g-BRDFs: An Intuitive and Editable BTF Representation
| dc.contributor.author | Menzel, N. | en_US |
| dc.contributor.author | Guthe, M. | en_US |
| dc.date.accessioned | 2015-02-23T09:30:06Z | |
| dc.date.available | 2015-02-23T09:30:06Z | |
| dc.date.issued | 2009 | en_US |
| dc.description.abstract | Measured reflection data such as the bidirectional texture function (BTF) represent spatial variation under the full hemisphere of view and light directions and offer a very realistic visual appearance. Despite its high-dimensional nature, recent compression techniques allow rendering of BTFs in real time. Nevertheless, a still unsolved problem is that there is no representation suited for real-time rendering that can be used by designers to modify the BTF s appearance. For intuitive editing, a set of low-dimensional comprehensible parameters, stored as scalars, colour values or texture maps, is required. In this paper we present a novel way to represent BTF data by introducing the geometric BRDF (g-BRDF), which describes both the underlying meso- and micro-scale structure in a very compact way. Both are stored in texture maps with only a few additional scalar parameters that can all be modified at runtime and thus give the designer full control over the material s appearance in the final real-time application. The g-BRDF does not only allow intuitive editing, but also reduces the measured data into a small set of textures, yielding a very effective compression method. In contrast to common material representation combining heightfields and BRDFs, our g-BRDF is physically based and derived from direct measurement, thus representing real-world surface appearance. In addition, we propose an algorithm for fully automatic decomposition of a given measured BTF into the g-BRDF representation. | en_US |
| dc.description.number | 8 | en_US |
| dc.description.seriesinformation | Computer Graphics Forum | en_US |
| dc.description.volume | 28 | en_US |
| dc.identifier.doi | 10.1111/j.1467-8659.2009.01432.x | en_US |
| dc.identifier.issn | 1467-8659 | en_US |
| dc.identifier.pages | 2189-2200 | en_US |
| dc.identifier.uri | https://doi.org/10.1111/j.1467-8659.2009.01432.x | en_US |
| dc.publisher | The Eurographics Association and Blackwell Publishing Ltd | en_US |
| dc.title | g-BRDFs: An Intuitive and Editable BTF Representation | en_US |