Printed in Great Britain. GLOBULAR DYNAMICS A CONNECTED PARTICLE SYSTEM FOR ANIMATING VISCO.pdf
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Printed in Great Britain. GLOBULAR DYNAMICS A CONNECTED PARTICLE SYSTEM FOR ANIMATING VISCO
Comput. Graphics Vol. 13, No. 3, pp. 305-309, 1989
Printed in Great Britain.
0097-8493/89 $3.00 + .00
? 1989 Pergamon Press plc
Computer Graphics in Canada
GLOBULAR DYNAMICS: A CONNECTED PARTICLE
SYSTEM FOR ANIMATING VISCOUS FLUIDS
GAVIN MILLER
Apple Computer, Inc., The Advanced Technology Group, 20525 Mariani Ave.,
M5:22Y, Cupertino, CA 95014
and
ANDREW PEARCE
Alias Research, Inc., 500-110 Richmond St., E., Toronto, Ontario, Canada M5C 1P1
Abstract— Connected particle systems can depict many objects difficult to model in any other fashion. We present a method for
animating viscous fluids by simulating the forces of such particles interacting with each other. This method allows for collision
detection between the particles and obstacles, both stationary and mobile, and it allows solid objects to break and melt. An
approximate method for covering the particles with an isosurface for efficient rendering is also presented.
1. INTRODUCTION
We are interested in modeling materials such as lava, mud, slime,
oil and salad dressing, as well as breakable, meltable solids.
Existing techniques which could be considered include bicubic
patches[1] and blobby molecules[2]. However, problems arise with
both methods. It is difficult to model amorphous shapes with bicubic
patches since they cannot be broken into arbitrary pieces. Blobby
molecules do model amorphous shapes but two problems arise:
1. Blobs need a dynamic model for animation which includes
collision detection and blob to blob interaction.
2. We wish, to render many blobs with limited memory, using
existing fast rendering hardware to produce animations quickly
and inexpensively.
Particle systems[3] provide a dynamic model for the trajectories
and collisions but do not take into account particle interaction. Soft
objects[4] apply some motion control to blobs but ignore collisions
between blobs. Recently, elastically deformable models[5] were
proposed which provide a technique for computing the shape
changes of continuous
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