Speed Animation

Speed animation changes the speed of a particle after emission.

Speed Animation

Acceleration/Deceleration

You can configure Acceleration/Deceleration from the Speed item on the particle set panel. You can cause particles to speed up or slow down.

Feature

Multiplies particle speeds by a specified value every frame.

Parameters

Use the following parameters to configure Acceleration/Deceleration.

Parameters Description
Ratio Specifies the value by which particle speeds are multiplied every frame. Practical values range from 0.9 to 1.1, but you can also use values beyond this range.

Conceptual Diagram

The figure below shows how the speed of a moving particle changes as the Ratio is applied.

Acceleration/Deceleration

Gravity (accelerate in specified direction)

Main Use

You can configure Gravity from the Speed item on the particle set panel. You can cause a particle to move in the specified direction with inertia in a realistic manner.

Feature

Multiplies the direction by a specified value every frame to change the particle's direction.

Parameters

Use the following parameters to configure Gravity.

Parameters Description
Direction: Specifies the direction in which the particle moves in terms of X, Y, and Z values. Valid values range between -1 and 1.
Speed Specifies the value to add every frame to the particle's speed.

Conceptual Diagram

The figure below shows how the speed of a moving particle changes when Gravity is configured.

Gravity

Randomness (velocity)

You can set randomness (speed) for animations using the Speed item on the Particle Set panel. You can make each particle gradually speed up.

Feature

Adds a random value to the particle's speed.

Parameters

Use the following parameters to configure randomness (velocity).

Parameters Description
Strength Specifies the value added to the particle's speed.
Frame Interval Specifies the interval for adding values to the particle's speed, as a number of frames.
Formula When Randomizing Child Particle Inherited Values

(Parent Particle Speed + Child Particle Speed) × Random Number


CONFIDENTIAL