Push Space Warp
 
 
 
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Create panel (Space Warps) Forces Object Type rollout Push

Create menu Space Warps Forces Push

For particle systems, Push applies a uniform, unidirectional force. For dynamics systems, it provides a point force: like pushing something with your finger.

Push disperses a cloud of particles

The Push space warp applies a force to either particle systems or dynamics systems. The effect is different, depending on the system:

Procedures

To create a Push space warp:

  1. On the Create panel, click (Space Warps). Choose Forces from the list, then on the Object Type rollout, click Push.
  2. Drag in a viewport to define the size.

    The Push warp appears as a hydraulic jack icon.

Interface

Timing group

On Time/Off Time

The numbers of the frames in which the space warp begins and ends its effect. Because Push moves the particles to which it's applied over time, no keyframes are created.

Strength Control group

Basic Force

The amount of force exerted by the space warp.

Newtons/Pounds

This option specifies the units of force used by the Basic Force spinner.

A pound is about 4.5 Newtons, and one newton is one kilogram-per-second-squared. When Push is applied to particle systems, these values have only subjective meaning because they depend on the built-in weighting factors and time scaling used by the particle system. However, when used in a dynamics system, the value listed is precisely the value used.

Feedback On

When on, the force varies depending on the speed of the affected particles relative to the specified Target Speed. When off, the force remains constant, regardless of the speed of the affected particles.

Reversible

When on, if the particle's speed exceeds the Target Speed setting, the force is reversed. Available only if you turn on Feedback On.

Target Speed

Specifies the maximum speed in units per frame before the Feedback takes effect. Available only if you turn on Feedback On.

Gain

Specifies how quickly the force adjusts to approaching the target speed. If set to 100 percent, the correction is immediate. If set lower, a slower and "looser" response occurs. Available only if you turn on Feedback On.

NoteSetting Gain above 100 percent can result in over-correction, but is sometimes necessary to overcome damping from other system settings, such as IK damping.

Periodic Variation group

These settings introduce variations into the force by affecting the Basic Force value randomly. You can set two waveforms to produce a noise effect.

Enable

Turns on the variations.

Period 1

The time over which the noise variation makes a full cycle. For example, a setting of 20 means one cycle per 20 frames.

Amplitude 1

The strength of the variation (in percent). This option uses the same types of units as the Basic Force spinner.

Phase 1

Offsets the variation pattern.

Period 2

Provides an additional variation pattern (a second wave) to increase the noise.

Amplitude 2

The strength of the variation of the second wave (in percent). This option uses the same types of units as the Basic Force spinner.

Phase 2

Offsets the variation pattern of the second wave.

Particle Effect Range group

Lets you restrict the Push effect's range to a specific volume. This affects particle systems only; it has no effect on dynamics.

Enable

When on, limits the range of the effect to a sphere, displayed as a tri-hooped sphere. The effect falls off increasingly as the particles near the boundary of the sphere.

Range

Specifies the radius of the range of the effect, in units.

Display Icon group

Icon Size

Sets the size of the Push icon. This is for display purposes only, and does not alter the Push effect.