Material Editing in Complex Scenes by Surface Light Field Manipulation and Reflectance Optimization, Eurographics 2013

Material Editing in Complex Scenes by Surface Light Field Manipulation and Reflectance Optimization

Chuong H. Nguyen     Daniel Scherzer     Tobias Ritschel     Hans-Peter Seidel

MPI Informatik    

Paper Abstract

This work addresses the challenge of intuitive appearance editing in scenes with complex geometric layout and complex, spatially-varying indirect lighting. In contrast to previous work, that aimed to edit surface reflectance, our system allows a user to freely manipulate the surface light field. It then finds the best surface reflectance that ``explains'' the surface light field manipulation. Instead of classic L2 fitting of reflectance to a combination of incoming and exitant illumination, our system infers a sparse L0 change of shading parameters instead. Consequently, our system does not require ``diffuse'' or ``glossiness'' brushes or any such understanding of the underlying reflectance parametrization. Instead, it infers reflectance changes from scribbles made by a single simple color brush tool alone: Drawing a highlight will increase Phong specular; blurring a mirror reflection will decrease glossiness; etc. A sparse-solver framework operating on a novel point-based, pre-convolved lighting representation in combination with screen-space edit upsampling allows to perform editing interactively on a GPU.

Materials for Download

Related Publications

	3D Material Style Transfer Chuong H. Nguyen, Tobias Ritschel, Karol Myszkowski, Elmar Eisemann, Hans-Peter Seidel Computer Graphics Forum 31(2) (Proc. Eurographics, Cagliari / Italy, 13–18 May 2012). Paper Project Page
	Pre-convolved Radiance Caching Daniel Scherzer, Chuong H. Nguyen, Tobias Ritschel, Hans-Peter Seidel Computer Graphics Forum 31(4) (Proc. EGSR 2012, Paris, 4–6 June 2012). Paper Project Page
	A PCA Decomposition for Real-time BRDF Editing and Relighting with Global Illumination Chuong H. Nguyen, Min-Ho Kyung, Joo-Haeng Lee, Seung-Woo Nam Computer Graphics Forum 29(4) (Proc. EGSR 2010, Saarbrucken / Germany, 28–30 June 2010). Paper

Citation

Chuong H. Nguyen, Daniel Scherzer, Tobias Ritschel, Hans-Peter Seidel
Material Editing in Complex Scenes by Surface Light Field Manipulation and Reflectance Optimization
Computer Graphics Forum 32(2) (Proc. EUROGRAPHICS 2013), 2013.

  @article{nguyen:2013:MaterialEditing,
   author  = {Chuong H. Nguyen and 
              Daniel Scherzer and
              Tobias Ritschel and              
              Hans-Peter Seidel},
   title   = {{Material Editing in Complex Scenes by Surface Light Field Manipulation and Reflectance Optimization}},
   journal = {Computer Graphics Forum (Proc. EUROGRAPHICS 2013)},
   volume  = 32,
   number  = 2,
   year    = {2013}
  }

Acknowledgements

We would like to thank:
   -Oliver Klehm for the video voice-over and useful discussion.
   -Carsten Dachsbacher for proofreading and suggestions.
   -Bernhard Reinert and Martin Cadik for the internal review.