GPU Particles

Overview

Sets parameters related to GPU particles. The particles of the node set here will be emitters, and GPU particles will be spawned.

While normal particles are processed by the CPU, GPU particles are processed by the GPU, so you can use a large number of particles (MaMore than 1 million particles).

GPU particles are only supported by modern graphics APIs.

Target	Support	Notes
DirectX 9	❌
DirectX 11	✅	Shader Model 5.0 or later
DirectX 12	✅
OpenGL	❌
Vulkan	✅
Metal	✅
WebGL	❌

Target	Support	Notes
Unity	❌	Supported in the future
Unreal Engine	❌	Supported in the future
Godot Engine	❌	Supported in the future

Parameters

GPU particles are calculated on the GPU, so the functionality is simplified.

Enabled

Enable GPU particles if checked.

Basic

Settings related to GPU particle spawn. When GPU particles are started, memory is allocated from the particle buffer for Spawn Amount * Time to live.

Spawn count

The total number of particles to be spawned.The program will stop after this number of particles have been created.

If Infinity is enabled, it will keep spawning particles indefinitely. It will stop spawning particles when the parent particle is destroyed or when an external request to stop is made.

Spawn Amount

The amount of particles spawned per frame. You can increase the density of particles by increasing this value.

Initial Delay

This is the time to start emitting particles. Particle emission can be delayed.

Time to live

Lifetime of particles. It affects how fast the various parameters change.

Emission

Sets parameters related to the shape of the particle emission source. The actual shape is affected by the transform (Position, Rotation and Scaling) of the parent particle.

Emission Shape

Sets the type of shape of the particle emitter. Supports Point, Line, Circle, Sphere, and Model.

Point shape	Line shape	Circle shape	Sphere shape	Model shape

Parameters for Point shape

There are no parameters for point shapes.

Parameters for Line shape

In the case of a line shape, particles are spawned from a line segment connecting two points at the Start Point and End Point. If you increase the Line Tickness of the line, it becomes a cone-like shape.

Parameters for Circle shape

For a circular shape, particles are spawned from a circle with the Circle Axis as its central axis. The radius of the circle is determined by the Inner Radius and Outer Radius of the circle.

Parameters for Sphere shapes

For spherical shapes, particles are spawned from the surface of a sphere determined by the Sphere radius.

parameters for Model shape

For model shapes, the Mesh to use will generate particles from the surface of the model's mesh. You can specify the Size separately.

Position

Set the parameters for the position and movement of the particles. The particle position is also affected by the Force based on the parameters set here.

Direction

This is the direction vector for particle spawn.

Spread

The angle to randomly spread particles in the direction of movement when spawning particles. The range is from 0 to 180 degrees; 0 degrees has no randomness, 90 degrees diffuses in a hemispherical shape, and 180 degrees diffuses in all directions.

Initial Speed

The speed at which particles are spawned. This parameter affects the initial velocity. A random range can be set.

Damping

Damping force during particle motion.Increasing this parameter will slow down the particles as they move. A random range can be set.

Rotation

Sets parameters for particle tilt and rotation. The appearance depends on the billboard settings of the drawing shape. Fixed affects the XYZ parameters, while Z-axis rotation billboards affect the Z parameters.

Initial Angle

Angle (Euler) at particle spawn. A random range can be set.

Angular Velocity

The speed at which the particles rotation (Euler). A random range can be set.

Scale

Sets the size of the particles and the parameters for scaling them up and down. The behavior changes depending on the mode you set.

• In Fixed mode, the particles are fixed at the zoom factor you set.

• In Easing mode, the scale changes from the start point to the end point.

Single Scale

Fixed scale, independent of the axis. A random range can be set.

XYZ Scale

Fixed scale for each of the XYZ axes. A random range can be set.

Start and End (Single)

The start and end scale for axis-independent easing. A random range can be set.

Start and End (XYZ)

Scale of the start and end points of easing applied to each of the XYZ axes. A random range can be set.

Force

This parameter specifies the effect of externally exerting a force on the particles.

Gravity	Vortex	Turbulence

Gravity

Applies acceleration in the specified direction.It can be applied to the top or right, not necessarily the bottom.This direction is not affected by the attitude of the parent particle.

Vortex

Applies a force that rotates around a specified Center Point and Axis. You can also adjust the force given to the particle from the tornado by changing the Rotational Force and Attraction Force.

Turbulence

Vector fields spawned by the Random Seed, Field Scale and Complexity allow particles to make noisy motions. You can also adjust the force exerted on the particles from turbulence by changing the Power.

Rendering

General settings for rendering particles.

Blend

Blending settings when drawing.

Depth Write

Turn ON to write depth.

Depth Test

Turn ON to perform depth test.

Shape

Sets the shape of particles when they are drawn.

Shape

Select a shape from the following three types.

Shape Type	Description
Sprite	Draws simple quads.
Model	Draws user models.
Trail	Draws line connecting the locations of the trajectory along which the particles is moving.

Billboard

Specify how the sprite is placed in relation to the particle.

Billboard Type	Description
Rotated Billboard	Sprite rotates along the Z-axis while facing the viewpoint.
Directional Billboard	Sprite rotates along Y+ direction to the moving direction while facing the viewpoint side.
Fixed Y-Axis	Sprite faces viewpoint side while fixed to Y-axis.
Fixed	Sprite orientation follows particle rotation.

Model

Specifies the user model to be drawn.

Trail Length

Specifies the length of the trajectory. Increasing this parameter will increase the length of the trajectory and the memory size allocated from the trajectory buffer.

Shape Size

Specifies the size of the particle's drawn shape. This is multiplied by the Scale factor parameter. If the shape is a locus, it will affect the thickness.

Color

Sets parameters for particle color.

Color inheritance

Color Inheritance allows you to influence the color of the parent particle.

Color All

Sets the particle's color.

Color Type	Description
Fixed	Sets a fixed color that does not change.
Random	Sets two colors that are randomly determined during particle spawn.
Easing	Sets the color of the starting point and the end point. The color changes over the particle's lifetime.
F-curve	Sets the F-curve depicting the RGBA change.
Gradient	Sets the gradient depicting a RGBA change.

Emissive Scaling

Multiplier for particle luminance. This parameter is multiplied by the RGB of the Color All.

Fade-In

Makes the particles fade in when they spawned.

Fade-Out

Makes the particles fade out when they disappear.

Material

Sets the material used to draw the particles.

Material Type

Type	Description
Unlit	Not shaded by the light source
Lighting	Shaded by the light source

Color Texture

Color textures are used to render particles.

Normal Texture

Can be set when the material type is Lighting. Normal texture used to draw particles.