Advances in network technology and research in real-time packet-switched networks have prompted the emergence of internet conferencing. While audio and video conferencing tools are readily available, shared workspaces and drawing tools have been slower to emerge. We present a design for a network conferencing whiteboard that differs in notable respects from other shared workspace prototypes. We...

This text gives a short overview of the features of the visualization software CLUCalc, and how this software may be used to teach various aspects of Geometric Algebra. CLUCalc is a stand-alone software tool that uses the 3d-graphics library OpenGL to visualize the geometric meaning of elements of Geometric Algebras. These visualizations can very easily be animated or made user-interactive. Apa...

Believable 3D animation of walking or running characters still requires complex motion capture technology or extensive skills in manual keyframing. We present an inexpensive, yet natural input method: The user “walks” on a digital graphics tablet, striding over the surface with two pens in his or her hands, where each pen represents one leg. This technique leverages the popular graphics tablets...

The design of graphics Ie's for the consumer market has performance limi­ tations imposed by the need to maintain low cost, and must be driven by con­ sideration of the potential applications. The likely requirements for a consumer aimed real time 3D graphics system are stated in terms of performance and rendering techniques, and a research prototype of a 3D display processor is presented. The ...

SUMMARY We present a suite of Unix shell programs for processing any number of phylogenetic trees of any size. They perform frequently-used tree operations without requiring user interaction. They also allow tree drawing as scalable vector graphics (SVG), suitable for high-quality presentations and further editing, and as ASCII graphics for command-line inspection. As an example we include an i...

Images rendered with traditional computer graphics techniques, such as scanline rendering and ray tracing, appear focused at all depths. However, there are advantages to having blur, such as adding realism to a scene or drawing attention to a particular place in a scene. In this paper we describe the optics underlying camera models that have been used in computer graphics, and present object sp...

Triangle meshes are the most popular standard model used to represent polygonal surfaces. Drawing these meshes as a set of independent triangles involves sending a vast amount of information to the graphics system. Taking advantage of the connectivity information between the triangles in a mesh dramatically diminishes the amount of information the graphics system must handle. Multiresolution Tr...

The qtpaint package supports interactive graphics in R through low-level interaction with the Qt toolkit. It is meant for experienced R users, who are familiar with GUI and graphics programming. It is expected that a number of packages will wrap qtpaint to provide a more convenient and user-friendly interface for the most common tasks. The interface provided by qtpaint is intentionally barebone...