Mtg 9/26: Tue-04-Feb-2025
Outline for Today
Radiometry, Spectra, and Colour
Administration
- Happy Tuesday
- Attendance
- Class calendar for today
- Upcoming events
Today
- Radiometry, Spectra, and Color
For Next Meeting
Wiki
Link to the UR Courses wiki page for this meeting
Media
Transcript
Zoom Audio Transcript
- Okay, I think that's recording little picture of myself in the corner of the screen. Now, thank you. Yeah, I know. So I want to look at. hey. on the screen is because it's got names associated with the responses. So I don't want to. Yes. nice one it so this is. These are the choices I had. so we'll have 3 assignments using Pbrt. Then I could give the option of having one assignment and a project or something in between. So the responses I have so far 3 like this, 2 and 2 also added time to the survey. So if you want to, if there's anyone who and write a response. You can. I think other people have replied. Yes, it's under participation. The one anyone is really keen on doing a project. You can do that. Tell me if you're keen on doing implementation. just make sure that that you understand what's going on or what's required. Create the other piece to make up the choice. 3 available. That makes sense assignment one. Take the simple PBRT. Well, I don't. Oh, go ahead and forget. Drive hidden through Co. 1, 35. I will oops official version of this tonight. Yeah, that's inspiration. From the desktop tetrahedron image that I showed you. I stay, create a new interpretation. Interesting features. Test this. What I propose for assignment 3 is. Oh, file future guide. That's 1 place where, on the load features based on somebody's paper. Live reports, having a look at one of those papers writing a summary of it, and then using Pbrt to explore the future parameters, demonstrate or test demonstrated to test the feature Tbr key. So you can see the changes. Yes, I can show you my screen now. So trying to run the Croken image. I believe, caused a segmentation fault because I ran out of memory. So we'll try running it again here. So I'm using options to give me stats. and I've set the log level to be verbose. So get more information samples per pixel is 8, and we're using the wavefront integrator was camera 4. Maybe the issue is, they've misspelled lounge too long. So we have 26 million nodes for 13 million primitives. Nope. you can see physical memory. 15 GB used 15 MB free. Exciting as this is, we'll stop this one. So these are similar settings. So did stats, log level, verbose. And I'm using wavefront and 128 samples per pixel. This is a very simple scene. So you can see we're getting right into allocating work. 4 samples right away. We see that we're only using 10 GB of physical memory. Okay? So that's 1, let's do another using the integrator specified in the input file. So with the standard setup. We have one out of gamut pixel. So that's not too bad. Just expecting to see when a little bit of difference. But yeah, there's difference here. Let's see, all you can see is kind of the light there's there's like there, it's there. That's the kind of stuff I 1, 2, 2 explore in the 1st assignment. does it seem? Okay. someone take pictures of the board for me. Okay, thank you. My email, not email is fine. So I apologize, not having indicated 4.2 and 4.3 preparation super bad. Yes. So the solid angle is the like an object projected onto the sphere, and then further project that onto like a disk inside of the sphere is to the so that helps in computation. This flows off a tongue, doesn't it. Your view neglects a lot of the materials like surface properties, like, for instance, that glass material. It wouldn't really compute much about the light going through that material or help reflects while going through, and the mirroring effects and stuff like that. So I mean, pay attention to the inner as part of it. 5%, whereas the long and hard to say one is, it does all that stuff. There's also the effect of like some materials that aren't like translucent like skin is semi opaque. but if you shine like a light through your hand, you can see that the light scatters inside of the surface as it reflect inwards and then back outwards. And so the key difference that I was looking for years. And then message travels distance. That makes sense. So what does it mean? So look at color next week, next next week next meeting. But this is just to foreshadow a little bit. So what's your understanding of gamut that we have out of gamut pixels couldn't process physically cannot display the colors that are needed displayed within our color spectrum. Yeah. So oh. oops sleep in some particular color. Or Rgv. yeah, so is talk a lot about physical. physically based rendering so spectra fits into that quite well. But then we have to consider how people will perceive the color. Oh, one Gb. red, green, and blue. So we have this idea of a tri-state in this colored fairy. Try the 3 stimuli correspond to red, green, and blue. So the way the display works is there are red, green, and blue colors, and and each pixel resolution at resolution of each pixel and display don't even. And then color. We're setting values for red, green, and blue. We make the red, green, and blue effect right? Colors that we can represent. and international in college. All international bodies have French names, it seems. and device is colors that you can get by combining red, green and blue are available to us from display. So there might be some differences between monitors. Talk about good friend approaches for dealing with that makes sense way to convert between spectra and colors. Well, the things we discussed today really seem okay. All right. I'm sorry I didn't have more stuff on the page, for today's meeting. Something came up this morning that I need to deal with. So focus on the section dealing with color for next meeting. You can read the. It's not the next one, but you can read ones in between if you like, but we'll be focusing on color next time. Okay. thank you for today you don't have a midterm schedule in. When do you have? I thought I did have a date for the midterm? Maybe I'm logged. Oh, look again! It's the Thursday after the break. and we'll cover everything up to the break. We're on Tuesday. Oh, I invite your suggestions for exam questions. anyway, we're out of time. So thanks again for today. Take care! Stay warm. See you on Thursday. Now we'll see if I have a recording this or not. Hey? Thank you very much.
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