A few examples of creating particles2D in godot using only gdscript

my_particles2d_01.gd

class_name MyParticles2D01
extends Particles2D


# Declare member variables here. Examples:
# var a = 2
# var b = "text"


# Called when the node enters the scene tree for the first time.
func _ready():
	self.emitting = true
	self.amount = 40
	
	#Time:
	self.lifetime = 1.5
	self.one_shot = false
	self.preprocess = 0
	self.speed_scale = 1
	self.explosiveness = 0.07
	self.randomness = 0
	self.fixed_fps = 0
	self.fract_delta = true
	
	#Drawing:
	self.visibility_rect = Rect2(-100, -100, 200, 200)
	self.local_coords = true
	self.draw_order = Particles2D.DRAW_ORDER_INDEX
	
	#Process Material:
	self.process_material = self.get_process_material()
	
	# Textures:
	self.texture = load("res://resources/floaty_64.png")
	
	# Transform:
#	self.transform = Transform2D()
	self.z_index = 0
	self.z_as_relative = true
	
	# Material:
	self.material = self.get_material()

func get_process_material() -> Material:
	var my_m := ParticlesMaterial.new()
	my_m.render_priority = 0
	my_m.next_pass = null
	
	# Time:
	my_m.lifetime_randomness = 0
	
	# Trail:
	my_m.trail_divisor = 1
	my_m.trail_size_modifier = null
	my_m.trail_color_modifier = null
	
	# Emission Shape:
	my_m.emission_shape = ParticlesMaterial.EMISSION_SHAPE_SPHERE
	my_m.emission_sphere_radius = 12
	my_m.emission_ring_axis = Vector3(0, 0, 0)
	
	# Flags:
	my_m.flag_align_y = false
	my_m.flag_rotate_y = false
	my_m.flag_disable_z = true
	
	# Direction:
	my_m.direction = Vector3(1, 0, 1)
	my_m.spread = 180
	my_m.flatness = 0
	
	# Gravity
	my_m.gravity = Vector3(0, -100, 0)
	
	# Initial Velocity:
	my_m.initial_velocity = 50
	my_m.initial_velocity_random = 0
	
	# Angular Velocity:
	my_m.angular_velocity = 100
	my_m.angular_velocity_random = 1
	my_m.angular_velocity_curve = null
	
	# Orbit Velocity:
	my_m.orbit_velocity = 0
	my_m.orbit_velocity_random = 0
	my_m.orbit_velocity_curve = null
	
	# Linear Accel
	my_m.linear_accel = 0
	my_m.linear_accel_random = 0
	my_m.linear_accel_curve = null
	
	# Radial Accel:
	my_m.radial_accel = 0
	my_m.radial_accel_random = 0
	my_m.radial_accel_curve = null
	
	# Tangential Accel:
	my_m.tangential_accel = 0
	my_m.tangential_accel_random = 0
	my_m.tangential_accel_curve = null
	
	# Damping:
	my_m.damping = 50
	my_m.damping_random = 0
	my_m.damping_curve = null
	
	# Angle:
	my_m.angle = 360
	my_m.angle_random = 1
	my_m.angle_curve = null
	
	# Scale:
	my_m.scale = 1
	my_m.scale_random = 0.2
	my_m.scale_curve = null
	
	# Color:
	my_m.color = Color.gray
	
	# Hue Variation:
	my_m.hue_variation = 0.01
	my_m.hue_variation_random = 1
	my_m.hue_variation_curve = null
	
	# Animation:
	my_m.anim_speed = 1
	my_m.anim_speed_random = 0
	my_m.anim_speed_curve = null
	my_m.anim_offset = 0
	my_m.anim_offset_random = 0
	my_m.anim_offset_curve = null
	
	
	
	return my_m

func get_material() -> Material:
	var my_m := CanvasItemMaterial.new()
	my_m.blend_mode = CanvasItemMaterial.BLEND_MODE_ADD
	my_m.light_mode = CanvasItemMaterial.LIGHT_MODE_NORMAL
	my_m.particles_animation = true
	my_m.particles_anim_h_frames = 7
	my_m.particles_anim_v_frames = 7
	my_m.particles_anim_loop = false
	my_m.render_priority = 0
	my_m.next_pass = null
	
	return my_m
	

# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#	pass

my_particles2d_02.gd

class_name MyParticles2D02
extends Particles2D


# Declare member variables here. Examples:
# var a = 2
# var b = "text"


# Called when the node enters the scene tree for the first time.
func _ready():
	self.emitting = true
	self.amount = 20
	
	#Time:
	self.lifetime = 1
	self.one_shot = false
	self.preprocess = 0
	self.speed_scale = 1
	self.explosiveness = 0.0
	self.randomness = 0
	self.fixed_fps = 0
	self.fract_delta = true
	
	#Drawing:
	self.visibility_rect = Rect2(-100, -100, 200, 200)
	self.local_coords = true
	self.draw_order = Particles2D.DRAW_ORDER_INDEX
	
	#Process Material:
	self.process_material = self.get_process_material()
	
	# Textures:
	self.texture = load("res://resources/offset_glow.png")
	
	# Transform:
#	self.transform = Transform2D()
	self.z_index = 0
	self.z_as_relative = true
	
	# Material:
	self.material = self.get_material()

func get_process_material() -> Material:
	var my_m := ParticlesMaterial.new()
	my_m.render_priority = 0
	my_m.next_pass = null
	
	# Time:
	my_m.lifetime_randomness = 0
	
	# Trail:
	my_m.trail_divisor = 1
	my_m.trail_size_modifier = null
	my_m.trail_color_modifier = null
	
	# Emission Shape:
	my_m.emission_shape = ParticlesMaterial.EMISSION_SHAPE_SPHERE
	my_m.emission_sphere_radius = 5
	my_m.emission_ring_axis = Vector3(0, 0, 1)
	
	# Flags:
	my_m.flag_align_y = false
	my_m.flag_rotate_y = false
	my_m.flag_disable_z = true
	
	# Direction:
	my_m.direction = Vector3(1, 0, 0)
	my_m.spread = 45
	my_m.flatness = 0
	
	# Gravity
	my_m.gravity = Vector3(0, -150, 0)
	
	# Initial Velocity:
	my_m.initial_velocity = 0
	my_m.initial_velocity_random = 0
	
	# Angular Velocity:
	my_m.angular_velocity = 1
	my_m.angular_velocity_random = 1
	my_m.angular_velocity_curve = null
	
	# Orbit Velocity:
	my_m.orbit_velocity = 0
	my_m.orbit_velocity_random = 0
	my_m.orbit_velocity_curve = null
	
	# Linear Accel
	my_m.linear_accel = 0
	my_m.linear_accel_random = 0
	my_m.linear_accel_curve = null
	
	# Radial Accel:
	my_m.radial_accel = 0
	my_m.radial_accel_random = 0
	my_m.radial_accel_curve = null
	
	# Tangential Accel:
	my_m.tangential_accel = 0
	my_m.tangential_accel_random = 0
	my_m.tangential_accel_curve = null
	
	# Damping:
	my_m.damping = 0
	my_m.damping_random = 0
	my_m.damping_curve = null
	
	# Angle:
	my_m.angle = 360
	my_m.angle_random = 1
	my_m.angle_curve = null
	
	# Scale:
	my_m.scale = 0.5
	my_m.scale_random = 0.3
	my_m.scale_curve = null
	
	# Color:
	my_m.color = Color.gray
	
	# Hue Variation:
	my_m.hue_variation = 0.0
	my_m.hue_variation_random = 0
	my_m.hue_variation_curve = null
	
	# Animation:
	my_m.anim_speed = 0
	my_m.anim_speed_random = 0
	my_m.anim_speed_curve = null
	my_m.anim_offset = 0
	my_m.anim_offset_random = 0
	my_m.anim_offset_curve = null
	
	
	
	return my_m

func get_material() -> Material:
	var my_m := CanvasItemMaterial.new()
	my_m.blend_mode = CanvasItemMaterial.BLEND_MODE_ADD
	my_m.light_mode = CanvasItemMaterial.LIGHT_MODE_NORMAL
	my_m.particles_animation = false
#	my_m.particles_anim_h_frames = 7
#	my_m.particles_anim_v_frames = 7
#	my_m.particles_anim_loop = false
	my_m.render_priority = 0
	my_m.next_pass = null
	
	return my_m
	

# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#	pass

my_particles2d_03.gd

class_name MyParticles2D03
extends Particles2D


# Declare member variables here. Examples:
# var a = 2
# var b = "text"


# Called when the node enters the scene tree for the first time.
func _ready():
	self.emitting = true
	self.amount = 6
	
	#Time:
	self.lifetime = 1
	self.one_shot = false
	self.preprocess = 0
	self.speed_scale = 1
	self.explosiveness = 0.0
	self.randomness = 0
	self.fixed_fps = 0
	self.fract_delta = true
	
	#Drawing:
	self.visibility_rect = Rect2(-100, -100, 200, 200)
	self.local_coords = true
	self.draw_order = Particles2D.DRAW_ORDER_INDEX
	
	#Process Material:
	self.process_material = self.get_process_material()
	
	# Textures:
	self.texture = load("res://resources/random_selection.png")
	
	# Transform:
	self.transform = Transform2D(0.0, Vector2(-4, -4))
	self.z_index = 0
	self.z_as_relative = true
	
	# Material:
	self.material = self.get_material()

func get_process_material() -> Material:
	var my_m := ParticlesMaterial.new()
	my_m.render_priority = 0
	my_m.next_pass = null
	
	# Time:
	my_m.lifetime_randomness = 0
	
	# Trail:
	my_m.trail_divisor = 1
	my_m.trail_size_modifier = null
	my_m.trail_color_modifier = null
	
	# Emission Shape:
	my_m.emission_shape = ParticlesMaterial.EMISSION_SHAPE_POINT
	my_m.emission_ring_axis = Vector3(0, 0, 1)
	
	# Flags:
	my_m.flag_align_y = false
	my_m.flag_rotate_y = false
	my_m.flag_disable_z = true
	
	# Direction:
	my_m.direction = Vector3(1, 0, 0)
	my_m.spread = 45
	my_m.flatness = 0
	
	# Gravity
	my_m.gravity = Vector3(0, 0, 0)
	
	# Initial Velocity:
	my_m.initial_velocity = 0
	my_m.initial_velocity_random = 0
	
	# Angular Velocity:
	my_m.angular_velocity = 0
	my_m.angular_velocity_random = 0
	my_m.angular_velocity_curve = null
	
	# Orbit Velocity:
	my_m.orbit_velocity = 0
	my_m.orbit_velocity_random = 0
	my_m.orbit_velocity_curve = null
	
	# Linear Accel
	my_m.linear_accel = 0
	my_m.linear_accel_random = 0
	my_m.linear_accel_curve = null
	
	# Radial Accel:
	my_m.radial_accel = 0
	my_m.radial_accel_random = 0
	my_m.radial_accel_curve = null
	
	# Tangential Accel:
	my_m.tangential_accel = 0
	my_m.tangential_accel_random = 0
	my_m.tangential_accel_curve = null
	
	# Damping:
	my_m.damping = 0
	my_m.damping_random = 0
	my_m.damping_curve = null
	
	# Angle:
	my_m.angle = 360
	my_m.angle_random = 1
	my_m.angle_curve = null
	
	# Scale:
	my_m.scale = 1
	my_m.scale_random = 0.3
	my_m.scale_curve = null
	
	# Color:
	my_m.color = Color.gray
	
	# Hue Variation:
	my_m.hue_variation = 0.2
	my_m.hue_variation_random = 1
	my_m.hue_variation_curve = null
	
	# Animation:
	my_m.anim_speed = 0
	my_m.anim_speed_random = 0
	my_m.anim_speed_curve = null
	my_m.anim_offset = 1
	my_m.anim_offset_random = 1
	my_m.anim_offset_curve = null
	
	
	
	return my_m

func get_material() -> Material:
	var my_m := CanvasItemMaterial.new()
	my_m.blend_mode = CanvasItemMaterial.BLEND_MODE_ADD
	my_m.light_mode = CanvasItemMaterial.LIGHT_MODE_NORMAL
	my_m.particles_animation = true
	my_m.particles_anim_h_frames = 3
	my_m.particles_anim_v_frames = 1
#	my_m.particles_anim_loop = false
	my_m.render_priority = 0
	my_m.next_pass = null
	
	return my_m
	

# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#	pass

my_particles2d_04.gd

class_name MyParticles2D04
extends Particles2D


# Declare member variables here. Examples:
# var a = 2
# var b = "text"


# Called when the node enters the scene tree for the first time.
func _ready():
	self.emitting = true
	self.amount = 4
	
	#Time:
	self.lifetime = 1
	self.one_shot = false
	self.preprocess = 0
	self.speed_scale = 1
	self.explosiveness = 0.0
	self.randomness = 0
	self.fixed_fps = 0
	self.fract_delta = true
	
	#Drawing:
	self.visibility_rect = Rect2(-100, -100, 200, 200)
	self.local_coords = true
	self.draw_order = Particles2D.DRAW_ORDER_INDEX
	
	#Process Material:
	self.process_material = self.get_process_material()
	
	# Textures:
	self.texture = load("res://resources/effect_4.png")
	
	# Transform:
	self.transform = Transform2D(0.0, Vector2(-7, -6))
	self.z_index = 0
	self.z_as_relative = true
	
	# Material:
	self.material = self.get_material()

func get_process_material() -> Material:
	var my_m := ParticlesMaterial.new()
	my_m.render_priority = 0
	my_m.next_pass = null
	
	# Time:
	my_m.lifetime_randomness = 0
	
	# Trail:
	my_m.trail_divisor = 1
	my_m.trail_size_modifier = null
	my_m.trail_color_modifier = null
	
	# Emission Shape:
	my_m.emission_shape = ParticlesMaterial.EMISSION_SHAPE_POINT
	my_m.emission_ring_axis = Vector3(0, 0, 1)
	
	# Flags:
	my_m.flag_align_y = false
	my_m.flag_rotate_y = false
	my_m.flag_disable_z = true
	
	# Direction:
	my_m.direction = Vector3(1, 0, 0)
	my_m.spread = 45
	my_m.flatness = 0
	
	# Gravity
	my_m.gravity = Vector3(0, 0, 0)
	
	# Initial Velocity:
	my_m.initial_velocity = 0
	my_m.initial_velocity_random = 0
	
	# Angular Velocity:
	my_m.angular_velocity = -100
	my_m.angular_velocity_random = 0
	my_m.angular_velocity_curve = null
	
	# Orbit Velocity:
	my_m.orbit_velocity = 0
	my_m.orbit_velocity_random = 0
	my_m.orbit_velocity_curve = null
	
	# Linear Accel
	my_m.linear_accel = 0
	my_m.linear_accel_random = 0
	my_m.linear_accel_curve = null
	
	# Radial Accel:
	my_m.radial_accel = 0
	my_m.radial_accel_random = 0
	my_m.radial_accel_curve = null
	
	# Tangential Accel:
	my_m.tangential_accel = 0
	my_m.tangential_accel_random = 0
	my_m.tangential_accel_curve = null
	
	# Damping:
	my_m.damping = 0
	my_m.damping_random = 0
	my_m.damping_curve = null
	
	# Angle:
	my_m.angle = 360
	my_m.angle_random = 1
	my_m.angle_curve = null
	
	# Scale:
	my_m.scale = 1
	my_m.scale_random = 0.0
	my_m.scale_curve = null
	
	# Color:
	my_m.color = Color.gray
	
	# Hue Variation:
	my_m.hue_variation = 0.0
	my_m.hue_variation_random = 0
	my_m.hue_variation_curve = null
	
	# Animation:
	my_m.anim_speed = 0
	my_m.anim_speed_random = 0
	my_m.anim_speed_curve = null
	my_m.anim_offset = 0
	my_m.anim_offset_random = 0
	my_m.anim_offset_curve = null
	
	
	
	return my_m

func get_material() -> Material:
	var my_m := CanvasItemMaterial.new()
	my_m.blend_mode = CanvasItemMaterial.BLEND_MODE_ADD
	my_m.light_mode = CanvasItemMaterial.LIGHT_MODE_NORMAL
	my_m.particles_animation = false
#	my_m.particles_anim_h_frames = 3
#	my_m.particles_anim_v_frames = 1
#	my_m.particles_anim_loop = false
	my_m.render_priority = 0
	my_m.next_pass = null
	
	return my_m
	

# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#	pass

my_particles2d_05.gd

class_name MyParticles2D05
extends Particles2D


# Declare member variables here. Examples:
# var a = 2
# var b = "text"


# Called when the node enters the scene tree for the first time.
func _ready():
	self.emitting = true
	self.amount = 5
	
	#Time:
	self.lifetime = 1
	self.one_shot = false
	self.preprocess = 0
	self.speed_scale = 1
	self.explosiveness = 0.08
	self.randomness = 0
	self.fixed_fps = 0
	self.fract_delta = true
	
	#Drawing:
	self.visibility_rect = Rect2(-100, -100, 200, 200)
	self.local_coords = true
	self.draw_order = Particles2D.DRAW_ORDER_INDEX
	
	#Process Material:
	self.process_material = self.get_process_material()
	
	# Textures:
	self.texture = load("res://resources/spotlight_8.png")
	
	# Transform:
	self.transform = Transform2D(0.0, Vector2(-11, -6))
	self.z_index = 0
	self.z_as_relative = true
	
	# Material:
	self.material = self.get_material()

func get_process_material() -> Material:
	var my_m := ParticlesMaterial.new()
	my_m.render_priority = 0
	my_m.next_pass = null
	
	# Time:
	my_m.lifetime_randomness = 0
	
	# Trail:
	my_m.trail_divisor = 1
	my_m.trail_size_modifier = null
	my_m.trail_color_modifier = null
	
	# Emission Shape:
	my_m.emission_shape = ParticlesMaterial.EMISSION_SHAPE_BOX
	my_m.emission_box_extents = Vector3(20, 30, 1)
	my_m.emission_ring_axis = Vector3(0, 0, 1)
	
	# Flags:
	my_m.flag_align_y = false
	my_m.flag_rotate_y = false
	my_m.flag_disable_z = true
	
	# Direction:
	my_m.direction = Vector3(1, 0, 0)
	my_m.spread = 45
	my_m.flatness = 0
	
	# Gravity
	my_m.gravity = Vector3(0, 0, 0)
	
	# Initial Velocity:
	my_m.initial_velocity = 0
	my_m.initial_velocity_random = 0
	
	# Angular Velocity:
	my_m.angular_velocity = 0
	my_m.angular_velocity_random = 0
	my_m.angular_velocity_curve = null
	
	# Orbit Velocity:
	my_m.orbit_velocity = 0
	my_m.orbit_velocity_random = 0
	my_m.orbit_velocity_curve = null
	
	# Linear Accel
	my_m.linear_accel = 0
	my_m.linear_accel_random = 0
	my_m.linear_accel_curve = null
	
	# Radial Accel:
	my_m.radial_accel = 0
	my_m.radial_accel_random = 0
	my_m.radial_accel_curve = null
	
	# Tangential Accel:
	my_m.tangential_accel = 0
	my_m.tangential_accel_random = 0
	my_m.tangential_accel_curve = null
	
	# Damping:
	my_m.damping = 0
	my_m.damping_random = 0
	my_m.damping_curve = null
	
	# Angle:
	my_m.angle = 0
	my_m.angle_random = 0
	my_m.angle_curve = null
	
	# Scale:
	my_m.scale = 0.3
	my_m.scale_random = 0.3
	my_m.scale_curve = load("res://new_curvetexture.curvetex")
	
	# Color:
	my_m.color = Color.gray
	
	# Hue Variation:
	my_m.hue_variation = 0.0
	my_m.hue_variation_random = 0
	my_m.hue_variation_curve = null
	
	# Animation:
	my_m.anim_speed = 0
	my_m.anim_speed_random = 0
	my_m.anim_speed_curve = null
	my_m.anim_offset = 0
	my_m.anim_offset_random = 0
	my_m.anim_offset_curve = null
	
	
	
	return my_m

func get_material() -> Material:
	var my_m := CanvasItemMaterial.new()
	my_m.blend_mode = CanvasItemMaterial.BLEND_MODE_ADD
	my_m.light_mode = CanvasItemMaterial.LIGHT_MODE_NORMAL
	my_m.particles_animation = false
#	my_m.particles_anim_h_frames = 3
#	my_m.particles_anim_v_frames = 1
#	my_m.particles_anim_loop = false
	my_m.render_priority = 0
	my_m.next_pass = null
	
	return my_m
	

# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#	pass

● float angle [default: 0.0]
    set_param(value) setter
    get_param() getter

Initial rotation applied to each particle, in degrees.

Only applied when flag_disable_z or flag_rotate_y are true or the SpatialMaterial being used to draw the particle is using SpatialMaterial.BILLBOARD_PARTICLES.

Min: -720
Max: 720

---

● float angle_random [default: 0.0]
    set_param_randomness(value) setter
    get_param_randomness() getter

Rotation randomness ratio.

Min: 0.00
Max: 1.00

● float scale [default: 1.0]
    set_param(value) setter
    get_param() getter

Initial scale applied to each particle.

warning: don't increase this property too much, you might not even be able to see any particle in the screen if you increase it too much.

Min: 0.00
Max: 1000.00

---

● float scale_random [default: 0.0]set_param_randomness(value) setterget_param_randomness() getter

Scale randomness ratio.

Min: 0.00
Max: 1.00

● float hue_variation [default: 0.0]
    set_param(value) setter
    get_param() getter

Initial hue variation applied to each particle.

Min: -1.00
Max: 1.00

---

Important if you have set hue_variation property to a non-zero value

● float hue_variation_random [default: 0.0]
    set_param_randomness(value) setter
    get_param_randomness() getter

Hue variation randomness ratio.

Min: 0.00
Max: 1.00

● float anim_speed [default: 0.0]
    set_param(value) setter
    get_param() getter

Particle animation speed.

Min: 0.00
Max: 128.00

---

● float anim_speed_random [default: 0.0]
    set_param_randomness(value) setter
    get_param_randomness() getter

Animation speed randomness ratio.

Min: 0.00
Max: 1.00

---

● float anim_offset [default: 0.0]
    set_param(value) setter
    get_param() getter

Particle animation offset.

Min: 0.00
Max: 1.00

---

● float anim_offset_random [default: 0.0]
    set_param_randomness(value) setter
    get_param_randomness() getter

Animation offset randomness ratio.

Min: 0.00
Max: 1.00