Leo ‘Sneezes the day’ in latest AMD tech demo

03 Leo Sneezes the day in latest AMD tech demo

AMD's latest real-time tech demo has just been released for its DX 11-capable Radeon cards. Dubbed Leo, the demo apparently runs fairly well on higher end HD 6000 series cards, but for optimal smooth as glass performance a HD 7900 series card is said to be required.

AMD's latest real-time tech demo has just been released for its DX 11-capable Radeon cards. Dubbed Leo, the demo apparently runs fairly well on higher end HD 6000 series cards, but for optimal smooth as glass performance a HD 7900 series card is said to be required.

The demo weighs in at a slightly chunky 740MB, but the original download link from AMD remains fairly quick, at least for now.

If you'd like to see the demo in action before making the effort to download and run, a 1080p running video has been uploaded on Youtube for your viewing pleasure :-
 

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).

Source: AMD

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