Initial Velocity Animation

Initial velocity animation changes the initial speed of a particle at time of emission.

Initial Velocity Animation

Initial velocity is the speed instantaneously inherited when a particle is emitted from a particle emitter. If there is no effect of an external force, such as gravity, the particle will maintain this initial velocity as it moves.

Spread Out from Y Axis

You can configure Spread Out from Y Axis from the Speed item on the particle set panel. Causes particles to spread out horizontally outwardly from the central (Y) axis of the particle emitter.

Feature

You can specify the speed at which particles spread out from the Y axis. Speed is only applied in the X-Z plane.

Parameters

Use the following parameters to configure Spread Out from Y Axis.

Parameters Description
Speed Specifies the speed at which particles spread out from the Y axis.

Overview

The figure below shows how particles spread out from the Y axis for a point-shaped emitter.

Spread Out from Y Axis

Spread Out from Origin

You can configure Spread Out from Origin from the Speed item on the particle set panel. Causes particles to spread out from the emitter origin.

Feature

You can specify the initial speed at which particles spread out from the emitter origin. The direction of emission will differ depending on the emitter shape.

The emission directions for each emitter shape are as follows.

Emitter shape Emission direction
Point All directions
Disc Horizontal
Sphere Outwards from sphere surface
Cylinder Outwards from the cylinder face (though not from the cylinder ends)
Rectangle Horizontal
Cube Outwards from the inside of the cube

Parameters

Use the following parameters to configure Spread Out from Origin.

Parameters Description
Speed Specifies the speed at which particles spread out from the origin.

Conceptual Diagram

The figure below shows how particles spread out from the origin of a disc-shaped emitter.

Spread Out from Origin

Random Direction

You can configure Random Direction from the Speed item on the particle set panel. You can randomly change the initial direction and speed of a particle at the time of emission.

Feature

Randomly changes a particle's direction and speed. Use this to emit multiple particles in random directions, much as for Spread Out from Origin.

Parameters

Use the following parameters to configure Random Direction.

Parameters Description
Speed Specifies the initial speed.

Specified Direction

You can configure Specified Direction from the Speed item on the particle set panel. Specifies the initial direction and speed of a particle at the time of emission.

Feature

Gives a particle a specific direction and speed.

Parameters

Use the following parameters to configure Specified Direction.

Parameters Description
Direction: Specifies the direction of movement.
Speed Specifies the initial speed.

Conceptual Diagram

The figure below shows a direction (X, Y, Z = 1, 1, 0) and speed (0.1) applied to a particle after emission from an emitter.

Specified Direction

Specified Random Direction

You can configure Random Direction from the Speed item on the particle set panel. Particles can be made to spread out.

Feature

By setting a random value for the angle, you can make particles spread out in random directions from within the area of the conical shape versus the direction of advance of particles.

Parameters

Parameters Description
Direction: Specifies the direction of movement.
Speed Specifies the initial speed.
Random angle Randomly specifies the angle at which a particle should spread versus the direction of advance of the particle.

Conceptual Diagram

The figure below shows the direction (X, Y, Z = 1, 1, 0), speed (0.1) and random angle (45) applied to the particle after emission from an emitter.

Specified Random Direction

Randomize Results

You can configure Randomize Results from the Speed item on the particle set panel. Randomness can be applied to the instantaneous speed (initial velocity) when a particle is generated from a emitter.

Feature

Randomizes the speed of particles after emission by factoring with a random value.

Random Value Formula

Result Speed ± (Random Number × Result Speed)

Parameters

Use the following parameters to configure Randomize Results.

Parameters Description
Amplitude (%) Specifies the random number ratio (0.5 in the formula)

CONFIDENTIAL