AMD Radeon HD 7900 Real Time Demo: Leo

[caveman-jim]

From the create of ATI's Toy Shop demo, comes the AMD Radeon HD 7900 real time demo, 'Leo':

The Leo demo showcases a real-time, DirectX® 11 based lighting pipeline that is designed to allow for rendering scenes made of arbitrarily complex materials (including transparencies), multiple lighting models, and minimal restrictions on the number of lights that can be used -- all while supporting hardware MSAA and efficient memory usage.

Specifically, this demo uses DirectCompute to cull and manage lights in a scene. The end result is a per-pixel or per-tile list of lights that forward-render based shaders use for lighting each pixel. This technique also allows for adding one bounce global illumination effects by spawning virtual point light sources where light strikes a surface. Finally, the lighting in this demo is physically based in that it is fully HDR and the material and reflection models take advantage of the ALU power of the AMD Radeon HD 7900 GPU to calculate physically accurate light and surface interactions (multiple BRDF equations, realistic use of index of refraction, absorption based on wavelength for metals, etc).

Download it, and movie, from AMD Developer Central [registration required].

[Swiftdeathz]

Looks very cool, kinda like stop motion animation. I wanted to download the movie, but unfortunately it's currently giving me an error: File not found

http://media.amddevcentral.com/video/Leo_1080p.mov

[gamekill]

I can't download the movie file either..

[caveman-jim]

I've notified AMD, hopefully they will fix it soon.

The demo is of Leo, the old man, making a stop motion film, and the characters have a life of their own when a string breaks. It's cute, it's fun, and looks (to me) like a pre-rendered film short from Pixar.

[Hippo]

i keep getting an error when installing it, saying one of the .cab files is corrupt.

[caveman-jim]

Downloaded and installed fine on my PC, even runs on my HD 5750 at work.

[Qb2k5]

I will see if it runs on my 470.

[Arghuin]

I will see if it runs on my 470.

Do tell the results....I just watched the vid, looks like the best demo AMD/ATi have produced in a LONG time. Great concept, nice gfx and a lot of tongue-in-cheek directing. We need moar stuff like this from the big companies

[Qb2k5]

It runs but quickly gobbles up all the 1.2GB of memory on the 470 at 720p and at 1080p. All the textures are black so the demo on nvidia hardware is pretty useless.

EDIT: Here are some shots ran at 800x600. Even at 800x600 all the ram is gone. . It must of been hard coded to take advantage of the 3GB ram on the 7970 gpus.

[caveman-jim]

EDIT: Here are some shots ran at 800x600. Even at 800x600 all the ram is gone. . It must of been hard coded to take advantage of the 3GB ram on the 7970 gpus.

I ran it in a window on a 5750 1GB.

[Sasquach]

The video link is updated, so the above poster doesnt have the working one:

http://media.amddevcentral.com/video/gpu_videos/Leo_1080p.mov

[caveman-jim]

The video link is updated, so the above poster doesnt have the working one:
http://media.amddevcentral.com/video.../Leo_1080p.mov

he's running the demo, not the video...

[Arghuin]

I ran it in a window on a 5750 1GB.

ATi-hardcoded then? A pity

[Dr. Zhivago]

Maybe if Nvidia developed hardware based on actual DirectX specs instead of some random specs that they pay millions of dollars to game developers to support while doing their best to keep AMD out of those games, this AMD demo might run on their hardware...

[Hippo]

It runs but quickly gobbles up all the 1.2GB of memory on the 470 at 720p and at 1080p. All the textures are black so the demo on nvidia hardware is pretty useless.

EDIT: Here are some shots ran at 800x600. Even at 800x600 all the ram is gone. . It must of been hard coded to take advantage of the 3GB ram on the 7970 gpus.

On my 5850 it was at 999mb, but was still smooth.

[Ghoststalker]

I'm getting the corrupted cab file error as well. Any fixes?

[Hippo]

i noticed that it wasn't downloading the whole file, I only got 131mb of it, so i downloaded on another computer and it got the whole thing. One thing you might try is using a different browser.

[Ghoststalker]

Yes, when I managed to download all 700mb it worked great!