Micheal McKenna, Steve Pieper, and David Zeltzer. Control of a virtual actor: The roach. In ACM Symposium on Interactive 3D Graph- ics, pages 165-173, 1990.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....ity of all the bolds within a certain radius of the bold. Perception of environmental obstacles for collision avoidance is provided by an extra database of objects in the environment which uses simplified shapes. This is directly interrogated by the obstacle avoidance behaviour. McKenna et al. [6] produced an animated cockroach which detected a grabbing hand and other objects in the environment by interrogating input devices and the graphical database. Tu and Terzopoulos [15] pro duced animated models of fish. They detect any object that is not fully occluded by another object and that ....

Micheal McKenna, Steve Pieper, and David Zeltzer. Control of a virtual actor: The roach. In ACM Symposium on Interactive 3D Graph- ics, pages 165-173, 1990.

....Multiple recording daemons may be active simultaneously so as to record the variations of all variables influenced by the manipulation. That way, Fig. 6: While recording, device sensor values are connected to tracks variables. it is possible to interact with the animated object at the task level [16], as the 3D motion described by the 3D cursor can be interpreted as a high level goal allowing the simultaneous and coordinated control of several parameters as, for example, when guiding a walking articulated figure. Since interaction constraints have a higher priority than the binding ....

McKenna M, Pieper S, Zeltv. er D (1990) Control of a Virtual Actor: The Roach. Proc. SICGRAPH Symp. on Interactive 3D Graphics: 165-174.

....in real time, and space efficient because a relatively compact description of the world can be used to generate animation of arbitrarily long duration. The computer graphics literature contains techniques for dynamically simulating a wide range of phenomena, including humans [14, 43] creatures [57, 59, 86], fluids [27, 28, 48, 70, 79, 92] rigid and deformable bodies [4, 62, 85, 97] and recently fractures [71] and explosions [68] In principle, anything that can be described by a solvable system of equations or a set of rules can be simulated. In practice, however, two major technological problems ....

Michael McKenna, Steve Pieper, and David Zeltzer. Control of a virtual actor: The roach. In ACM SIGGRAPH

.... Bruderlin and Calvert implemented a restricted dynamic simulation optimized especially for bipedal locomotion, combined with gait controllers with explicit knowledge of the mechanisms of walking (Bruderlin and Calvert, 1989) McKenna and Zeltzer simulated locomotion of multilegged creatures (McKenna et al. 1990; McKenna and Zeltzer, 1990) They combined a physical simulation of six legged insects with a gait controller which would use oscillators, steered by feedback from leg angle and step sensors, to drive the torques at joints, producing locomotion. Raibert and Hodgins constructed dynamic locomotion ....

.... implemented a restricted dynamic simulation optimized especially for bipedal locomotion, combined with gait controllers with explicit knowledge of the mechanisms of walking (Bruderlin and Calvert, 1989) McKenna and Zeltzer simulated locomotion of multilegged creatures (McKenna et al. 1990; McKenna and Zeltzer, 1990). They combined a physical simulation of six legged insects with a gait controller which would use oscillators, steered by feedback from leg angle and step sensors, to drive the torques at joints, producing locomotion. Raibert and Hodgins constructed dynamic locomotion simulations where the ....

McKenna, M., Pieper, S., and Zeltzer, D. (1990). Control of a virtual actor: The roach. In Riesenfeld, R. and Sequin, C., editors, Computer Graphics (1990 Symposium on Interactive 3D Graphics), volume 24, pages 165--174.

....For some objects this is trivial, a rolling sphere has a very simple model controlling its motion. A more complicated problem is that of simulating the motion of jointed figures. McKenna and Zeltzer present a system for modelling the dynamics of motion of a roach within a virtual environment [MPZ90, MZ90] The roach moves around with a natural gait pattern and it can respond to basic interactions such as come here messages. The gait is modelled using oscillators and reactions to the environment such as over extension of a leg which causes the leg to move immediately. More complex behaviours ....

Michael McKenna, Steve Pieper, and David Zeltzer. Control of a virtual actor: The roach. Computer Graphics, 24(2):29--37, March 1990.

....of these approaches to general purpose animation systems running on graphics workstations. Instead of relying on advanced motion capture devices, we exploit our fully 3D user interface to control the animated environment at a higher level of abstraction. The guiding approach proposed in [23] also seeks to provide better control of synthetic objects by raising the abstraction level of user interaction. That work concentrates on modeling complex behaviors in a discrete simulation framework, while we focus on providing intuitive user interfaces. A major limitation of current performance ....

McKenna M, Pieper S, Zeltzer D (1990) Control of a Virtual Actor: The Roach. Proc. SIGGRAPH Symposium on Interactive 3D Graphics : 165-174.

....manipulation. That way, MODEL info CONTROLLER info = active controller CONNECTOR = model time = TRACK value time Sketch Demon Constraint Network Fig. 6: While recording, device sensor values are connected to tracks variables. it is possible to interact with the animated object at the task level [16], as the 3D motion described by the 3D cursor can be interpreted as a high level goal allowing the simultaneous and coordinated control of several parameters as, for example, when guiding a walking articulated figure. Since interaction constraints have a higher priority than the binding ....

McKenna M, Pieper S, Zeltzer D (1990) Control of a Virtual Actor: The Roach. Proc. SIGGRAPH Symp. on Interactive 3D Graphics: 165-174.

....has been substantially concerned with solving this problem. Animating the structure and behavior of physical worlds is also an active research area directly relevant to VR. Work on physically based modeling for animation, such as that reported in (Badler et al. 1990; Witkin and Welch, 1990; McKenna et al. 1990) and elsewhere, may make it much easier to portray and simulate familiar physical worlds, including the physical bodies and low level behaviors of agents. Yet looking at what makes traditional media so powerful for viewers, and thus what may make virtual reality a genuinely powerful and popular ....

McKenna, J., Pieper, S., and Zelter, D. (1990). Control of a virtual actor: The roach. In Proceedings of the 1990 Symposium on Interactive 3D Graphics, Snowbird, Utah.

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McKenna M, Pieper S, Zeltzer D (1990) Control of a Virtual Actor: The Roach. Proc. SIGGRAPH Symposium on Interactive 3D Graphics: 165-174.

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McKenna, M., Pieper, S. and Zeltzer D. "Control of a Virtual Actor: The Roach," Computer Graphics; Proceedings of 1990 Symposium on Interactive 3-D Graphics, Vol. 24, No. 2, March 1990, pg. 165-174.

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McKenna Michael, Pieper Steve, Zeltzer David, 1990. Control of a Virtual Actor: The Roach. ACM Press, March 1990, volume 24, pp 165-174.

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