Mtg 12/26: Thu-13-Feb-2025

Outline for Today

Cameras and Film

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Audio Transcript

  • It seems like the app has changed. The otter.ai app
  • has changed without letting me know.
  • Okay, I
  • that's our last few before the break.
  • Everyone excited about the break
  • and tomorrow's Valentine's day too. I
  • Okay, so we're in chapter five, talking about cameras and film.
  • So I have an image open. Doesn't look I have an image open. So
  • I'm trying, I'm setting up this, the simple TBR key file with
  • different cameras. I
  • so the example with realistic camera
  • is copy This is the plane I had To specify the
  • lens file And
  • okay, so let's start with a realistic one and see whether we
  • can. I
  • and get An image of It.
  • It is pretty realistic. If I shut the lights off, it'll look
  • just like that. Yeah,
  • let's see if we do a
  • Log levels.
  • I You, There's a Light. I
  • let's make a larger aperture. Change the focal distance to 100
  • instead 10. Original. I
  • Oh, that's something
  • I it's Quite a fish. Highlights, yes, I
  • so I'm using lens data from
  • scenes, arc, Scenes repository. I
  • so let's try a different One.
  • I there's a warning.
  • There aperture diameter is too big.
  • I sure isn't capturing much.
  • I change the aperture diameter back to one,
  • number bigger than zero by hanging. Let's
  • go. Comment This out to
  • but if you left the focus distance at 100 but change the
  • aperture diameter to see five. I
  • think that would get rid of the
  • warning, put turn the focal distance back to 100. I think
  • that was what Let's
  • try this first.
  • I there? Yeah, I so let's try a different lens. You
  • let's try And tell US photo I
  • Let's go Back to our wide more efficient so
  • I looked at the files, there's a y dot dot file. We
  • haven't tried the ghost 50 millimeter. So
  • so I don't know that that
  • the ones without the side the million, millimeter
  • specification are intended as inputs. I'm
  • looking at the way that some people form and stuff. Maybe you
  • have to put them inside of square brackets for the aperture
  • diameter, look at that five point, because everything else
  • is in square brackets. So should that 5.0 also be in square
  • brackets? Can the 102
  • here's an example that's not in brackets. Same with
  • the black body down the bottom. Just
  • all the examples. I'm finding online, I'm trying to
  • troubleshoot as well.
  • I don't think it's it's not having problems reading the
  • file. I believe I
  • oh, let's add another light.
  • What is the shutter signs you're using?
  • Yes, That's a good point. I forgot about that.
  • Thank You. You
  • fire, cool. Let's Make it. Locker.
  • Still together.
  • It sounds really great. There's another setting called
  • sensitivity. I don't know if you've changed that one.
  • I i guess ISO would be the One.
  • So that's the film
  • parameter. So we can specify the sensor, The sensor response for
  • RGB and
  • I tend to white balance. Yeah, they're talking about that a lot
  • More Chapter Two,
  • there are a lot of pixels out of
  • gamut. There we go. I think
  • I think the white balance value might have been too high. Yeah,
  • I've used the white balance on my camera to take pictures of
  • like stars when it was like minus 50 outside. So it's a lot
  • more comfortable doing that when it's not minus 50 in here, 13
  • second exposure times I'm
  • so I wanted to show the other ones as Well,
  • especially now that we can see the image
  • the other ones, because they're not realistic. I A came up with.
  • So here's the orthographic and
  • why is it so zoomed in?
  • I'm just using the default setting. So that's,
  • I know the other one zoomed In because of the camera choice,
  • but I
  • Oh, their recommended focal Distance is 10 to the power of
  • 30. Jesus, I
  • yeah,
  • I think that's just a very large number. Yeah, I
  • so I do wonder what would what would happen if we did 10 to the
  • power of third i
  • I'll leave that for you to try That's Fair. I
  • let's put The eye point a little further away, maybe
  • that's too much say 916, E, I
  • think you could have left the Other two the same and just
  • changed The Z. So
  • you change the file name from example pbrt to orthographic
  • pbrt. So there's another one that's the pbrt file at the png
  • you Change right? I
  • I think I've done that correctly. I
  • that looks very zoomed in I don't
  • think it likes the lens radius.
  • Yes, I the
  • recommended was like, what Zero or like one or Whatever. So
  • that's cool. You there do a high render, do a high distance, but
  • a small diameter. Because, again, the default setting was
  • like zero and then 10 to the 30, like it wants a really far
  • render distance. So
  • oh, it's giving you a higher time, And I think that's A good
  • sign. I
  • let's just turn Off lens features and
  • there You Go. You
  • that's interesting. Take just change, is it
  • not in terms of x, y, z?
  • Yes, that's X, Y and Z.
  • It doesn't seem like The Y changed. I,
  • it doesn't seem to update when the windows in focus. So if we
  • were to click it again, it might update. There we go. So why does
  • it treat the z like the Y? It
  • didn't. So here we're looking we've increased z. So we're
  • looking at the top of the sphere. Four said was the
  • is it because we are looking down at 0.5 0.5 so if we
  • increase the Z between moving upward, do
  • it made sense to me, but I see your point.
  • Yeah, That's kind of Bizarre. I
  • uh, B and B to increase the exposure brightness, There's
  • capital
  • B for increased so
  • which one did you use their capital B or lowercase p,
  • pardon Me, capital B, cool, I.
  • I like how it's interactive, like because then you can watch
  • it re rendering, it kind of neat.
  • I like that rendering part CS to use q and E to move the camera
  • Up and down. I think You just did that. I
  • i think you still have to become the thing to hit the scene.
  • Maybe, maybe
  • I here and then ANC, I think that brings up the transform
  • position. I'm gonna be wrong.
  • Do so I wasn't sure about if the window had focus or the
  • terminal. Seems like, yeah, I but the
  • controls are not very intuitive, because it's not, I don't think
  • it's relative to the camera. I think it's relative to world
  • space. It's pretty hard to tell. I
  • You can use the arrow keys to maneuver like the
  • orientation of the Camera,
  • which might be sufficient for what We're doing. You
  • so we're at the end of our Day today. We did, I'm sure. Link we
  • so this is related to the question about mosaics and
  • so you can imagine each of the squares in gray are a sensor,
  • and then a tiny little
  • filter is put over sensor so,
  • so it's reading red, green or blue. So what do you notice
  • about this? There's green ones. There are red and
  • blue. Red,
  • yeah,
  • yeah, there's green on every row where Red and Blue are only on
  • every other
  • row, yeah. So if we take two by two and two green, a blue and a
  • red. So we need to demosaic this for the final image. We
  • excuse me, cool, let's end it there. Thank you for your
  • patience and input today. Applause.
  • It so it's a starting off point for you to become familiar with
  • the camera and film parameters, and I'll post these experiments
  • we did in class. Have a good break
  • this class up to the end of Chapter Five is on the midterm,
  • yes, and we're starting chapter six when we come back.

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