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Create panel > Space Warps > Forces > Object Type rollout > Path Follow
Tab panels > Space Warps tab > Path Follow Space Warp
Tab panels > Particles tab > Path Follow Space Warp
Particles following a spiral path
The Path Follow space warp forces particles to follow a spline path.
To set up and use Path Follow:
Create a shape consisting of a single spline. (You can use shapes with multiple splines, but the software uses only one spline for the path.)
Create a particle system and set its parameters to emit particles over a range of frames.
On the Create panel, click Path Follow, and drag in a viewport to create the Path Follow icon (a cube with wavy lines). The display and position of this icon don't affect the particles.
On the Basic Parameters rollout, click Pick Shape Object and select the spline you created earlier.
Bind the Path Follow icon to the particle system.
Adjust the Path Follow parameters to create the particle movement you want.
Note: You can further animate the particle effect by animating the spline vertices.
Tip: To adjust the position of the path or particle system while maintaining access to the Path Follow parameters, turn on Modifier Stack rollout > Pin Stack while the Path Follow space warp is selected.
If the particles don't follow the emitter after it's moved, then change any PathFollow parameter, and the motion will be corrected.
Lets you choose the path for the particles, and specify the range of influence of the Space Warp.
Object—Displays the name of the currently assigned path.
Pick Shape Object—Click this, and then click a shape in the scene to select it as a path. You can use any shape object as a path; if you select a multiple-spline shape, only one the lowest-number spline is used. You can also use NURBS curves as paths.
Unlimited Range—When off, the range of influence of the space warp is limited to the value set in the Distance spinner. When on, the space warp influences all bound particles in the scene, regardless of their distance from the path object.
Range—Specifies the range of influence when Unlimited Range is off. This is the distance between the path object and the particle system. The position of the Path Follow space warp's icon is ignored.
These controls affect how long particles are influenced by Path Follow.
Start Frame—The frame at which Path Follow begins to influence the particles.
Travel Time—The time each particle takes to traverse the path.
Variation—The amount by which each particle's travel time can vary.
Last Frame—The frame at which Path Follow releases the particles and no longer influences them.
The controls in this area determine the motion of particles.
Along Offset Splines—The distance between the particle system and the path alter the effect of the particle motion. If the first vertex of the spline is at the birthplace of the particle, the particle follows the spline path. If you move the path away from the particle system, the particles are affected by the offset.
Along Parallel Splines—Particles follow a copy of the selected path, parallel to the particle system. In this mode, the position of the path relative to the particle system does not matter. The orientation of the path, however, affects the particle stream.
Constant Speed—When on, all particles travel at the same speed.
Stream Taper—Causes particles to converge or diverge toward the path over time, or to simultaneously converge and diverge. You specify the effect by choosing Converge, Diverge, or Both (see following). This provides a tapering effect over the length of the path.
Variation—The amount by which Stream Taper can vary for each particle.
Converge—When Stream Taper is greater than 0, the particles move in toward the path as they follow the path. The effect is that the stream tapers from larger to smaller over time.
Diverge—Provides the opposite effect of Converge. The particles diverge from the path over time.
Both—Splits the particle stream, causing some particles to converge and others to diverge.
Stream Swirl—Specifies the number of turns by which particles spiral about the path. In conjunction with Stream Taper, alters the diameter of the spiral.
Stream Swirl is generally more effective when you choose Along Offset Splines.
Variation—The amount by which each particle can vary from the Spiral value.
Clockwise—Particles spiral in a clockwise direction.
Counterclockwise—Particles spiral in a counterclockwise direction.
Bidirectional—The stream is split so that particles spiral in both directions.
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