December 2013
Intermediate to advanced
508 pages
16h 50m
English
Content preview from Practical Algorithms for 3D Computer Graphics, 2nd Edition
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6.7. Particle modeling 257
Particles behave as if in frame of
reference of particle system
In the local
frame of reference
this is the ‘down’
direction; gravity
acts in this direction
After creation the particles behave
as if they were moving in a global
frame of reference
Global
down
direction
Local
down
direction
Particles ejected in this direction
in both cases
(c)
(a)
(d)
(b)
Figure 6.40: Top: A particle emitter at the center of the frame is moving from left to
right. In (a) the particles remain in the local frame of reference. In (b) the particles
are emitted in the local fr a me of reference but complete their life by moving in a global
frame of reference. (c) ...
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