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Published in Phillip A. Laplante, Dictionary of Computer Science, Engineering, and Technology, 2017
particle system a technique for modeling irregular natural structures by a collection of independent objects, often represented as single points. Objects that have been represented using this technique include fire, smoke, clouds, fog, explosions, grass, etc. Each particle will have its own motion and property parameters, usually drawn randomly from a distribution (perhaps constrained by or linked to other particles, or other scene objects, such as grass being constrained to grow from a specified surface). Because natural effects based on particle systems need many particles for realistic appearance, rendering of particle systems often requires special-purpose methods that exploit the properties of the particular particle system.
Remediating tradition with technology: a case study of From Tangible to Intangible: A Media Showcase of Kisa chin p’yori chinch’an uigwe
Published in Digital Creativity, 2021
Boa Rhee, Federico Pianzola, Nayea Oh, Gangta Choi, Jungho Kim
Starting with this idea, our team was inspired by the hybrid data visualization in Visual Genealogy (Park, Lee, and Park 2016). Thus, we decided to create a visual effect using a particle system to express the colours of the 1809 Uigwe and the music of the ceremony. A particle system is a method for modelling objects with fuzzy shapes such as fire, clouds, and lights. The design of a particle system is not fixed, inasmuch as its shapes and forms are not completely specified. Thus, a particle system is not a static entity. Such dynamic visualizations have been used in various creative works (Fonteles, Rodrigues, and Basso 2013). We selected 10 musical instruments used by the deungga and heonga orchestras to be displayed in a carousel3 to which we applied the particle system effect: Eo, Gayageum, Haegeum, Janggo, Pyeon-gyeong, Geongo, Gyobamggo, Bipa, Saenghwang, and Bak (Figure 2). Since the media showcase was planned to be in the UK, in selecting the instruments we also considered foreign audience’s possible knowledge of a popular show such as Samulnori – a kind of Korean folk music performed with percussions – and of Gayageum, a zither-like string instrument.
A method of using image-view pairs to represent complex 3D objects
Published in Cogent Engineering, 2018
Lihong Luo, Jianqing Mo, Xian Yang
The techniques mentioned above are referred to as “vertex set methods based on geometric structures.” However, there are other techniques for computer-based simulation of complex objects and shapes, which we will refer to as “features-based methods.” The strength of these methods is their use of simple shapes and images to represent the main features of a complex object, instead of attempting to obtain an accurate drawing of the object. For example, the billboard (Behrendt, Colditz, Franzke, Kopf, & Deussen, 2005) method uses two vertical surfaces along with image textures to represent trees. Fractal technology acquires plant branches using fractal iterations to simulate plants (Magdics, 2009). The particle system simulates natural phenomena such as flames, fountain, and storms by generating, moving, and deleting particles (Du, Li, & Wang, 2014). We also often use half spheres and boxes to simulate sky and clouds, sine functions to simulate waves in the sea, and dynamic surfaces and textures to simulate water splashes (Liao & Jinhui, 2011). These methods extract the main relevant features (physical or visual) and represent them using methods that are not based on vertex sets or shape structures. This strategy is more efficient for many types of objects.