Real-Time High Quality Rendering

1
Real-Time High Quality Rendering

• COMS 6160 Fall 2004, Lecture 3
• Overview of Course Content

http//www.cs.columbia.edu/ravir/6160
2
To Do

• By tomorrow midnight, e-mail me ordered list of
  (at least) 4 papers for presentation
• Papers will be assigned on a first-come
  first-served basis
• If you dont respond, you will be assigned and
  have to do papers randomly (including possibly
  next week)
• Start thinking about your projects (for those on
  grades). Project descriptions required in 2
  weeks. A good idea is to choose to present
  papers relating to your intended project.
• This brief lecture previews the papers/topics in
  the course

3
3 basic themes

• (Programmable) graphics hardware
• Precomputation-based methods
• Interactive ray-tracing/global illumination
• Some overlap between these (e.g. algorithmic
  improvements based on precomputation, followed by
  hardware rendering)

4
Outline of papers/topics covered

• Graphics hardware
• Classic papers (today)
• Programmability/tricks for high-quality rendering
  (next)
• General programmable shading systems (Sep 29)
• Shadow mapping (lecture Oct 6, papers Oct 13)
• Precomputation-based methods
• General environment mapping (complex lighting)
  (Oct 20)
• Factored BRDF representations (Oct 27)
• General precomputation-based methods (Nov 3, 10)
• Interactive ray-tracing/global illumination (Nov
  17, Dec 1)

5
High Quality Hardware Shading (next)

• Heidrich 99, one of first papers. Hardware
  tricks (before
  current programmable
  graphics in standard OpenGL)
• Purcell et al. 02, map ray tracing to standard
  
  programmable hardware scanline pipeline
• Lindholm et al. 01, first nVidia vertex shaders
  (GeForce 3)

6
General Programmable Shading (29)

• First programmable shading systems for hardware
• Peercy et al. 00 Multipass OpenGL implementation
  of RenderMan (OpenGL as general SIMD machine)
• Proudfoot et al. 01 Multiple computation
  frequencies (precursor to vertex, fragment
  shaders)
• Mark et al. 03 Describes nVidias Cg one of
  first commercial high-level shading languages for
  programmable hardware

7
Shadow Mapping (Oct 13)

• Classic technique to add complex curved shadows
• Williams 78, oldest paper we discuss in course
• Many recent extensions for programmable hardware
• Soft shadows Agrawala 00
• Complex geometry like hair Lokovic and Veach 00
• Adaptive techniques Fernando 01, Stamminger 02,
  Sen 03

8
Outline of papers/topics covered

• Graphics hardware
• Classic papers (today)
• Programmability/tricks for high-quality rendering
  (next)
• General programmable shading systems (Sep 29)
• Shadow mapping (lecture Oct 6, papers Oct 13)
• Precomputation-based methods
• General environment mapping (complex lighting)
  (Oct 20)
• Factored BRDF representations (Oct 27)
• General precomputation-based methods (Nov 3, 10)
• Interactive ray-tracing/global illumination (Nov
  17, Dec 1)

9
Complex Lighting, Materials (Oct 20)

• Cabral et al. 99, first use of
  
  environment maps and
  general
  materials
• Ramamoorthi 02, frequency domain approach (DEMO)

10
Factored Texture Maps (Oct 27)

• Many high-dimensional functions (BRDFs, Light
  Fields) can be factored into lower-dimensional 2D
  textures for hardware
• Mccool 01, BRDFs
• Latta 02, Environment maps with general materials
• Chen et al. 02, Surface light fields

11
Precomputed Transfer (Nov 10,17)

• Precompute on static scenes, followed by
  real-time relighting, changing view. Can capture
  most complex shading effects.
• Sloan et al. 02,03 Low-frequency SH, compression
• Ng et al. 03, 04 Wavelets all-frequency,
  relight, view change
• Sloan 04, Wang 04 Factored BRDFs all-frequency
  relighting

12
Outline of papers/topics covered

• Graphics hardware
• Classic papers (today)
• Programmability/tricks for high-quality rendering
  (next)
• General programmable shading systems (Sep 29)
• Shadow mapping (lecture Oct 6, papers Oct 13)
• Precomputation-based methods
• General environment mapping (complex lighting)
  (Oct 20)
• Factored BRDF representations (Oct 27)
• General precomputation-based methods (Nov 3, 10)
• Interactive ray-tracing/global illumination (Nov
  17, Dec 1)

13
Interactive Global Illumination

• Eurographics STAR report reviews state of the art
• Two recent papers
• Tole et al. 02, dynamic scenes
• Bala et al. 03, combining edges and points