Charles Loop

Senior Researcher

One Microsoft Way

Redmond, WA 98052

Email: cloop@microsoft.com
last update 3/28/2013

Research Interests:

Computer Graphics, Geometric Modeling, Subdivision Surface Techniques, Surface Rendering, GPU Algorithms, GPU Ray Tracing, RGBD Image Based Modeling.

Education:

Ph.D. Computer Science, University of Washington. 1992. Dissertation: "Generalized B-spline Surfaces of Arbitrary Topological Type".
M.S. Mathematics, University of Utah. 1987. Thesis: "Smooth Subdivision Surfaces Based on Triangles".

MSR Publications:

Matthias Niessner, Charles Loop. "Analytic Displacement Mapping using Hardware Tessellation". ACM Transactions on Graphics, To appear 2013.
M. Niessner, C, Siegl, H. Schafer, and C. Loop "Real-time Collision Detection for Dynamic Hardware Tessellated Objects". Eurographics Proceedings, Girona, 2013
Matthias Niessner, Charles Loop. "Patch-Based Occlusion Culling for Hardware Tessellation". Computer Graphics International, Bournemouth, 2012
Lei He, Charles Loop, and Scott Schaefer. "Improving the Parameterization of Approximate Subdivision Surfaces". Computer Graphics Forum, Vol. 31, No. 7 (2012), pages 2127-2134.
Matthias Niessner, Charles Loop, and Guenter Greiner. "Efficient Evaluation of Semi-Smooth Creases in Catmull-Clark Subdivision Surfaces". Eurographics Proceedings, Cagliari, 2012
Matthias Niessner, Charles Loop, Mark Meyer, and Tony DeRose. "Feature Adaptive GPU Rendering of Catmull-Clark Subdivision Surfaces". ACM Transactions on Graphics, Vol. 31 No. 1 Article 6 January 2012. This research forms the foundation for the GPU algorithms in OpenSubdiv. The paper's original source code, which is NOT the full OpenSubdiv implementation, can be downloaded here.
Charles Loop, Matthias Niessner, and Christian Eisenacher. "Effective Back-Patch Culling for Hardware Tessellation". Proceedings of Vision, Modeling & Visualization, Berlin, 2011
Charles Loop. "Hardware Subdivision and Tessellation of Catmull-Clark Surfaces". Microsoft Research Technical Report, MSR-TR-2010-163. 2010
Christian Eisenacher and Charles Loop. "Data-parallel Micropolygon Rasterization". Eurographics Proceedings, Norrköping, 2010
Kirill Garanzha and Charles Loop. "Fast Ray Sorting and Breadth-First Packet Traversal for GPU Ray Tracing". Eurographics Proceedings, Norrköping, 2010
Charles Loop, Scott Schaefer, Tianyun Ni and Ignacio Castano. "Approximating Subdivision Surfaces with Gregory Patches for Hardware Tessellation". Siggraph Asia Proceedings, Yokohama, 2009
Charles Loop and Christian Eisenacher. "Real-Time Patch-Based Sort-Middle Rendering on Massively Parallel Hardware". Microsoft Research Technical Report, MSR-TR-2009-83. 2009
Christian Eisenacher, Quirin Meyer and Charles Loop. "Real-Time View-Dependent Rendering of Parametric Surfaces". I3D '09: Proceedings of the 2009 Symposium on Interactive 3D Graphics and Games, Boston, 2009
Charles Loop and Scott Schaefer. "G2 Tensor Product Splines over Extraordinary Vertices". Proceedings of the Symposium on Geometry Processing, Coppenhagen, Denmark 2008 Download basis functions.
Charles Loop and Scott Schaefer. "Approximating Catmull-Clark Subdivision Surfaces with Bicubic Patches". ACM Transactions on Graphics, Vol. 27 No. 1 Article 8 March 2008
Charles Loop and Jim Blinn. "Rendering Vector Art on the GPU". GPU Gems 3, Chapter 25, Addison Wesley, 2007 Errata.
Charles Loop and Jim Blinn. "Real-Time GPU Rendering of Piecewise Algebraic Surfaces". Siggraph Proceedings, Boston, 2006
Charles Loop and Jim Blinn. "Resolution Independent Curve Rendering using Programmable Graphics Hardware". Siggraph Proceedings, pages 1000-1010, Los Angeles, 2005
Charles Loop. "Second Order Smoothness over Extraordinary Vertices". Proceedings of the Symposium on Geometry Processing, pages 169-178, Nice, France, 2004
Jos Stam and Charles Loop. "Quad/Triangle Subdivision". Computer Graphics Forum. Volumn 22, Number 1, 2003, pages 1-7
Charles Loop. "Smooth Ternary Subdivision of Triangle Meshes". Curve and Surface Fitting: St. Malo 2002
Charles Loop. "Bounded Curvature Triangle Mesh Subdivision with the Convex Hull Property". The Visual Computer, (2002) 18:316-325. Synopsis.
Z. Zhang and C. Loop. "Estimating the Fundamental Matrix by Transforming Image Points in Projective Space". Computer Vision and Image Understanding, 82(2):174-180, 2001.
Z. Zhang, Y. Shan and C. Loop. "Object Modeling from a Casual Collection of Images". In the Fourth Asian Conference on Computer Vision (ACCV), pages 905-910, Taipei, Taiwan, January 2000.
Charles Loop. "Managing Adjacency in Triangular Meshes". Microsoft Research Technical Report, MSR-TR-2000-24. 2000
C. Loop and Z. Zhang. "Computing Rectifying Homographies for Stereo Vision". IEEE Conf. Computer Vision and Pattern Recognition (CVPR'99), Vol.I, pages 125-131, Colorado, June 1999.