Roman Berka
Dept. of Computer Science and Engineering
Czech Technical University
Karlovo nam. 13
121 35 Prague

Abstract

Our paper presents an optimization technique which

modulates the computation complexity of the animation in virtual

reality (VR). As this technique is based on approaches commonly used

in the domain of LOD, we call it LOmD (Level of motion Detail). We

extend the classical LOD mechanism based on geometry removal according

to observer's distance from a target object, velocity of the model, and

position of the model in the periphery of the visual field. The LOmD

technique is based on the idea that our visual system is not able to

recognize differences in the quality of motions produced by different

animation techniques (e.g. simple linear interpolation vs. physically

based simulation) under different visual conditions (e.g. distance or

eccentricity). Varying the motion detail we can balance the workload

of VR system in such a way that the only motions important for the

user's view are refined using more complex simulation whereas other

motions are linearly interpolated to quarantee the motion

continuity. In order to achieve automatic behavior of LOmD mechanism

we designed the visual acuity model based on visual perception which

links the viewing conditions to the appropriate level of motion

detail. The proposed method has been tested on implementation of a

simple VR model. The results are presented at the section 5 of

the paper.