll get it set up in the labs as well. So
  • the book has been awarded an Academy Award,
  • and I once, I once was in the same room as the first Author,
  • two different ends of the spectrum, I guess I
  • CS so I have things set up in your courses.
  • The projector is not on. If you want
  • to see it is actually on. I just have the picture turned off.
  • Okay, so I'm gonna fill in some things here over the next couple
  • days. So announcements, those, that's a read only thing that I
  • will send you information. Then there's course email you can use
  • that to get a hold of me
  • so the syllabus, the
  • it is here. So here we are in our first meeting. So we have 26
  • meetings, including April 10, and then our final exam is on
  • April 17, which happens to be my birthday, that won't be on the
  • exam.
  • So I propose to have office hours Mondays and Wednesdays,
  • one to 230
  • if you, if that doesn't work for you, again, for in touch with me
  • and we work something out. I
  • so I would encourage you to come and see me in office hours,
  • because I'm a nice guy. I
  • me Hello, and also, because I don't, if you're having issues,
  • I don't want you to leave it at the end of the semester When
  • there's nothing that can be done about it. I
  • so I used grade scope, any those of you have experience with
  • that, with me? Any thoughts about that?
  • Yeah, I think it's All right. I
  • Okay, so I have a few links here, Physically Based Rendering
  • from theory to implementation. So there's a hard copy book
  • published in 2023 it's all available online at PBR dash
  • book, so if you are happy navigating a Web page, you don't
  • have to buy the Book.
  • And then there's pbrt.org is
  • includes the resources and the links to the software. And then
  • the last link there, the GitHub link, is the repository for
  • version four of the software that you can put on to Your
  • computers. I have it on my MacBook Air and
  • so for grading quizzes before meetings 10% so I'll make a
  • question or two available. By 6pm that'll open at 6pm the
  • night before class. So tomorrow night, at 6pm there'll be a
  • question or two, and you'll have until the start of class to
  • answer it, and then we'll discuss it in class
  • participation 10% so I'm including the wiki in
  • participation.
  • I feel like the wiki can be a valuable thing. I so I'm
  • persisting with that. You may notice I'm not persisting with
  • responses. I
  • so assignments, I've indicated 30% i Okay,
  • so there are in the textbook, there are some exercises that
  • involve modifying the software.
  • So I don't want to take that off the table if somebody is keen on
  • doing some programming to extend and modify the rent the software
  • I
  • but my feeling is we'll focus on using the software to create
  • Images and get an understanding of advanced rendering techniques
  • involved in creating physically, involved in creating accurate
  • simulations of physically let's try that again. Physically
  • accurate simulations of lighting.
  • So we don't so we end up with images that are hard to tell
  • from real.
  • So I have a midterm exam 15% I
  • so this is a Thursday after the break, So be in class And then
  • final exam. I'm
  • and for you, those of you in 405 there might be an opportunity
  • for a research credit. So we have a participant pool in
  • computer science. So if we have studies that involve we have
  • user tests. So if an opportunity exists, I will advertise it on
  • your courses and you can earn up to two marks, two bonus marks
  • for a research credit for participating in up to Two
  • studies. Is
  • that clear? I
  • i wrote assignments twice. I
  • so can you hear me? Okay in the back? Do this seems like a much
  • cozier room than I remember I
  • So hello,
  • I'll just talk a little About the wiki Again, you
  • so I'm recording our meetings in Otter, and then I will post a
  • transcript that otter generates onto the website so you can
  • take, yeah, audio transcript and correct it, clean it up. I will
  • take pictures of the board so we can include those
  • I I bless you. I'm Sorry.
  • I'm Slow there. I
  • it so, summarize, correct the audio, transcript, reference
  • images of the board. Ask questions include ideas for exam
  • questions include links for concepts discussed and other
  • stuff you
  • so I would say, we have, well, we may have 15 students here, so
  • I'd Say sign up for two spots for the Winky.
  • Okay, I'm
  • I thought I made that into A Lake. I
  • Okay, so that's the software. Now I just have to Give it A
  • file. I
  • Let's try Watercolor. I
  • let's do A simpler One You
  • so this is set up to render
  • so we can see the progress of the rendering and
  • I did this at home. It was making good progress.
  • Oh, We have a plus Sign. Yeah,
  • there we Go. Oh,
  • so it's done about a 10th of the time it needs to render the full
  • image and
  • so what do you think about This first pass?
  • It looks realistic, very
  • noisy. Yeah, the bottom looks noisy, but little hard to shut
  • the light on. Yeah,
  • Minecraft, RTX, when it first came
  • out, when you
  • reactor, probably I
  • That's discoloration,
  • yeah, I the stones here, they're
  • very there's a lot of noise,
  • not looking for it. It could be mistaken. Is like discoloration,
  • like the light refraction,
  • and those rectangular gemstones on the base of the crown, like
  • the ones that have surrounded like buckles, almost those don't
  • look like any real gemstone ever, like they're just every
  • color mixed together like they look like a seed, like A seed,
  • at random. You know what? I mean? I
  • Paul, satisfying voice,
  • this is my new subway service. You think,
  • very small. Shall We look at Another one? Yeah,
  • anyone want to call out one head? Okay? I
  • less detail on it, so it's going
  • quicker, so it's going to take longer. I we get
  • a recognizable image quite quickly. I
  • So what's important here we'll talk about a lot is
  • bi directional insert, different kind of interaction function, So
  • we have bi directional reflect, reflectance function,
  • transmission function,
  • and there are others as well. So does this look like it could be
  • a person?
  • Like It looks like a person from a game, as far as like, all the
  • way real. It's something's off about it little uncanny around
  • maybe the islands.
  • Okay, it is cool, but you can see the light behind this gear,
  • though. Yeah, he looks dead. He's either dead or I'm going to
  • be dead, and that is up to something.
  • That's the uncanny right there. But I feel like everything looks
  • realistic. You look at it individually, yeah, that's true.
  • If you look at it as a whole, though, it just feels slightly
  • off, but that's just, that's just lightning, that's just
  • uncanny.
  • Something around the Bucha is messed up like, if that makes
  • sense, it's obvious,
  • getting more realistic,
  • looking for this stretch
  • marks growing it looks like he's concentrating really hard to
  • blow up My head with
  • his mind. Give him
  • a minute.
  • I not
  • want to be killed by the eldership Divine Being from
  • beyond. Thank
  • you. Thank you.
  • Greg is all powerful. He lets us Live Our Way.
  • We kind of have a
  • project. This is actually, this is chronologically in order,
  • after Greg hope. This is Greg opens his eyes, that is seven
  • seconds, he casts a fireball. That's why he that's why his
  • eyes were closed.
  • I send you the dust. That's what You see in Your Mandal story
  • behind
  • i So will These scenes render the same every time, or do they
  • render different every time? So if you did another head, would
  • it look similar to the previous one? Or would it be very
  • different?
  • It would be very similar. So it's a question of how many
  • samples? So we can use different integrators and different
  • sampling regimes,
  • but it's about the the number of samples. So if we specify a
  • higher degree of precision, then we get we're converging to an
  • image in a very high quality image. The Yeah,
  • what if we had 100,000 image samples, and we were trying to
  • generate an image of an apple, but we had like, 50,000 images
  • of apples and 50,000 images of bananas. And my question is
  • like, how convergent and how divergent is the image be like?
  • Would it but look like if we try to kind of like, generate two
  • polar opposite images, like, if you try to, like, merge samples
  • together,
  • I think that's not a computer graphics problem. That's
  • that's an AI generative AI problem. Maybe that's
  • yeah, let's see how long it's going to take. Well, 4000
  • seconds. So I
  • there's a video online of someone using this bathroom and
  • putting
  • I set myself up for that. So use using the model and then adding
  • a geometric figure, kind of slicing through the figure in an
  • animation.
  • But it's this bathroom, and so the geometric figure was sitting
  • on top of the counter. I
  • does this scene have any post processing in it, or is it just
  • the rendering engine doing all of the lighting effects? Because
  • it's almost like there's blue. But at the same time, I don't
  • know if that's just look it hasn't finished yet. It does
  • look like it's struggling with the ground, and certainly the
  • light of the wall, the like sort of bright, sort of dots that are
  • individualized, instead of sort of like merging together a
  • little bit, unless it's just a dirty ground.
  • Yeah, someone's splashing around there.
  • Yeah, so there's still a lot of noise. It's a
  • pretty big scene.
  • Let's go to the
  • I'm looking for images, but I wanted to point this out, this
  • is from Moana, rendered using pbrt 2018 there are over 146
  • million unique triangles, And with instancing, there's 10s of
  • billions of triangles. I
  • thought that was interesting. Yeah,
  • profile picture just dropped. That's Weird.
  • I know there were some of these sample images in
  • the bottom right you can go into to the Next page. So the next
  • section, I
  • hope to assume
  • I see, yeah, that one doesn't have the weird color on the
  • gemstones, and they stopped. One facing us, yeah. And the pearls
  • are all kind of nice,
  • yeah. And also the
  • weather had a little bit of specs all over ours, but not
  • this one.
  • So So an interesting bit of history here. It was originally
  • rendered with 1280, samples per pixel in 73 hours of computation
  • on a quad core CPU on a modern GPU, pprt renders seen the same
  • sampling rate in 184 seconds. You
  • Let's see how we're doing. I
  • Is that the only one that's running, or all of those don't
  • run.
  • I don't believe the other ones are running. I think I can
  • switch to windows here, though. I
  • whatever You
  • that's look at
  • I'm heard dodecahedron in A bathroom that's
  • This is the bathroom
  • I've think it is. It doesn't have, oh, it doesn't have a tub
  • in it. It's not quite the same. It also
  • has some extra lighting. Yeah, I
  • it's the same wallpaper in the background,
  • though, so yeah,
  • the taps or same place, it's very similar,
  • yeah, if you live a mirror, the background is exactly the same,
  • like the wallpaper, yeah, the painting on the wall, it's just
  • like they have a different point of view. Even the crown molding
  • is the same. I
  • so something you think about for assignments, do we want to
  • generate images or do we Want to do some,
  • some modifications to the code? Modifications?
  • Yeah, so I I
  • don't want to put pressure on anyone to make a decision. Does
  • it seem like this will be An interesting,
  • interesting semesters worth of images? I
  • Any questions or concerns I
  • Okay, so I'll put up the scheduler so somebody can take
  • on today's wiki page. I and
  • then I will post the quiz for tomorrow at six, and then we'll
  • start into it. So have a look at chapter One at the pbrt.org
  • There's a
  • so There's,
  • there's the bathroom, and here's The water in The tub. And
  • so there's lots of things to look at. So I would say you can
  • include links there in the wiki that you're putting together, if
  • you happen.
  • I don't have to say anymore. I think anyway, any other
  • questions or concerns, should
  • we call it a day? Motion to adjourn. Okay, thanks again for
  • today, everyone. Take care and we'll see you on Thursday.

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