What's Going On
jpalisch commented on slide_021 of Wrapup ()

Here is another example of how this is being used. Not only has it been used for training, but now is being implemented to perform remote training.


jpalisch commented on slide_015 of Wrapup ()

I think this photo presents and interesting contradiction within the graphics world. Obviously we want to be able to make things look as realistic as possible, but in practice, although something like this may not be exactly right, it is close enough to the real thing that it's believable. And thus we arrive at a crossroads where we can begin to experiment with what aspects can be compromised in the name of efficiency while still creating a visually appealing and realistic photo.


yuxinh commented on slide_023 of Wrapup ()

Medical students are learning anatomy using Hololens.

https://case.edu/hololens/

https://www.youtube.com/watch?v=gzUTT1Kygo4


yuxinh commented on slide_030 of Wrapup ()

Thank you, Pat, Matt, Brennan, and Peter for this amazing class at this special time!


gmukobi commented on slide_028 of Wrapup ()

Pat mentioned that a few of the issues with this visualization included bars being occluded because of the camera's view and their relative heights varying with distance because of the perspective projection and foreshortening making it a horrible idea for these old and slow early visualization Softwares.

Interestingly, something about this image reminds me of modern city-sim games like Cities: Skyline or SimCity. In these games where you do benefit from seeing the height and other characteristics of your buildings,, the problem of occlusion and not being able to easily see far away things is solved by real-time rendering and a camera that can move, while the issue of perspective can be solved again with a camera you can move around a map or with an orthographic-projecting camera as was common with early -sim and -tycoon games.


gmukobi commented on slide_030 of Wrapup ()

Thank you everyone for a fantastic quarter and a whole lot of hands-on learning about physically based rendering!

For everyone's bookmarking convenience, here are clickable links to the resources in this slide:

https://kesen.realtimerendering.com/

http://www.realtimerendering.com/raytracinggems

https://wjakob.github.io/nori/

https://rgl.epfl.ch/publications/NimierDavidVicini2019Mitsuba2

And the other resources Matt showed us in lecture that aren't on this slide:

http://graphics.pixar.com/library/Reyes/paper.pdf

https://dl.acm.org/toc/tog/2018/37/3#sec1


luuk commented on slide_030 of Wrapup ()

Thank you, Pat, Matt, Brennan, and Peter for an amazing quarter! This class has definitely been a highlight of my journey here.


luuk commented on slide_017 of Wrapup ()

I guess the takeaway for me is that EVERYTHING we see in the real world could influence our perception of a virtual world if these things aren't adequately accounted for. Some visual cues (e.g. perspective), if not present, have more pronounced impact on our perception than others. The items in the slide above show historically how we've recognized and categorized these cues.


markgee commented on slide_009 of Wrapup ()

From lecture: this was significant because the creators wanted to convince the use of computer graphics. It had plants (some of the first), atmospheric effects, rainbows, water reflections.


luuk commented on slide_020 of Wrapup ()

Here is a paper published by NASA on this system. The majority of the simulated systems are running on a Silicon Graphics machine.


markgee commented on slide_017 of Wrapup ()

Related to the next two slides, the visual cues have different functions and so we can prioritise which visual cues/effects we want to strive for within a computational budget.


alecid commented on slide_030 of Wrapup ()

Thank you Pat, Matt, Brennan, and Peter! It was amazing taking class with you and learning so much, it was challenging but so incredibly satisfying to squash bugs on assignment and witness so much cool stuff!


alecid commented on slide_003 of Wrapup ()

I looked into Radiosity as I was curious: https://en.wikipedia.org/wiki/Radiosity_(computer_graphics). (The language I use here may be incorrect) It basically involves baking illumination onto surfaces in a way that is viewpoint independent, hence radiosity. It is how modern games like Battlefield get their amazing light effects, though it comes at the disadvantage of being more computationally expensive, hence if the light source moves, light must be "rebaked".


knazir commented on slide_001 of Wrapup ()

While it's a bit late in the quarter for this, after all that we've learned it's fun to go back and watch videos like this that demonstrate raytracing in a game like Minecraft.


knazir commented on slide_030 of Wrapup ()

Thanks for a great quarter Pat, Matt, Brennan, and Peter! Really enjoyed the class and learned a ton.


jchav commented on slide_010 of Wrapup ()

Here is an article explaining the harm of idealism specifically with females in art. Idealism is not only hard to achieve but also can be harmful because of the unrealistic depictions.


kvchen commented on slide_027 of Wrapup ()

This slide (and the next one) demonstrates that visualizations shouldn't always strive for realism, and images like charts are much more understandable as abstract drawings.


tc commented on slide_009 of Wrapup ()

Here is the link to the related paper.


tc commented on slide_004 of Wrapup ()

Here is the link to the paper by Pixar in 1984.


kvchen commented on slide_019 of Wrapup ()

From lecture, the point of contention of many flight simulators for a long time was which parts of realism they should strive for with the limited computing - was shading more important than textures, should surfaces even be shaded, etc.

An interesting anecdote was that the lack of antialiasing could actually make far-away airplanes more visible, because they would blink in and out of of existence on-screen.


HuaWu777 commented on slide_026 of Wrapup ()

Here is another beautiful one for architectural drawing!


HuaWu777 commented on slide_019 of Wrapup ()

I found an interesting program called SGI Dogfight which is related to this slide.


jchav commented on slide_021 of Wrapup ()

Here are some examples of the types of imaging they are doing at Intuitive


siyuliu3 commented on slide_017 of Wrapup ()

Here are some slides demonstrating different depth cues.


gracer19 commented on slide_023 of Wrapup ()

I hadn't really thought about this part of visualization/graphics--that we can actually create visualizations of things that are better than real life/more helpful for its particular use. But it's a really interesting point!


gracer19 commented on slide_015 of Wrapup ()

Pat mentioned Brunelleschi in lecture (one of my all-time historic favorites--and coincidentally a huge prankster)--here is a blog post about his re-discovery of perspective drawing: https://maitaly.wordpress.com/2011/04/28/brunelleschi-and-the-re-discovery-of-linear-perspective/


amy commented on slide_028 of Wrapup ()

Highly recommend books by Edward Tufte to figure out what makes for a "good" visualization (required reading for 448B)


zchen commented on slide_012 of Wrapup ()

Here is the website about Ralph Goings paintings.


amy commented on slide_012 of Wrapup ()

This is a photorealistic painting :o

This is painted by first taking a photograph and then projecting onto a canvas to paint the photo


Professor Hanrahan mentioned the baby from Pixar's Tin Toy around here in the lecture. I did some digging into the film and found this 1989 NYTimes article. An interesting quote from the article:

The cost of making the award-winning cartoon ''The Tin Toy'' was several thousand dollars per second of running time, according to its creators.

It shows how far computer graphics have come that frames can now be rendered in just minutes on affordable hardware!


siyuliu3 commented on slide_030 of Wrapup ()

Thank you Pat, Matt, Peter and Brennan! Here's a youtube playlist made by Nvidia that goes over some basics of ray tracing. There are a lot of additional resources in the comment section of their videos.


dz commented on slide_030 of Wrapup ()

Thank you Pat, Matt, Peter and Brennan for teaching an amazing class this quarter! It's been an honor to learn from you all


downsampling commented on slide_015 of Wrapup ()

From lecture: this picture will be visually confusing if it is treated as a photograph because it looks as if it is taken from some wide fish-eye lens, but the left part will stretch farther to the left while the right part will stretch farther to the right.


downsampling commented on slide_025 of Wrapup ()

From lecture: these technical illustrations are examples of non-photorealistic renderings that try to imitate drawings.


zchen commented on slide_013 of Wrapup ()

Here is the referencing paper for this figure.


dz commented on slide_015 of Wrapup ()

From lecture: this cannot be a photograph because there is more than one vanishing point. More info here!


amy commented on slide_009 of Wrapup ()

From lecture: Reyes stands for "Renders Everything You Ever Saw"


The difference between direct lighting and global illumination is astonishing...


This is a very interesting short video on how Pixar simulated hair movement for Brave


Is this effect simulated in graphics by simply changing the color/texture of a given model, or is this an effect of the lighting and optics?


Here is an interesting article outlining the Impasto painting technique. It is interesting to see that one of the main uses for this technique was to add depth to a painting, giving it almost a 3D effect. Similarly, computer graphics uses similar ideas to gain a deeper effect, that being subsurface scattering.


Since this lecture, I have tried to look for the reflections in the hair of my family at home, which has been quite entertaining—haven’t yet found the purported ‘circle’ effect yet, but my sample of hair to look at is pretty small in quarantine!


This reminds me of Monet’s style of painting snow, which uses layers of different colors that you wouldn’t normally associate with a field of white : https://denverartmuseum.org/article/did-you-know-monet-painted-more-100-snow-scenes


To elaborate, medulla is the innermost layer of the hair shaft and in humans, the medulla is so thin that it doesn’t lead to significant scattering. This is compared to fur where medulla scattering is non negligible and so a double cylinder model was developed. The authors then went on to obtain parameters for their model for different animals by conducting lighting experiments and saving the results. The models can then be used efficiently using these stored parameters.