We want a flat surface instead for this scene, so in the
Properties panel for the collision object, choose Plane from the Type drop-down.
Take a look at Figure 13.23 and you??™ll see that this creates a collision plane is
floating above the Y-axis. This is because the Radius/Level setting for it is set to
1m. Changing the Radius/Level setting is similar to changing the radius of the
particle emitter, as you did earlier in the chapter. Set this option to 500mm.
Setting Type to Plane is good for particles hitting a floor or a wall, and so on,
rather than a box or sphere. If you had, say, a building, or a car, you could set
Type to Object.
Remember, this is as basic as it gets, but the collisions work the same no matter
what particle scene you??™re setting up. The difference here is that you??™re only working
with effectors and emitters. You can make any object a collision, and place
your particle emitter into any object. Be sure to view the VisualParticle.mov movie
file (available as a free download from www.3dgarage.com) to see this in action.
Figure 13.23 New collision planes have a default Radius/Level setting of 1m.
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