Animating bird flight using aerodynamics

Ramakrishnananda, Balajee; Wong, Kok Cheong

doi:10.1007/s003710050195

Cited by 14 publications

(3 citation statements)

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“…We plan to address these issues in the near future. Another interesting area of future work is bird animation [16]. The flocking of birds has been explored by Reynolds [17].…”

Section: Discussionmentioning

confidence: 99%

Modeling and rendering of realistic feathers

Chen

Guo

et al. 2002

Proceedings of the 29th Annual Conference on Computer Graphics and Interactive Techniques

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We present techniques for realistic modeling and rendering of feathers and birds. Our approach is motivated by the observation that a feather is a branching structure that can be described by an Lsystem. The parametric L-system we derived allows the user to easily create feathers of different types and shapes by changing a few parameters. The randomness in feather geometry is also incorporated into this L-system. To render a feather realistically, we have derived an efficient form of the bidirectional texture function (BTF), which describes the small but visible geometry details on the feather blade. A rendering algorithm combining the L-system and the BTF displays feathers photorealistically while capitalizing on graphics hardware for efficiency. Based on this framework of feather modeling and rendering, we developed a system that can automatically generate appropriate feathers to cover different parts of a bird's body from a few "key feathers" supplied by the user, and produce realistic renderings of the bird.

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“…We plan to address these issues in the near future. Another interesting area of future work is bird animation [16]. The flocking of birds has been explored by Reynolds [17].…”

Section: Discussionmentioning

confidence: 99%

Modeling and rendering of realistic feathers

Chen

Guo

et al. 2002

Proceedings of the 29th Annual Conference on Computer Graphics and Interactive Techniques

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“…Reynolds [1987] modeled the group behavior of birds by modeling flocks as particle systems. Ramakrishnananda and Wong [1999] utilized simplified aerodynamics and manually tuned controllers for bird flight animation. They used forward kinematics in their simulation, omitted the elbow joints, and simplified the joint movements for the wrists.…”

Section: Related Workmentioning

confidence: 99%

Realistic modeling of bird flight animations

WuJia-chi

PopovićZoran

2003

ACM Trans. Graph.

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Figure 1: An animation sequence of a raven's wingbeat motion during takeoff. AbstractIn this paper we describe a physics-based method for synthesis of bird flight animations. Our method computes a realistic set of wingbeats that enables a bird to follow the specified trajectory. We model the bird as an articulated skeleton with elastically deformable feathers. The bird motion is created by applying joint torques and aerodynamic forces over time in a forward dynamics simulation. We solve for each wingbeat motion separately by optimizing for wingbeat parameters that create the most natural motion. The final animation is constructed by concatenating a series of optimal wingbeats. This detailed bird flight model enables us to produce flight motions of different birds performing a variety of maneuvers including taking off, cruising, rapidly descending, turning, and landing.

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“…In the flapping-driven simulation, there is a cause-and-effect relationship between the wingbeats and the bird's flight, and hence, natural flapping can be simulated. Ramakrishnananda et al [2] proposed a model for the flight of large birds in which the bird is propelled by the force of wingbeats and moves up and down toward its target points. It has been shown that it is possible to express the motion of the bird naturally by using the force of wingbeats to move the bird.…”

Section: Introductionmentioning

confidence: 99%