Page 1075 - Kitab3DsMax

Chapter 42: Using Space Warps
Vortex
You can use the Vortex Space Warp on particle systems to make particles spin around in a spiral like going
down a whirlpool. You can use the Timing settings to set the beginning and ending frames where the effect
takes place.
You can also specify Taper Length and Taper values, which determine the shape of the vortex. Lower Taper
Length values wind the vortex tighter, and the Taper Curve values can range between 1.0 and 4.0 and con-
trol the ratio between the spiral diameter at the top of the vortex versus the bottom of the vortex.
The Axial Drop value specifies how far each turn of the spiral is from the adjacent turn. The Damping value
sets how quickly the Axial Drop value takes effect. The Orbital Speed is how fast the particles rotate away
from the center. The Radial Pull value is the distance from the center of each spiral path that the particles
can rotate. If the Unlimited Range option is disabled, then Range and Falloff values are included for each
setting. You can also specify whether the vortex spins clockwise or counterclockwise.
Figure 42.4 shows a Vortex Space Warp being bound to a particle system.
FIGURE 42.4
You can use the Vortex Space Warp to force a particle system into a spiral like a whirlpool.

Drag
Drag is another common force that can be simulated with a Space Warp. The Drag Space Warp can be
Linear, Spherical, or Cylindrical. This Space Warp causes particle velocity to be decreased, such as when
simulating air resistance or fluid viscosity. Use the Time On and Time Off options to set the frame where
the Space Warp is in effect.

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