Child Particle Speed Inheritance

Child particles can be made to move along the same trajectory as their parent particle by having them inherit the velocity of the parent particle at the time of their emission as their own initial velocity. Even more natural motion can be achieved by applying changes to the inherited initial velocity.

This section describes how to make children inherit the velocity of their parent.

For more about child particle settings, click here.

Loading sample data

Use CreativeStudio to load the sample data prepared in the following folder.

" %NW4C_ROOT%/SampleData/Effect/Intermediate/ManualResource/Snow_Crystal_Particle/Snow_Crystal_Particle.cptl "

Set the length of the timeline to 300 frames or higher in order to confirm the entire animation.

Checking Particles

Sample data causes the following two child particles to be emitted from the emitting source Snow_Crystal_Particle.

  1. Snow_Crystal_Glow_Particle is an effect in which faintly glimmering snow crystals fall and fade, while trailed in the same direction by smaller crystals.
  2. Snow_Crystal_Shine_Particle drops snowflake crystals that gradually lose speed due to air resistance while glimmering faintly.
Completed texture image

Faintly Glimmering Snowflakes

Capture image of Snow_Crystal_Glow_Particle

Confirm the Configuration

(1) On the Contents, select Snow_Crystal_Glow_Particle to open the particle Properties panel.

Snow_Crystal_Glow_Particle Contents panel

(2) Go to the General section of the particle Properties panel. Select the checkbox Children inherit velocity from parents.

Snow_Crystal_Glow_Particle particle set Properties panel

With this setting, Snow_Crystal_Glow_Particle moves downward trailing smaller crystals that inherit the velocity of their parent at the time they are emitted as their own initial velocity.

If children did not inherit the velocity of their parent

(1) Unselect the checkbox Children inherit velocity from parent in the General section on the particle Properties panel displayed for Snow_Crystal_Glow_Particle.

Snow_Crystal_Glow_Particle property OFF

(2) Because children do not inherit their velocity from their emitter, Snow_Crystal_Particle, they appear static and disappear before long.

Preview when velocity is not inherited

As shown, when child particles are emitted from parent particles they can be made to inherit the parent's velocity as their own initial velocity just by selecting this checkbox.

Trickling Crystals

The second child particle represents trickling snow crystals that gradually lose speed due to air resistance while tracking the path of the falling snowflake.

Capture image of Snow_Crystal_Shine_Particle

Varying the velocity inherited as initial velocity from the parent

This section describes how to vary the velocity inherited as the initial velocity using the child particle, Snow_Crystal_Shine_Particle, when child particles are emitted from the emission source, Snow_Crystal_Particle.

(1) Select Snow_Crystal_Shine_Particle, and check that Children inherit velocity from parent in the General section on the particle Properties panel is selected.

Snow_Crystal_Shine_Particle Properties ON

(2) Change the rate of acceleration in the Speed section of the particle Properties panel.

Snow_Crystal_Shine_Particle acceleration/deceleration_X1

(3) Change the rate of acceleration using the slider. Check that the velocity inherited as initial velocity appears to change on the Preview screen.

Snow_Crystal_Shine_Particle acceleration/deceleration

In this way, more natural motion can be achieved by applying changes to the inherited initial velocity.


CONFIDENTIAL