ICT

GL

SubEdit: A Representation for Editing Measured Heterogeneous Subsurface Scattering

ACM Transactions on Graphics (Proceedings of SIGGRAPH 2009)

Ying Song^1,2 Xin Tong² Fabio Pellacini³ Pieter Peers⁴

Zhejiang University, State Key Lab. of CAD&CG¹
Microsoft Research Asia²
Dartmouth College³
University of Southern California, Institute for Creative Technologies⁴

Different edited versions of a measured heterogeneous yellow wax material applied to the Buddha model. Left: A rendering of the original material applied to the model. Middle: Material painting: a different measured blue wax material is painted over selected parts of the Buddha model. The interface between both materials is automatically handled by SubEdit. Right: Pattern copy-and-paste: a pattern is copied from a measured chessboard dataset and pasted on the yellow wax.

Abstract:

We present SubEdit, a representation for editing the BSSRDF of heterogeneous subsurface scattering acquired from real-world samples. Directly editing measured raw data is difficult due to the non-local impact of heterogeneous subsurface scattering on the appearance. Our SubEdit representation decouples these non-local effects into the product of two local scattering profiles defined at respectively the incident and outgoing surface locations. This allows users to directly manipulate the appearance of single surface locations and to robustly make selections. To further facilitate editing, we reparameterize the scattering profiles into the local appearance concepts of albedo, scattering range, and profile shape. Our method preserves the visual quality of the measured material after editing by maintaining the consistency of subsurface transport for all edits. SubEdit fits measured data well while remaining efficient enough to support interactive rendering and manipulation. We illustrate the suitability of SubEdit as a representation for editing by applying various complex modifications on a wide variety of measured heterogeneous subsurface scattering materials.

Material:

SIGGRAPH 2009 Paper:

SIGGRAPH2009_SubEdit.pdf, 10.0 MB. ( Adobe Acrobat )

SIGGRAPH 2009 Supplemental Material:

SIGGRAPH2009_SubEdit_Suppl.pdf, 218 KB. ( Adobe Acrobat )

SIGGRAPH 2009 Video (4:59 min):

SIGGRAPH2009_SubEdit.divx.avi, 25.6 MB. ( Divx )

Related Projects:

Surface Reflectometry:
- Spatially Varying Subsurface Scattering, VMV 2006
- Practical Modeling and Acquisition of Layered Facial Reflectance, ACM SIGGRAPH Asia 2008