CPU-based 3D particle emitter. CPU-based 3D particle node used to create a variety of particle systems and effects. See also [Particles], which provides the same functionality with hardware acceleration, but may not run on older devices. Sets this node's properties to match a given [Particles] node with an assigned [ParticlesMaterial]. Restarts the particle emitter. Number of particles emitted in one emission cycle. Initial rotation applied to each particle, in degrees. Each particle's rotation will be animated along this [Curve]. Rotation randomness ratio. Initial angular velocity applied to each particle. Sets the speed of rotation of the particle. Each particle's angular velocity will vary along this [Curve]. Angular velocity randomness ratio. Particle animation offset. Each particle's animation offset will vary along this [Curve]. Animation offset randomness ratio. Particle animation speed. Each particle's animation speed will vary along this [Curve]. Animation speed randomness ratio. Unused for 3D particles. Unused for 3D particles. The rate at which particles lose velocity. Damping will vary along this [Curve]. Damping randomness ratio. Unit vector specifying the particles' emission direction. Particle draw order. Uses [enum DrawOrder] values. The rectangle's extents if [member emission_shape] is set to [constant EMISSION_SHAPE_BOX]. Particles will be emitted inside this region. See [enum EmissionShape] for possible values. The sphere's radius if [enum EmissionShape] is set to [constant EMISSION_SHAPE_SPHERE]. If [code]true[/code], particles are being emitted. How rapidly particles in an emission cycle are emitted. If greater than [code]0[/code], there will be a gap in emissions before the next cycle begins. The particle system's frame rate is fixed to a value. For instance, changing the value to 2 will make the particles render at 2 frames per second. Note this does not slow down the particle system itself. Align Y axis of particle with the direction of its velocity. If [code]true[/code], particles will not move on the z axis. If [code]true[/code], particles rotate around Y axis by [member angle]. Amount of [member spread] in Y/Z plane. A value of [code]1[/code] restricts particles to X/Z plane. If [code]true[/code], results in fractional delta calculation which has a smoother particles display effect. Gravity applied to every particle. Initial hue variation applied to each particle. Each particle's hue will vary along this [Curve]. Hue variation randomness ratio. Initial velocity magnitude for each particle. Direction comes from [member spread] and the node's orientation. Initial velocity randomness ratio. Amount of time each particle will exist. Linear acceleration applied to each particle in the direction of motion. Each particle's linear acceleration will vary along this [Curve]. Linear acceleration randomness ratio. If [code]true[/code], particles use the parent node's coordinate space. If [code]false[/code], they use global coordinates. The [Mesh] used for each particle. If [code]null[/code], particles will be spheres. If [code]true[/code], only one emission cycle occurs. If set [code]true[/code] during a cycle, emission will stop at the cycle's end. Orbital velocity applied to each particle. Makes the particles circle around origin in the local XY plane. Specified in number of full rotations around origin per second. This property is only available when [member flag_disable_z] is [code]true[/code]. Each particle's orbital velocity will vary along this [Curve]. Orbital velocity randomness ratio. Particle system starts as if it had already run for this many seconds. Radial acceleration applied to each particle. Makes particle accelerate away from origin. Each particle's radial acceleration will vary along this [Curve]. Radial acceleration randomness ratio. Emission lifetime randomness ratio. Initial scale applied to each particle. Each particle's scale will vary along this [Curve]. Scale randomness ratio. Particle system's running speed scaling ratio. A value of [code]0[/code] can be used to pause the particles. Each particle's initial direction range from [code]+spread[/code] to [code]-spread[/code] degrees. Applied to X/Z plane and Y/Z planes. Tangential acceleration applied to each particle. Tangential acceleration is perpendicular to the particle's velocity giving the particles a swirling motion. Each particle's tangential acceleration will vary along this [Curve]. Tangential acceleration randomness ratio. Particles are drawn in the order emitted. Particles are drawn in order of remaining lifetime. Particles are drawn in order of depth. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set initial velocity properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set angular velocity properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set orbital velocity properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set linear acceleration properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set radial acceleration properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set tangential acceleration properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set damping properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set angle properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set scale properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set hue variation properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set animation speed properties. Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set animation offset properties. Represents the size of the [enum Parameter] enum. Use with [method set_flag] to set [member flag_align_y]. Use with [method set_flag] to set [member flag_rotate_y]. Use with [method set_flag] to set [member flag_disable_z]. Represents the size of the [enum Flags] enum. All particles will be emitted from a single point. Particles will be emitted in the volume of a sphere. Particles will be emitted in the volume of a box. Particles will be emitted at a position chosen randomly among [member emission_points]. Particle color will be modulated by [member emission_colors]. Particles will be emitted at a position chosen randomly among [member emission_points]. Particle velocity and rotation will be set based on [member emission_normals]. Particle color will be modulated by [member emission_colors].