A visualization of a vector-field by a homogenized nascent-particles tracking

Abstract

Particle tracking methods have been developed to visualize a vector-field. The methods are efficient to show a large-scale and a small-scale structure in the flow field clearly. However, initial positions of the particles sometimes affect a visualized pattern. In addition, when a particle lies on another one, it becomes difficult to display the particle and to recognize the pattern. In this paper, we consider an enhancement of particle tracking methods against those problems. First, we attempt to reduce the dependence of pattern on the initial position and consider how to display a particle occupies another particle position. Essence of our solution is composed of homogenizing nascent-particles and a certain manipulation in a pixel/voxel space. This solution is similar to that of line integral convolution method (LIC). Secondly, accuracy of the visualization process is discussed. Then, we make clear some pitfalls of LIC. Finally, a new technique to overcome drawbacks of conventional particle tracking methods and LIC is described. Several flow fields in two-dimensions and near surfaces are visualized for demonstration of our proposed method.