Humans use shading as a cue to three-dimensional form by combining low-level information about light intensity with high-level knowledge about objects and the environment. Here, we examine how cuttlefish Sepia officinalis respond to light and shadow to shade the white square (WS) feature in their body pattern. Cuttlefish display the WS in the presence of pebble-like objects, and they can shade ...

Existing shape-from-shading algorithms assume constant reflectance across the shaded surface. Multi-colored surfaces are excluded because both shading and reflectance affect the measured image intensity. Given a standard RGB color image, we describe a method of eliminating the reflectance effects in order to calculate a shading field that depends only on the relative positions of the illuminant...

Light is the origin of vision. The pattern of shading reflected from object surfaces is one of several optical features that provide fundamental information about shape and surface orientation. To understand how surface and object shading is processed by birds, six pigeons were tested with differentially illuminated convex and concave curved surfaces in five experiments using a go/no-go procedu...

by having daylighting in mind through a building design process rather than end of it, achieving a more sustainable space is much easier and feasible. since many people spend an important amount of their lives at their working spaces, accessing enough natural light together with satisfying view are essential for their physiological and psychological health. moreover as a daylighted space has a ...

This article presents a survey of popular shading models used in 3D computer graphics. Each model is discussed on the basis of an hardware-accelerated implementation that runs on typical consumergrade graphics boards. The discussion is focused on interactive realtime applications, where – besides realism – computational costs, scalability, and easily tweakable parameters are important factors. ...

RE: Burden of anemia in patients with osteoarthritis and rheumatoid arthritis in French secondary care Following our recent correspondence concerning the above-titled manuscript recently submitted to BMC Geriatrics, please find below an outline of the changes we have now made to the manuscript: 1) Amended the authors' contributions so using only author initials instead of full name. Indicated t...

Procedural material shaders continue to pop up since the advent of fragment programmability. Most of these shaders concentrate on interesting animated effects. The cg shades demo successfully explores the use of fragment shader programming for a different kind of materials: Highly repetitive, man-made materials. The given code shows a variety of implementation options adapted to different usage...

Graphics hardware evolution in the past year has been highlighted by improved shading resources, the introduction of dynamic flow control and the emergence of multi-GPU system configurations. Executed program length increased substantially and register availability became more affordable. As a result, compiler support for segmenting a shading program to fit hardware constraints has diminished a...