Mtg 11/26: Tue-11-Feb-2025

Outline for Today

Cameras and Film

Administration

Today

Assignment due dates
Ideas for exam questions that will give a fair assessment of your learning to date (to the end of Chapter 5)
Chapter 5, sections 1 and 2

For Next Meeting

Take quiz before the start of our next meeting

Wiki

Link to the UR Courses wiki page for this meeting

Media

Transcript

Audio Transcript

Doing very good. How do you do a good end? I pretty
good.
How you doing good? All right, sorry, I wasn't keeping an eye
on the clock.
Been there. We've all been there working on something. The next
thing you know, it's one o'clock in the
morning. Done that so many times less so now Alex 10 has moved
Back in I don't do that nearly as often.
I so here we are at meeting 11. I
Yeah,
meeting 11, February 11.
Yes,
sorry. I'm used by small things. I
so we're in the last week before the breaks. We have a meeting on
Thursday, then the break. And then we meet on Tuesday, the
25th and that day we can do some review for the midterm, if you
like. And we'll start on Chapter Six then, so We'll deal with
chapter five, today and Thursday. You
here's our meeting for today. See came
up? Okay?
So? Assignment due dates I was checking with both Our marker I
first assignment, six marks That's due February 25 Tuesday
At
2359 and
59, I What do you think about that?
So the final two assignments and would be due at the same time.
Yeah,
hello, I was now in time does midterms of
27 Correct? Yes.
So it should be in the calendar. Let's check it out. Do
Is it may be filtered. I
Mom, our nature. I thought I
had taken out the attendance for that Day, but don't stress about
attendance for that day. I
winter, February, 27
in class. So there's no quiz that class, then obviously,
yeah, I You did remove that
my brain is actually, I
you can ask you, what do you need to bring today? And you're
going to respond with pencil, pencil sharpener, maybe an
eraser, and you remember your student card. And
yes, yeah, I think Dr Hepting Well enough by now.
Yes, I'm
just trying to get
into that. I've been around for forever. It's my third Dr
Hepting class. I day class.
284, 28, don't you know who my professor is? I
I know I have to do another wiki, so
I will get that done off the Break.
It's on my list of things to do. I
do so Mr. D,
like one right before this one,
I brought that all right again. I I
did. Oh, is this four questions? Wow, is this any questions about
what I'm asking for assignment? One,
okay, change in size, adding
one spheres. Changing the size so
you will be able to click on a description very soon. I just
wanted to get the dates and the marks into your courses for you
to
appreciate it, so now we can transfer them to our own
calendars.
Yeah, So has anyone done the export calendars from your
courses?
I have another planning app I
use. No I just meant to have the
transfer all The due dates to your own calendar And
Okay so?
So I want to encourage you to do that. I
If you don't make any suggestions, I guess we'll still
have a midterm. Anyway, though,
when did you walk them by? I
How about the day? Monday, the 24th and midnight. I 359,
on the 24th or 2359 on the 23rd
24 24 Okay, Yes.
Thank you for that.
So
These are randomly generated, as you realize, perhaps not
randomly generated, but randomly ordered. So we talk in the book,
he talks about different spaces and
in which we can work and render. So what is an advantage of or
what is the camera world space, and what is advantage of
rendering in it?
Well, it's basically like relative to the camera. It's the
biggest part of it, really
the Carroll road space. The origin of this space is the
camera's position, but it maintains the orientation of the
world space. It is not necessarily looking down to Z
axis.
And then that's
render space tied to that's the render space tied to the Canada
world spaces. But there's a half that's not lot of
my I'm just gonna look up David's
point. So rendering space can be the world space, the camera
space or the camera world space.
So that's just
an umbrella term for
space we're rendering in
feeling it should be at the top, and the other ones, if it is an
umbrella term, it should be, it should be first and then the
other one should be the only.
According to that coordinating system, it's just the place
where it's being rendered. That's a rendering space. But
that's all it is. It's not
they seem like they're separate.
The rendering space is just your choice of those three coordinate
systems. Which one you want to render
it. So rendering space is mentioned above the list, but
it's at the end of
it. Should I feel like it should just be the first of the four of
them that are listed?
Yeah, that's a good point. I think it's not like
they're even trying to go in alphabetical order, because they
have object space at the top object
world, yeah, so are some of these familiar, yes,
very familiar camera space, because whenever you're doing
like, like game development, or anything like that. You're from
the camera's point of view all the time, and then you can
always leave it to do, like, to move stuff around in the world,
to place things. So in a similar way, you have them as separate
sort of entities. Just because you move your character doesn't
mean the entire world moves around. The camera just moves.
Yeah, I camera
to me, camera space versus camera world, space. Camera
spaces, if you're looking at it like first person and then
Camera, camera world is where you're looking at the whole
scene altogether, like where you're a third like you're
outside. Like the classic Mario game would be a camera world,
space where the first person shooter of me, one I don't know
what Call of Duty would be, camera space like that's what
we'd be looking
at. Makes sense,
yeah, but I think we have to be careful. I
we have to be careful in the sense that the final product we
see on the screen as you're playing a game, for example,
it's the final product. Is the output. So, camera, world camera
space, world space, these are
the details under the hood, so to speak, and there are some
efficiencies that can be gained from them. Does
that make sense?
So what's an advantage of using camera world space as a
rendering as The rendering space,
more precision and geometric details preserved you.
More precision is definitely the case here, because if we have an
astronomical translation and
rare. So here's the original car. Here's a translation of a
million units I think
looks like a Lego car, maybe a
so what happens here is, because we've we've used up the
precision translating a million units away, so We don't have
very much to work with anymore, and so we get this imprecise
image. So that's a reason why. Maybe not rendering in world
space is a good idea, and this is a camera world space.
The viewpoint has shifted
slightly, same here things
just the pixels are slightly offset because they're giant
blocks instead of, you know, no, I think compared to the
original,
that's what the description said. Viewpoints shifted
slightly due to a lot of accuracy and the representation
of
the camera. Think you might have to zoom into the micro pixels to
find that very end of this
CS, the translated CS, rendered camera road space. Much more
precision is available than geometric details preserved.
However, the viewpoint is shifted slightly due to loss of
accuracy in the representation of the camera position.
In other words, they couldn't get the exact camera position.
Let's test that
doesn't appear different
display on them, probably the difference
in artifacts for J bagging I
safe image as What's going on here. I
Okay, Let's take a
it's an interactive image. I guess that's feature, Not the
bug. I
Okay. Now
let's try and reset it. Does
that look like it's Yeah, I think
that is Okay. I
I don't feel like it should not say anything at all if it's
working, but
it doesn't look like New files Be Great. I
You put the second one quotation works, the camera, World card,
The other ones you put in quotes, yeah, that
one because there Were arguments to the switches on the command
line. I
Ah, I think we're getting closer. Yeah,
so I was able to generate an error message so it's it's
working. It should say there's no difference. Who agrees with
me on that? No but I'm just saying the Image tool software
should report that there's no difference between two images. I
uh,
my technique would have been to Photoshop put them images right
on top of each other, and use a difference filter to see if
there's any differences. But then, since they're like, What
JPEGs, P and GS, there's still going to be micro differences
just because the file format. So I don't know if there's a good
way to do it, without the artifacting and stuff like that,
but here anyway,
So not conclusive, but it seems like they're the same image.
It'd be really awkward if they just put the wrong image up,
like they actually put the same image twice. It's like they
didn't even notice the difference is not aligned. Yeah,
it would be really awkward. I
as we Have that in this PPR, Four scenes, I believe i
Not sure which one it is. Let's try to smoke this Car. I
i don't i did this before, So I think it's Maybe the VMW. I
I only had 35,000
seconds. Yeah, we won't hold our breath for that one.
I Okay, let's change
it. A little better. A
little better. Yeah, he didn't want to wait for him for 34,000
seconds. I
No, that's Not it. I it.
Maybe it is the pm or the sports car then,
yeah, See what else we have here. I Have Here You
Daryl, Yeah, I
Okay, so We can that's
let's take a look At the pbrt file. I Guess I
I'm wondering where how To specify render Space. I
so it's An options, Okay?
Okay, back to The quiz we
took. Took screenshots, screenshots. I
so what's the implication of the shutter that opens for a short
period of time? Motion
Blur? Why do they want to emulate motion blur in the first
place? What's the benefit of having motion blur?
We can remove some of the at least for cinematic qualities.
Some people like an emotional blur, because it emulates older
film, because the film was literally moving as you the
camera. So like, as light went across, a new blur going
through, like, like, if you took two images and smeared it to
them to give a cinematic effect. And it can also kind of review,
reduce motion sickness if you're staring at something really the
high refresh rate, but if you're a gamer itself, yeah, okay,
cancel
motion. Yeah. I get that. We can do it, but like, it's a still
image. So I was wondering why we, why we want to emulate
motion blur? Like,
let's assuming it's not a still image, because if there's, if
nothing's moving, there's no motion blur.
Yeah, could be like thinking, like you could render an image
of a sprinter, but I'm wondering why you'd want to make him
blurry. Show the boy running, you know?
So we get the sense of
then being a sprinter, sprinting, moving blur, faster
than a speeding bullet
also be used for like films that use Physically Based Rendering,
so as they have moving
between each other, okay, that makes one sense. I
I think I was messing
around with
Adobe Illustrator, and there was a film. I took a little video on
the job, set it so watching it,
I increased budget settings, added extra frames interval
in between them and watching them just like a sudden jerk
around and move to fill it with the gaps of So very ai,
COVID, I
I see if I am correct about wall E, B,
that's Not the bold title. Think it's just Wally.
No, not that
different. Wally. Oh, do we?
Any future
Restaurant Andre?
Will We be at? Andre? Do?
Featuring the first use of motion blur in CGI Animation.
Should we have A peek at it? Oh,
hole. Here you go, these Wings. I
These women you
so yeah, for wings, we need that
pretty impressive. Yes, that was 19, Eight, six. I
So the last question is about a circle of confusion.
This was a little confusing for me to wrap my head around a
little
bit. It's basically like when you have an actual camera, if
you ever, like, if you don't have, like, the infinite focus,
or like a parallel lens, you could focus at a point which is
the focal length, and anything that is for or after that goes
into the prism, and it either scatters at the imaging medium
so the sensor of the film, or it reverses up or reverses down, so
it scatters at some point Before the Vocal Point of the lens,
creating Boca or depth of field so things become blurrier the
farther out or the closer to the camera. Thank
You. So it's so
a point does not lie on the plane of focus as image to a
disc on the film plane, rather than to a single point. The
boundary of this. This is called the circle of confusion. I
Well, there's an example in the picture below.
So
if the circle of confusion is less than the size of a pixel,
it will affect it will appear to be in focus. If
let's figure 510 i
It looks like somebody's thumb is in the picture.
So that's a lot of defoc,
that's a lot of depth of field. And
so a large circle of confusion will lead to blur from being out
of focus.
Can you go back to B so small lens after and then scroll down.
CS so there's more on the desk that's in. It's clear in that
one where in the other one there's less focus,
and then the backgrounds and stuff is more out
of focus. Oh, wrote a time 17 after
this would be a Good one to test with The Image tool diff and
you? Okay? Well, thank you for today, and we'll see you on
Thursday. Any questions or concerns, will you remarkable?
Yes, I will. Sorry, further delay. Oh, you're a busy guest.

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