Reflectance Transfer for Material Editing and Relighting

We present a new approach to diffuse reflectance estimation for dynamic scenes. Non-parametric image statistics are used to transfer reflectance properties from a static example set to a dynamic image sequence. The approach allows diffuse reflectance estimation for surface materials with inhomogeneous appearance, such as those which commonly occur with patterned or textured clothing. Material editing is also possible by transferring edited reflectance properties. Material reflectance properties are initially estimated from static images of the subject under multiple directional illuminations using photometric stereo. The estimated reflectance together with the corresponding image under uniform ambient illumination form a prior set of reference material observations. Material reflectance properties are then estimated for video sequences of a moving person captured under uniform ambient illumination by matching the observed local image statistics to the reference observations. Results demonstrate that the transfer of reflectance properties enables estimation of the dynamic surface normals and subsequent relighting combined with material editing. This approach overcomes limitations of previous work on material transfer and relighting of dynamic scenes which was limited to surfaces with regions of homogeneous reflectance. We evaluate our approach for relighting 3D model sequences reconstructed from multiple view video. Comparison to previous model relighting demonstrates improved reproduction of detailed texture and shape dynamics.

Construction interactive de BRDFs par simulation 2D de micro-géométries en couches multiples

Les modèles de réflexion complexes, avec leurs nombreux paramètres dont certains restent non intuitifs, sont difficiles à contrôler pour obtenir une apparence désirée. De plus, même si un artiste peut plus aisément comprendre la forme de la micro-géométrie d'une surface, sa modélisation en 3D et sa simulation en 4D demeurent extrêmement fastidieuses et coûteuses en mémoire. Nous proposons une solution intermédiaire, où l'artiste représente en 2D une coupe dans un matériau, en dessinant une micro-géométrie de surface en multi-couches. Une simulation efficace par lancer de rayons en seulement 2D capture les distributions de lumière affectées par les micro-géométries. La déviation hors-plan est calculée automatiquement de façon probabiliste en fonction de la normale au point d'intersection et de la direction du rayon incident. Il en résulte des BRDFs isotropes complètes et complexes, simulées à des vitesses interactives, et permettant ainsi une édition interactive de l'apparence de réflectances riches et variées.

History of grazing; a circular offering suggestions on a technique for compiling data, writing, and editing material for a history of grazing.

Mimeographed.

The effect of electrode material on the electrochemical formation of porous copper surfaces using hydrogen bubble templating

The electrodeposition of copper onto copper, gold, palladium and glassy carbon (GC) electrodes via a hydrogen bubble templating method is reported. It is found that the composition of the underlying electrode material significantly influences the morphology of the copper electrodeposit. Highly ordered porous structures are achieved with Cu and Au electrodes, however on Pd this order is disrupted and a rough randomly oriented surface is formed whereas on GC a bubble templating effect is not observed. Chronopotentiograms recorded during the electrodeposition process allows bubble formation and detachment from the surface to be monitored where distinctly different potential versus time profiles are observed at the different electrodes. The porous Cu surfaces are characterised with scanning electron microscopy, X-ray diffraction and cyclic voltammetric measurements recorded under alkaline conditions. The latter demonstrates that there are active sites present on electrodeposited copper whose coverage and reactivity depend on the underlying electrode material. The most active Cu surface is achieved at a Pd substrate for both the hydrogen evolution reaction and the catalytic reduction of ferricyanide ions with thiosulphate ions. This demonstrates that the highly ordered porous structure on the micron scale which typifies the morphology that can be achieved with the hydrogen bubbling template method is not required in producing the most effective material.

Numerical modelling and analysis of the blast performance of laminated glass panels and the influence of material parameters

This paper presents a comprehensive numerical procedure to treat the blast response of laminated glass (LG) panels and studies the influence of important material parameters. Post-crack behaviour of the LG panel and the contribution of the interlayer towards blast resistance are treated. Modelling techniques are validated by comparing with existing experimental results. Findings indicate that the tensile strength of glass considerably influences the blast response of LG panels while the interlayer material properties have a major impact on the response under higher blast loads. Initially, glass panes absorb most of the blast energy, but after the glass breaks, interlayer deforms further and absorbs most of the blast energy. LG panels should be designed to fail by tearing of the interlayer rather than failure at the supports to achieve a desired level of protection. From this aspect, material properties of glass, interlayer and sealant joints play important roles, but unfortunately they are not accounted for in the current design standards. The new information generated in this paper will enhance the capabilities of engineers to better design LG panels under blast loads and use better materials to improve the blast response of LG panels.

Parallel editing, multi-positionality and maximalism: cosmopolitan effects as explored in some art works by Melanie Jackson and Vivienne Dick

Garfield produces a critique of neo-minimalist art practice by demonstrating how the artist Melanie Jackson’s Some things you are not allowed to send around the world (2003 and 2006) and the experimental film-maker Vivienne Dick’s Liberty’s booty (1980) – neither of which can be said to be about feeling ‘at home’ in the world, be it as a resident or as a nomad – examine global humanity through multi-positionality, excess and contingency, and thereby begin to articulate a new cosmopolitan relationship with the local – or, rather, with many different localities – in one and the same maximalist sweep of the work. ‘Maximalism’ in Garfield’s coinage signifies an excessive overloading (through editing, collage, and the sheer density of the range of the material) that enables the viewer to insert themselves into the narrative of the work. In the art of both Jackson and Dick Garfield detects a refusal to know or to judge the world; instead, there is an attempt to incorporate the complexities of its full range into the singular vision of the work, challenging the viewer to identify what is at stake.

Editar en el Novecientos (Orsini Bertani y algunos problemas de las culturas material y simbólica)

Editor del Novecientos uruguayo pero, también, pionero en la edición del teatro argentino, el italiano Orsini M. Bertani realizó una labor cultural clave para las minorías de su tiempo (que no siempre lo respaldaron) y, sobre todo, para el futuro. En el sello editorial que llevó su nombre publicó básicamente a los contemporáneos del modernismo naciente (Julio Herrera y Reissig, Delmira Agustini) y del realismo criollo o urbano (Florencio Sánchez, Javier de Viana, tal vez las primeras piezas de Armando Discépolo), cerrando su carrera con el impulso de la revista La Pluma (1927-1931). Este artículo revisa su proyecto y sus líneas en el marco de los esfuerzos contemporáneos del Río de la Plata

Editar en el Novecientos (Orsini Bertani y algunos problemas de las culturas material y simbólica)

Editor del Novecientos uruguayo pero, también, pionero en la edición del teatro argentino, el italiano Orsini M. Bertani realizó una labor cultural clave para las minorías de su tiempo (que no siempre lo respaldaron) y, sobre todo, para el futuro. En el sello editorial que llevó su nombre publicó básicamente a los contemporáneos del modernismo naciente (Julio Herrera y Reissig, Delmira Agustini) y del realismo criollo o urbano (Florencio Sánchez, Javier de Viana, tal vez las primeras piezas de Armando Discépolo), cerrando su carrera con el impulso de la revista La Pluma (1927-1931). Este artículo revisa su proyecto y sus líneas en el marco de los esfuerzos contemporáneos del Río de la Plata

Editar en el Novecientos (Orsini Bertani y algunos problemas de las culturas material y simbólica)

Editor del Novecientos uruguayo pero, también, pionero en la edición del teatro argentino, el italiano Orsini M. Bertani realizó una labor cultural clave para las minorías de su tiempo (que no siempre lo respaldaron) y, sobre todo, para el futuro. En el sello editorial que llevó su nombre publicó básicamente a los contemporáneos del modernismo naciente (Julio Herrera y Reissig, Delmira Agustini) y del realismo criollo o urbano (Florencio Sánchez, Javier de Viana, tal vez las primeras piezas de Armando Discépolo), cerrando su carrera con el impulso de la revista La Pluma (1927-1931). Este artículo revisa su proyecto y sus líneas en el marco de los esfuerzos contemporáneos del Río de la Plata