Game Development Reference
In-Depth Information
Range value to adjust the initial speed for a particle, plus or minus half of the value of the
Range value. Setting the Range value to 0 means that all particles travel at the same
speed.
The Acceleration Property
The final particle movement property is the Acceleration property. The Acceleration prop-
erty controls the degree to which a particle accelerates or decelerates after emission in
terms of both X and Y directions. You use the X value to apply acceleration along the x-
axis, and you use the Y value to apply acceleration along the y-axis.
It is common to use the Acceleration property to simulate a gravity effect. The easiest way
to see how this works is to change all the emitter properties so that they match the values
in
Figure 6-8
.
