Animation of Water Droplets on a Glass Plate
Kazufumi Kaneda, Takushi Kagawa, Hideo Yamashita
Proc. Computer Animation '93, pp. 177-189 (1993)
ABSTRACT
This paper proposes a method for generating an animation of water droplets
and their streams on a glass plate, such as a windowpane or windshield,
taking into account the dynamics between fluid and solid.
Water droplets run down an inclined glass plate
if their masses are greater than a static critical weight.
The streams from the droplets do not run straight down the glass plate
but meander and some amount of water remains behind the flow
due to the nature of the wetting phenomenon.
Therefore, the mass of the water droplet decreases.
When the mass becomes smaller than a dynamic critical weight, the flow stops.
In this paper, a discrete model of a glass plate is developed
to simulate the streams from the water droplets as described above.
The glass plate is divided into small meshes.
For rendering scenes through a glass plate upon which there are water droplets,
we also develop a high-speed rendering method
taking into account reflection and refraction of light.
Instead of calculating the intersections between the ray and the objects,
one of the most time-consuming processes in ray tracing,
the proposed method determines pixel colors by using the intersection
between the ray and a cuboid onto which objects in a scene are projected.
Animations of rain droplets on a pane or windshield demonstrate
the usefulness of the proposed method.
Keywords: Water Droplet, Flow, Discrete Model, Dynamics, Interfacial Tension
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Figure 8: Flow of water droplets.
Figure 9: Flow of water droplets.
Figure 10: Flow of water droplets.
Figure 11: Animation of water droplets.
Figure 12: Animation of water droplets.
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