Category: Research

Together with Régis Portalez, we proposed an optimized algorithm for octree ray traversal. The algorithm based on the expression of rays in Plücker coordinates reduces mathematical operations required to calculate ray-box intersections.

This work was presented at Journées Reims Image in november 2014 : http://reimsimage2014.univ-reims.fr/afig-2014/

This work has been archived in HAL : https://hal.archives-ouvertes.fr/hal-01281450

In a collaborative work with University of Catalunya, we developed a volume rendering algorithm based on summed area tables. The calculation of the tables was done in CUDA for better performances.

This work has been published in Compute and Graphics Volume 34, Issue 4, in August 2010. https://doi.org/10.1016/j.cag.2010.03.005

In this work we propose a visually high quality rendering technique of large point data-sets. From a large point data set, we extract a coarse mesh, build patches and project input samples on those patches. The input samples are then used to generate a normal map of these patches enabling rendering at high framerate with high visual quality.

This work has been published at the 6th International Symposium on Virtual Reality, Archaeology and Cultural Heritage (VAST) 2005. http://dx.doi.org/10.2312/VAST/VAST05/075-082

In this work, we developed a reconstruction technique for large point data-sets. From points with normals, we extrapolate a hierarchical signed distance function that can be evaluated at multiple resolutions, with offsetting.

ACM SIGGRAPH 2005 POSTER

Research Report in HAL: https://hal.inria.fr/inria-00070455

During this project, cultural heritage artifacts have been scanned using range scanners. For archeologists to document the findings the 3D artifacts are re-projected in 2D with unfolding of a cylinder. In this work we propose and implemented a sky-dome based approach to calculate a lighting that highlights details on these unfolding images.

INRIA Research Report : https://hal.inria.fr/inria-00606750

French Publication : https://hal.inria.fr/inria-00606751

Eurographics DL : http://dx.doi.org/10.2312/VAST/VAST04/105-114

In this work we developed data structures and rendering techniques for point data-sets with the contraints of mobile devices. We studied the cost of data structure with attributes attached to point samples, and a one-pass shadow algorithm enabled by this data structure.

This work has been archived as a technical report and published in a special issue of IEEE Computer Graphics and Applications.

HAL deposit of tech report – https://hal.inria.fr/inria-00071753/ – May 2003

IEEE-Explore – https://ieeexplore.ieee.org/document/1310212

Published in IEEE Computer Graphics and Applications ( Volume: 24 , Issue: 4 , July-Aug. 2004 )

In this work, we present the benefit of using second-order surface approximations for filtering point data-sets with normals. Point data from multiple range scanner acquisitions suffer a registration noise due to approximations in registrations. This approach aims at reducing these position errors, while using normal information with second order polynomial surfaces. Pushed further, this filtering technique can push curvature of the surface on edges resulting in a edgy surface.

INRIA Research Report : https://hal.inria.fr/inria-00071424

This work describes implementation tips and notices to implement the robust epsilon visibility skeleton. Implementation details of robust epsilon visibility paper in Siggraph 2002 are detailed in this document with a review of previous work.

INRIA Research Report : https://hal.inria.fr/inria-00071422

In this work, we extend the visibility skeleton to be robust on calculation precision errors using robust hit predicates. This results in higher number of degenerate configurations and a better support for small and sliver edges and complex scenes.

This work has been published at Siggraph in 2002 : https://dl.acm.org/citation.cfm?doid=566654.566618