Graphics Programs Reference
In-Depth Information
13.4.2 The Velocity Tab
The “Velocity” tab settings control how fast and in
what direction particles are emitted from a mesh ob-
ject (Figure 13.25).
•
Emitter Geometry
- Normal. Velocity of the particles normal
(at 90 degrees) to the emitting surface.
- Tangent. Velocity of the particles paral-
lel to the surface.
- Rotation. The value rotates the direction of the surface tangent.
•
Emitter Object
-
Figure 13.25
The velocity of particles along the
x
,
y
, and
z
axes in the scene.
Note:
All values may be entered as positive or negative, which reverses the direction.
•
Other
-
Object. The object gives the particles a starting speed and direction.
-
Random. Gives the starting speed direction a random variation.
Note:
The “Other” values are best demonstrated with particles being displayed as ob-
jects. See also the “Render” tab.
13.4.3 Physics
Physics determine the way particles move and interact with the world around them. Note the
selection bar at the top of the “Physics” tab with “Newtonian” highlighted in blue (Figure 13.26).
“Newtonian” is the normal particle
physics that we will consider at this
time. The other options are:
•
No.
Particles stick to their
emitter for the whole lifetime.
•
Keyed.
Allows particles to be
directed from one emitter to
another, setting up a chain of
particles moving from one
place to the other.
Figure 13.26
