Jeppe Revall FrisvadAssociate Professor in Computer Graphics, M.Sc.(Eng.), Ph.D.
Technical University of Denmark
FlexDraper: An Intelligent Robot-Vision System for Draping Fiber Plies [2016-2019]
Participant. Project funded by Innovation Fund Denmark.
QRprod: QR Coding in High-Speed Production of Plastic Products and Medical Tablets [2016-2019]
Participant. Project funded by Innovation Fund Denmark.
Eco3D: The Cyber-Physical 3D Ecosystem [2014-ongoing]
Co-founder. Some project participants are funded by MADE (Manufacturing Academy of Denmark) and some by DTU Compute.
Digital Prototypes [2011-2012]
Co-applicant. Project funded by the Danish Council for Technology and Innovation (Resultatkontrakt).
Desktop Scientific Computing (GPUlab) [2010-2013]
Co-applicant. Project funded by the Danish Council for Independent Research - Technology and Production Sciences (FTP).
Center for Imaging Food Quality (CIFQ) [2010-2015]
Participant. Project funded by the Danish Council for Strategic Research.
|Dal Corso, A., Frisvad, J. R., Mosegaard, J., and Bærentzen, J. A. Interactive directional subsurface scattering and transport of emergent light. The Visual Computer, 2016. To appear. [abstract] [video] [lowres pdf]|
|Eiriksson, E. R., Luongo, A., Frisvad, J. R., Pedersen, D. B., and Aanæs, H. Designing for color in additive manufacturing. In Proceedings of ASPE 2016 Summer Topical Meeting on Dimensional Accuracy and Surface Finish in Additive Manufacturing, June 2016.|
|Dal Corso, A., Frisvad, J. R., Kjeldsen, T. K., and Bærentzen, J. A. Interactive appearance prediction for cloudy beverages. In Workshop on Material Appearance Modeling (MAM2016), pp. 1-4, The Eurographics Association, June 2016.|
|Andersen, T. G., Falster, V., Frisvad, J. R., and Christensen, N. J. Hybrid fur rendering: combining volumetric fur with explicit hair strands. The Visual Computer (Proceedings of CGI'16) 32(6), pp. 739-749, June 2016. [abstract] [video] [lowres pdf] [slides]|
|Abildgaard, O. H. A., Frisvad, J. R., Falster, V., Parker, A., Christensen, N. J., Dahl, A. B., and Larsen, R. Noninvasive particle sizing using camera-based diffuse reflectance spectroscopy. Applied Optics 55(14), pp. 3840-3846, May 2016. [abstract]|
02941 Physically Based Rendering and Material Appearance Modelling (since spring 2016)
Course responsible and course designer. PhD course.
02562 Rendering - Introduction (since Autumn 2011)
02561 Computer Graphics (since Autumn 2015)
02525 Introduction to Mathematics and Technology (since Autumn 2010)
Course responsible. Freshman course taught for the B.Sc. education in Mathematics and Technology.
WebGL demonstrator for exploring noise functions. [Not working in Internet Explorer.]
This demo illustrates the qualities of sparse convolution noise as presented in my paper from GRAPHITE 2007,
but here implemented as a GLSL ES function.
Rendering Framework has been updated for the course 02941 Physically Based Rendering.
WebGL example of my onb method. It is here used to generate a consistently oriented tangent space.
WebGL examples developed for the course 02560 Web Graphics and Scientific Visualization.
See the links in the section called Lecture Examples.
WebGL example of our directional dipole for subsurface scattering is now available.
It accompanies the abstract of our paper to appear in ACM Transactions on Graphics.
dirpole code has been released.
This is a simplistic example implementation of our directional dipole model for subsurface scattering.
It accompanies a publication to appear in ACM Transactions on Graphics.
LMabs code has been published in a Matlab version.
This is code for computing the scattering properties of participating media using Lorenz-Mie theory.
It accompanies a publication that appeared in ACM Transactions on Graphics (Proceedings of ACM SIGGRAPH 2007).
There has been much discussion and many misunderstandings about the work of the remarkable Danish scientist Ludvig Lorenz (1821-1891) on the theory of light scattering of a plane wave by a spherical particle. This theory is often referred to as Mie theory. In "The Scattering of Light and other electromagnetic radiation", Academic Press, 1969, Kerker presents a historical investigation of the origins of the theory and concludes:
It is not the intention of this author to arbitrate the questions of priority raised here nor to identify the theory of scattering by a sphere with any one man's name. Indeed, coincident and consecutive discoveries are common occurrences in science. But certainly if this theory is to be associated with the name or names of individuals, at least that of Lorenz, in whose paper are to be found the practical formulas so commonly used today, should not be omitted.
Nevertheless, some authors prefer to call it Mie theory rather than Lorenz-Mie theory. Perhaps because of the widespread supposition that Lorenz's theory relies on the existence of an ether. Reading the first pages of Lorenz's article, it is clear that this is certainly not true (see the translation below). Lorenz explicitly states that light propagation is like the laws for transmission of electricity and electrical forces and that this differs from the theory of elasticity. To uphold the recommendation that the theory of scattering of a plane wave by a spherical particle should continue to be called Lorenz-Mie theory, I am working on a translation of Lorenz's pioneering article from 1890.
Unfortunately, I have only very little time to work on this project. In truth, I have not been able to find time to work on it since 2011. Since progress is slow, I want to make the translation available even though it is still unfinished. The original article is:
Lorenz, L. Lysbevægelser i og uden for en af plane Lysbølger belyst Kugle. Det kongelige danske Videnskabernes Selskabs Skrifter, 6. Række, Naturvidenskabelig og Mathematisk Afdeling VI, 1, pp. 2-62.
It is 61 pages. The translation follows the original page numbering. So far, I have translated 17 pages. There is still some way to go, but here is the partial translation:
Lorenz, L. Light propagation in and outside a sphere illuminated by plane waves of light. Det kongelige danske Videnskabernes Selskabs Skrifter, 6. Række, Naturvidenskabelig og Mathematisk Afdeling VI, 1, pp. 2-62. Translated by Jeppe Revall Frisvad, pp. 2-19, 2011 (unfinished).
In an old Danish Biographical Encyclopedia, the following interesting paragraph about this article appears. Translated from Danish:
Lorenz's work on the Theory of Colour Dispersion (Videnskab. Selsk. Skrifter 6. R. II, 1883) is particularly important as it is the outset of his solution of the old famous rainbow problem. The outlines of the rainbow theory are given by Descartes and Newton, more completely by Airy, who explained the supernumerary arcs by light interference. But, while one had previously limited oneself significantly to determining the directions in which these arcs appear, Lorenz set himself the goal to determine the light intensity completely in all directions on the basis of the theory of light. To complete this task, Lorenz worked almost continuously for several years; the dissertation is available in Videnskab. Selsk. Skrifter 6. R. VI (1890).