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118 Chapter 11: Space Warps and Particle Systems
much greater control over how space warps affect
the part icles than with prev ious systems.
How do I make particles follow a path?
Yo u c a n u s e t h e
Speed By Icon operator (page
2–158)
or the Find Target test (page 2–214) ,
assigning the icon or target to a spline path. You’ll
find i llustrative procedures in both topics.
Can I use Snapshot or dynamics with Particle
Flow?
No. The Snapshot tool is not currently compatible
with Particle Flow, nor is rea ctor or the legacy
dynamics system.
How do I use motion blur with Pa rticle Flow?
Youcanapplymotionbluronaper-eventbasisby
editing the event’s
object properties (page 1–111)
w ith the right-click menu in Part icle View, or on
a global basis by editing the global event’s object
properties. In the Part icle View dialog, hig h light
the event to edit and then right-click and choose
Properties. On the Object Properties dialog, edit
the Motion Blur group settings.
Alternatively, you can apply motion blur to an
entire Particle Flow system without the need to set
properties by using the
multi-pass motion blur
effect (page 2–1230)
w ith a camera.
Note: Yo u c a n a l s o u s e O b j e c t P r o p e r t i e s t o s e t
other properties for events and the particle system,
as with any object in 3ds Max. Do this
only within
Particle View
, not using the source icon in the
view por ts (ri ght-click menu > Propert ies or Edit
menu > Object Properties).
Note: When using Object Motion Blur, if an event
contains a Material Dynamic operator that uses
a material with a Particle Age, Particle MBlur, or
Bitmap map, the event should not also contain a
Deleteoperator,oraSpawnorCollisionSpawn
test. Also, the event should not contain any
tests that are wired to another event. The only
exceptiontothisistheAgeTestoperatorwhen
settoAbsoluteTimewithoutanyvariation;that
is, all particles leave the event at the same time.
This applies to the use of Object Motion Blur only;
there are no restrictions with Image Motion Blur.
How do I use the Particle Age a nd Particle M Blur
maps with Par ticle Flow?
To u s e t h e Pa r t i c l e Age m a p w i t h Par t i c l e F l ow, you
must use the Delete operator to give the particles a
finite life span. For further information, see
Delete
Operator (page 2–142)
.
Also note the following:
• Part icle Age, Particle MBlur and a Bitmap map
containing an animated bitmap can b e used
only with
Material Dynamic operator (page
2–187)
, with Same As Particle ID tur ned on.
You’ll find procedures for using Bitmap and
Particle Age at this topic.
• The particle material cannot be a submaterial;
it must be the main material.
• In the non-event-dr iven par ticle systems in
3ds Max, Particle M Blur is used with a control
named Direction Of Travel\MBlur and an
accompanying Stretch parameter. In Particle
Flow, you c an replicate the stretching effect by
using a Sca le operator, turning off Sca le Factor
> Constrain Properties, and scaling the particle
along one axis.
I’m tr yin g to apply Particle Flow to an anim ation
created with a dynamics system. Why am I
getting strange results such as unexpected
spawning of particles?
The dynamics system probably gener ates rotation
keys using the Euler XYZ controller. To avoid
interpolation discontinuities, change the rotation
controller for such objects to TCB Rotation.