Interactive Graphics 23 - Ambient Occlusion & Soft Shadows

Рет қаралды 10,245

2 жыл бұрын

Interactive Computer Graphics.
School of Computing, University of Utah.
Full Playlist: • Interactive Computer G...
Course website: graphics.cs.utah.edu/courses/...

Пікірлер: 28

@gloriousptr 2 жыл бұрын

It was really well explained, infact thank you for the whole series.

@alex-shortt 2 жыл бұрын

thank you for making these public!!

@yoyonel1808 Жыл бұрын

Other solutions/researchs on this topic: - Voxelisation [sort of Raytrace] in an octree in realtime (full GPU support), very good/interesting work done by Cyril Crassin (working in NVidia Research) - Soft Shadow Volume : geometric extension of Shadow Volume for soft shadows, performed initially by Ulf Assarsson very nice paper on this topic - Soft Shadow Maps (Efficient Sampling of Light Source Visibility) : (one proposed) extension of Shadow Map for soft shadows, proposed initially by myself ^^ A geometrical extension of pixel from shadow mapping considering/transforming in this method into "micro-facet" (aligned with light camera view), this transformation help to transform pixel/point shadow to micro-face/quad shadow 🙂 - Temporal shadows : using the historic of shadow rendering to increase the precision/resolution with temporal "smart" blending frames after frames. Very interesting topic ! - and so many others ^^ Hard topic, it's a good try to introduce the problematic !

@fatemermg7490 2 жыл бұрын

You are awesome!! Thank you for uploading all these great lectures.

@caiyueli2235 2 жыл бұрын

love all your lessons, they are pretty helpful for me ! thank you professor !

@DeanEdis 2 жыл бұрын

Such a cool explanation! I create raymarched scenes a lot, where the signed distance field can be used to quickly generate an AO approximation. So effective!

@skyheart_dev Жыл бұрын

I like the way you explain this. Subscribed. It would be great to see more videos on simulating softbodies/rigidbodies - more softbodies because they are cool :)

@mobilemusic1633 9 ай бұрын

You are SO epic. Gonna do my Masters in Utah just to take your course!

@kubatpav Жыл бұрын

Thank you. Great video!

@PaulEmsley 2 жыл бұрын

12:37 "an example of something" - it's the large ribosomal subunit of an Archaeon. Tom Steitz was the PI for this work and he won a Nobel Prize for it.

@cem_yuksel 2 жыл бұрын

I thought that it was a cool example, but I had no idea about its significance. Thanks for letting me know!

@PaulEmsley 2 жыл бұрын

@@cem_yuksel Thank you for your lectures. Along with the Cherno, ThinMatrix and the BennyBox you have helped me write my own molecular graphics program. When I post a video demoing the SSAO, I'll edit this comment so you can see it.

@Koffiato Жыл бұрын

Çok teşekkür ederim, harika açıklamışsınız hocam

@emreerkan94 2 жыл бұрын

Hocam harika anlatmışsınız

@thominio 9 ай бұрын

1:04:10 unfortuantly the KIT is focused on soft shadows it goes over multiple sessions just over this topic ...

@motbus3 2 жыл бұрын

thanks for the classes :)

@chaver28 Жыл бұрын

very informal video :D you got my sub

@augustvctjuh8423 Жыл бұрын

SSAO sounds like a very nice technique. Would definitely add if I wrote a realtime renderer But imagine if the windows were all blocked off in that classroom (7:24). No light should enter the scene. It might be interesting to take a few thousand samples scattered throughout the viewport to get an average for ambient light, before you do AO. Then you can scale your AO contributions based on it. Or maybe more sophisticated methods already exist :)

@32zim32 3 ай бұрын

Don't get it how you replace part of equation which depends of light direction just by Ka constant

@jordanz6592 Жыл бұрын

Amazing content! struggling to find freely available content on this topic and specifically the equations, is there any more resources potentially available for the public? Im doing a small study on Ambient Occlusion and would just like to have more information about the function and possibly some reliable sources

@cem_yuksel Жыл бұрын

This is a good start: en.wikipedia.org/wiki/Ambient_occlusion

@kubatpav Жыл бұрын

Hello Cem. What do you think, does it make sense to keep AO texture separate from diffuse texture or there are pretty much no benefits so pre-baking it to diffuse texture is absolutely fine? (Unity engine)

@cem_yuksel Жыл бұрын

Illumination, which affects diffuse reflections varies, varies with moving lights/objects. Ambient illumination can be assumed constant, but the diffuse won't be. I would not combine/pre-bake them.

@kubatpav Жыл бұрын

@@cem_yuksel Thank you for reply Cem.

@ostrich_dog 6 ай бұрын

about soft shadows: what if, instead of sampling multiple pixels from the shadow map, i used mip-maps to apply different levels of occlusion? could something like that work?

@cem_yuksel 6 ай бұрын

Perhaps. My student Yang Shen and I worked on this idea some years ago. We could solve many of its problems, but the results were not satisfactory for reasons that would take too long to explain. If you are curious, you can read her thesis: collections.lib.utah.edu/details?id=197818

@ostrich_dog 6 ай бұрын

@@cem_yuksel thank you very much for your answer