Merge pull request #29768 from cbscribe/kcc_particles_doc

[DOCS] Update CPUParticles[2D] classref

doc/classes/CPUParticles.xml

@@ -1,8 +1,11 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="CPUParticles" inherits="GeometryInstance" category="Core" version="3.2">
 	<brief_description>
+		CPU-based 3D particle emitter.
 	</brief_description>
 	<description>
+		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.
 	</description>
 	<tutorials>
 	</tutorials>
@@ -13,56 +16,77 @@
 			<argument index="0" name="particles" type="Node">
 			</argument>
 			<description>
+				Sets this node's properties to match a given [Particles] node with an assigned [ParticlesMaterial].
 			</description>
 		</method>
 		<method name="restart">
 			<return type="void">
 			</return>
 			<description>
+				Restarts the particle emitter.
 			</description>
 		</method>
 	</methods>
 	<members>
 		<member name="amount" type="int" setter="set_amount" getter="get_amount">
+			Number of particles emitted in one emission cycle.
 		</member>
 		<member name="angle" type="float" setter="set_param" getter="get_param">
+			Initial rotation applied to each particle, in degrees.
 		</member>
 		<member name="angle_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's rotation will be animated along this [Curve].
 		</member>
 		<member name="angle_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Rotation randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="angular_velocity" type="float" setter="set_param" getter="get_param">
+			Initial angular velocity applied to each particle. Sets the speed of rotation of the particle.
 		</member>
 		<member name="angular_velocity_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's angular velocity will vary along this [Curve].
 		</member>
 		<member name="angular_velocity_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Angular velocity randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="anim_offset" type="float" setter="set_param" getter="get_param">
+			Particle animation offset.
 		</member>
 		<member name="anim_offset_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's animation offset will vary along this [Curve].
 		</member>
 		<member name="anim_offset_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Animation offset randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="anim_speed" type="float" setter="set_param" getter="get_param">
+			Particle animation speed.
 		</member>
 		<member name="anim_speed_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's animation speed will vary along this [Curve].
 		</member>
 		<member name="anim_speed_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Animation speed randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="color" type="Color" setter="set_color" getter="get_color">
+			Each particle's initial color. If [member texture] is defined, it will be multiplied by this color.
 		</member>
 		<member name="color_ramp" type="Gradient" setter="set_color_ramp" getter="get_color_ramp">
-			Each particle's vertex color will vary along this [GradientTexture].
+			Each particle's color will vary along this [Gradient].
 		</member>
 		<member name="damping" type="float" setter="set_param" getter="get_param">
+			The rate at which particles lose velocity.
 		</member>
 		<member name="damping_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Damping will vary along this [Curve].
 		</member>
 		<member name="damping_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Damping randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="draw_order" type="int" setter="set_draw_order" getter="get_draw_order" enum="CPUParticles.DrawOrder">
+			Particle draw order. Uses [enum DrawOrder] values. Default value: [constant DRAW_ORDER_INDEX].
 		</member>
 		<member name="emission_box_extents" type="Vector3" setter="set_emission_box_extents" getter="get_emission_box_extents">
+			The rectangle's extents if [member emission_shape] is set to [const EMISSION_SHAPE_BOX].
 		</member>
 		<member name="emission_colors" type="PoolColorArray" setter="set_emission_colors" getter="get_emission_colors">
 		</member>
@@ -71,134 +95,198 @@
 		<member name="emission_points" type="PoolVector3Array" setter="set_emission_points" getter="get_emission_points">
 		</member>
 		<member name="emission_shape" type="int" setter="set_emission_shape" getter="get_emission_shape" enum="CPUParticles.EmissionShape">
+			Particles will be emitted inside this region. Use [enum EmissionShape] for values. Default value: [constant EMISSION_SHAPE_POINT].
 		</member>
 		<member name="emission_sphere_radius" type="float" setter="set_emission_sphere_radius" getter="get_emission_sphere_radius">
+			The sphere's radius if [enum EmissionShape] is set to [constant EMISSION_SHAPE_SPHERE].
 		</member>
 		<member name="emitting" type="bool" setter="set_emitting" getter="is_emitting">
+			If [code]true[/code], particles are being emitted. Default value: [code]true[/code].
 		</member>
 		<member name="explosiveness" type="float" setter="set_explosiveness_ratio" getter="get_explosiveness_ratio">
+			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. Default value: [code]0[/code].
 		</member>
 		<member name="fixed_fps" type="int" setter="set_fixed_fps" getter="get_fixed_fps">
+			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.
 		</member>
 		<member name="flag_align_y" type="bool" setter="set_particle_flag" getter="get_particle_flag">
+			Align y-axis of particle with the direction of its velocity.
 		</member>
 		<member name="flag_disable_z" type="bool" setter="set_particle_flag" getter="get_particle_flag">
+			If [code]true[/code], particles will not move on the z axis. Default value: [code]false[/code].
 		</member>
 		<member name="flag_rotate_y" type="bool" setter="set_particle_flag" getter="get_particle_flag">
+			If [code]true[/code], particles rotate around y-axis by [member angle].
 		</member>
 		<member name="flatness" type="float" setter="set_flatness" getter="get_flatness">
+			Amount of [member spread] in Y/Z plane. A value of [code]1[/code] restricts particles to X/Z plane. Default [code]0[/code].
 		</member>
 		<member name="fract_delta" type="bool" setter="set_fractional_delta" getter="get_fractional_delta">
+			If [code]true[/code], results in fractional delta calculation which has a smoother particles display effect. Default value: [code]true[/code]
 		</member>
 		<member name="gravity" type="Vector3" setter="set_gravity" getter="get_gravity">
+			Gravity applied to every particle. Default value: [code](0, -9.8, 0)[/code].
 		</member>
 		<member name="hue_variation" type="float" setter="set_param" getter="get_param">
+			Initial hue variation applied to each particle.
 		</member>
 		<member name="hue_variation_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's hue will vary along this [Curve].
 		</member>
 		<member name="hue_variation_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Hue variation randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="initial_velocity" type="float" setter="set_param" getter="get_param">
+			Initial velocity magnitude for each particle. Direction comes from [member spread] and the node's orientation.
 		</member>
 		<member name="initial_velocity_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Initial velocity randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="lifetime" type="float" setter="set_lifetime" getter="get_lifetime">
+			Amount of time each particle will exist. Default value: [code]1[/code].
 		</member>
 		<member name="linear_accel" type="float" setter="set_param" getter="get_param">
+			Linear acceleration applied to each particle in the direction of motion.
 		</member>
 		<member name="linear_accel_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's linear acceleration will vary along this [Curve].
 		</member>
 		<member name="linear_accel_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Linear acceleration randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="local_coords" type="bool" setter="set_use_local_coordinates" getter="get_use_local_coordinates">
+			If [code]true[/code], particles use the parent node's coordinate space. If [code]false[/code], they use global coordinates. Default value: [code]true[/code].
 		</member>
 		<member name="mesh" type="Mesh" setter="set_mesh" getter="get_mesh">
+			The [Mesh] used for each particle. If [code]null[/code], particles will be spheres.
 		</member>
 		<member name="one_shot" type="bool" setter="set_one_shot" getter="get_one_shot">
+			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. Default value: [code]false[/code].
 		</member>
 		<member name="orbit_velocity" type="float" setter="set_param" getter="get_param">
+			Orbital velocity applied to each particle. Makes the particles circle around origin. Specified in number of full rotations around origin per second.
 		</member>
 		<member name="orbit_velocity_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's orbital velocity will vary along this [Curve].
 		</member>
 		<member name="orbit_velocity_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Orbital velocity randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="preprocess" type="float" setter="set_pre_process_time" getter="get_pre_process_time">
+			Particle system starts as if it had already run for this many seconds.
 		</member>
 		<member name="radial_accel" type="float" setter="set_param" getter="get_param">
+			Radial acceleration applied to each particle. Makes particle accelerate away from origin.
 		</member>
 		<member name="radial_accel_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's radial acceleration will vary along this [Curve].
 		</member>
 		<member name="radial_accel_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Radial acceleration randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="randomness" type="float" setter="set_randomness_ratio" getter="get_randomness_ratio">
+			Emission lifetime randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="scale_amount" type="float" setter="set_param" getter="get_param">
+			Initial scale applied to each particle.
 		</member>
 		<member name="scale_amount_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's scale will vary along this [Curve].
 		</member>
 		<member name="scale_amount_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Scale randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="speed_scale" type="float" setter="set_speed_scale" getter="get_speed_scale">
+			Particle system's running speed scaling ratio. Default value: [code]1[/code]. A value of [code]0[/code] can be used to pause the particles.
 		</member>
 		<member name="spread" type="float" setter="set_spread" getter="get_spread">
+			Each particle's initial direction range from [code]+spread[/code] to [code]-spread[/code] degrees. Default value: [code]45[/code].
 		</member>
 		<member name="tangential_accel" type="float" setter="set_param" getter="get_param">
+			Tangential acceleration applied to each particle. Tangential acceleration is perpendicular to the particle's velocity giving the particles a swirling motion.
 		</member>
 		<member name="tangential_accel_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's tangential acceleration will vary along this [Curve].
 		</member>
 		<member name="tangential_accel_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Tangential acceleration randomness ratio. Default value: [code]0[/code].
 		</member>
 	</members>
 	<constants>
 		<constant name="DRAW_ORDER_INDEX" value="0" enum="DrawOrder">
+			Particles are drawn in the order emitted.
 		</constant>
 		<constant name="DRAW_ORDER_LIFETIME" value="1" enum="DrawOrder">
+			Particles are drawn in order of remaining lifetime.
 		</constant>
 		<constant name="DRAW_ORDER_VIEW_DEPTH" value="2" enum="DrawOrder">
+			Particles are drawn in order of depth.
 		</constant>
 		<constant name="PARAM_INITIAL_LINEAR_VELOCITY" value="0" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set initial velocity properties.
 		</constant>
 		<constant name="PARAM_ANGULAR_VELOCITY" value="1" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set angular velocity properties.
 		</constant>
 		<constant name="PARAM_ORBIT_VELOCITY" value="2" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set orbital velocity properties.
 		</constant>
 		<constant name="PARAM_LINEAR_ACCEL" value="3" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set linear acceleration properties.
 		</constant>
 		<constant name="PARAM_RADIAL_ACCEL" value="4" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set radial acceleration properties.
 		</constant>
 		<constant name="PARAM_TANGENTIAL_ACCEL" value="5" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set tangential acceleration properties.
 		</constant>
 		<constant name="PARAM_DAMPING" value="6" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set damping properties.
 		</constant>
 		<constant name="PARAM_ANGLE" value="7" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set angle properties.
 		</constant>
 		<constant name="PARAM_SCALE" value="8" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set scale properties.
 		</constant>
 		<constant name="PARAM_HUE_VARIATION" value="9" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set hue variation properties.
 		</constant>
 		<constant name="PARAM_ANIM_SPEED" value="10" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set animation speed properties.
 		</constant>
 		<constant name="PARAM_ANIM_OFFSET" value="11" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set animation offset properties.
 		</constant>
 		<constant name="PARAM_MAX" value="12" enum="Parameter">
+			Represents the size of the [enum Parameter] enum.
 		</constant>
 		<constant name="FLAG_ALIGN_Y_TO_VELOCITY" value="0" enum="Flags">
+			Use with [method set_flag] to set [member flag_align_y].
 		</constant>
 		<constant name="FLAG_ROTATE_Y" value="1" enum="Flags">
+			Use with [method set_flag] to set [member flag_rotate_y].
 		</constant>
 		<constant name="FLAG_DISABLE_Z" value="2" enum="Flags">
+			Use with [method set_flag] to set [member flag_disable_z].
 		</constant>
 		<constant name="FLAG_MAX" value="3" enum="Flags">
+			Represents the size of the [enum Flags] enum.
 		</constant>
 		<constant name="EMISSION_SHAPE_POINT" value="0" enum="EmissionShape">
+			All particles will be emitted from a single point.
 		</constant>
 		<constant name="EMISSION_SHAPE_SPHERE" value="1" enum="EmissionShape">
+			Particles will be emitted in the volume of a sphere.
 		</constant>
 		<constant name="EMISSION_SHAPE_BOX" value="2" enum="EmissionShape">
+			Particles will be emitted in the volume of a box.
 		</constant>
 		<constant name="EMISSION_SHAPE_POINTS" value="3" enum="EmissionShape">
+			Particles will be emitted at a position determined by sampling a random point on the [member emission_point_texture]. Particle color will be modulated by [member emission_color_texture].
 		</constant>
 		<constant name="EMISSION_SHAPE_DIRECTED_POINTS" value="4" enum="EmissionShape">
+			Particles will be emitted at a position determined by sampling a random point on the [member emission_point_texture]. Particle velocity and rotation will be set based on [member emission_normal_texture]. Particle color will be modulated by [member emission_color_texture].
 		</constant>
 	</constants>
 </class>

doc/classes/CPUParticles2D.xml

@@ -1,10 +1,14 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="CPUParticles2D" inherits="Node2D" category="Core" version="3.2">
 	<brief_description>
+		CPU-based 2D particle emitter.
 	</brief_description>
 	<description>
+		CPU-based 2D particle node used to create a variety of particle systems and effects.
+		See also [Particles2D], which provides the same functionality with hardware acceleration, but may not run on older devices.
 	</description>
 	<tutorials>
+		<link>https://docs.godotengine.org/en/latest/tutorials/2d/particle_systems_2d.html</link>
 	</tutorials>
 	<methods>
 		<method name="convert_from_particles">
@@ -13,53 +17,74 @@
 			<argument index="0" name="particles" type="Node">
 			</argument>
 			<description>
+				Sets this node's properties to match a given [Particles2D] node with an assigned [ParticlesMaterial].
 			</description>
 		</method>
 		<method name="restart">
 			<return type="void">
 			</return>
 			<description>
+				Restarts the particle emitter.
 			</description>
 		</method>
 	</methods>
 	<members>
 		<member name="amount" type="int" setter="set_amount" getter="get_amount">
+			Number of particles emitted in one emission cycle.
 		</member>
 		<member name="angle" type="float" setter="set_param" getter="get_param">
+			Initial rotation applied to each particle, in degrees.
 		</member>
 		<member name="angle_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's rotation will be animated along this [Curve].
 		</member>
 		<member name="angle_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Rotation randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="angular_velocity" type="float" setter="set_param" getter="get_param">
+			Initial angular velocity applied to each particle. Sets the speed of rotation of the particle.
 		</member>
 		<member name="angular_velocity_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's angular velocity will vary along this [Curve].
 		</member>
 		<member name="angular_velocity_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Angular velocity randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="anim_offset" type="float" setter="set_param" getter="get_param">
+			Particle animation offset.
 		</member>
 		<member name="anim_offset_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's animation offset will vary along this [Curve].
 		</member>
 		<member name="anim_offset_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Animation offset randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="anim_speed" type="float" setter="set_param" getter="get_param">
+			Particle animation speed.
 		</member>
 		<member name="anim_speed_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's animation speed will vary along this [Curve].
 		</member>
 		<member name="anim_speed_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Animation speed randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="color" type="Color" setter="set_color" getter="get_color">
+			Each particle's initial color. If [member texture] is defined, it will be multiplied by this color.
 		</member>
 		<member name="color_ramp" type="Gradient" setter="set_color_ramp" getter="get_color_ramp">
+			Each particle's color will vary along this [Gradient].
 		</member>
 		<member name="damping" type="float" setter="set_param" getter="get_param">
+			The rate at which particles lose velocity.
 		</member>
 		<member name="damping_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Damping will vary along this [Curve].
 		</member>
 		<member name="damping_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Damping randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="draw_order" type="int" setter="set_draw_order" getter="get_draw_order" enum="CPUParticles2D.DrawOrder">
+			Particle draw order. Uses [enum DrawOrder] values. Default value: [constant DRAW_ORDER_INDEX].
 		</member>
 		<member name="emission_colors" type="PoolColorArray" setter="set_emission_colors" getter="get_emission_colors">
 		</member>
@@ -68,132 +93,194 @@
 		<member name="emission_points" type="PoolVector2Array" setter="set_emission_points" getter="get_emission_points">
 		</member>
 		<member name="emission_rect_extents" type="Vector2" setter="set_emission_rect_extents" getter="get_emission_rect_extents">
+			The rectangle's extents if [member emission_shape] is set to [const EMISSION_SHAPE_RECTANGLE].
 		</member>
 		<member name="emission_shape" type="int" setter="set_emission_shape" getter="get_emission_shape" enum="CPUParticles2D.EmissionShape">
+			Particles will be emitted inside this region. Use [enum EmissionShape] for values. Default value: [constant EMISSION_SHAPE_POINT].
 		</member>
 		<member name="emission_sphere_radius" type="float" setter="set_emission_sphere_radius" getter="get_emission_sphere_radius">
+			The circle's radius if [member emission_shape] is set to [const EMISSION_SHAPE_CIRCLE].
 		</member>
 		<member name="emitting" type="bool" setter="set_emitting" getter="is_emitting">
+			If [code]true[/code], particles are being emitted. Default value: [code]true[/code].
 		</member>
 		<member name="explosiveness" type="float" setter="set_explosiveness_ratio" getter="get_explosiveness_ratio">
+			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. Default value: [code]0[/code].
 		</member>
 		<member name="fixed_fps" type="int" setter="set_fixed_fps" getter="get_fixed_fps">
+			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 simulation of the particle system itself.
 		</member>
 		<member name="flag_align_y" type="bool" setter="set_particle_flag" getter="get_particle_flag">
+			Align y-axis of particle with the direction of its velocity.
 		</member>
 		<member name="flatness" type="float" setter="set_flatness" getter="get_flatness">
 		</member>
 		<member name="fract_delta" type="bool" setter="set_fractional_delta" getter="get_fractional_delta">
+			If [code]true[/code], results in fractional delta calculation which has a smoother particles display effect. Default value: [code]true[/code]
 		</member>
 		<member name="gravity" type="Vector2" setter="set_gravity" getter="get_gravity">
+			Gravity applied to every particle. Default value: [code](0, 98)[/code].
 		</member>
 		<member name="hue_variation" type="float" setter="set_param" getter="get_param">
+			Initial hue variation applied to each particle.
 		</member>
 		<member name="hue_variation_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's hue will vary along this [Curve].
 		</member>
 		<member name="hue_variation_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Hue variation randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="initial_velocity" type="float" setter="set_param" getter="get_param">
+			Initial velocity magnitude for each particle. Direction comes from [member spread] and the node's orientation.
 		</member>
 		<member name="initial_velocity_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Initial velocity randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="lifetime" type="float" setter="set_lifetime" getter="get_lifetime">
+			Amount of time each particle will exist. Default value: [code]1[/code].
 		</member>
 		<member name="linear_accel" type="float" setter="set_param" getter="get_param">
+			Linear acceleration applied to each particle in the direction of motion.
 		</member>
 		<member name="linear_accel_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's linear acceleration will vary along this [Curve].
 		</member>
 		<member name="linear_accel_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Linear acceleration randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="local_coords" type="bool" setter="set_use_local_coordinates" getter="get_use_local_coordinates">
+			If [code]true[/code], particles use the parent node's coordinate space. If [code]false[/code], they use global coordinates. Default value: [code]true[/code].
 		</member>
 		<member name="normalmap" type="Texture" setter="set_normalmap" getter="get_normalmap">
+			Normal map to be used for the [member texture] property.
 		</member>
 		<member name="one_shot" type="bool" setter="set_one_shot" getter="get_one_shot">
+			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. Default value: [code]false[/code].
 		</member>
 		<member name="orbit_velocity" type="float" setter="set_param" getter="get_param">
+			Orbital velocity applied to each particle. Makes the particles circle around origin. Specified in number of full rotations around origin per second.
 		</member>
 		<member name="orbit_velocity_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's orbital velocity will vary along this [Curve].
 		</member>
 		<member name="orbit_velocity_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Orbital velocity randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="preprocess" type="float" setter="set_pre_process_time" getter="get_pre_process_time">
+			Particle system starts as if it had already run for this many seconds.
 		</member>
 		<member name="radial_accel" type="float" setter="set_param" getter="get_param">
+			Radial acceleration applied to each particle. Makes particle accelerate away from origin.
 		</member>
 		<member name="radial_accel_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's radial acceleration will vary along this [Curve].
 		</member>
 		<member name="radial_accel_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Radial acceleration randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="randomness" type="float" setter="set_randomness_ratio" getter="get_randomness_ratio">
+			Emission lifetime randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="scale_amount" type="float" setter="set_param" getter="get_param">
+			Initial scale applied to each particle.
 		</member>
 		<member name="scale_amount_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's scale will vary along this [Curve].
 		</member>
 		<member name="scale_amount_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Scale randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="speed_scale" type="float" setter="set_speed_scale" getter="get_speed_scale">
+			Particle system's running speed scaling ratio. Default value: [code]1[/code]. A value of [code]0[/code] can be used to pause the particles.
 		</member>
 		<member name="spread" type="float" setter="set_spread" getter="get_spread">
+			Each particle's initial direction range from [code]+spread[/code] to [code]-spread[/code] degrees. Default value: [code]45[/code].
 		</member>
 		<member name="tangential_accel" type="float" setter="set_param" getter="get_param">
+			Tangential acceleration applied to each particle. Tangential acceleration is perpendicular to the particle's velocity giving the particles a swirling motion.
 		</member>
 		<member name="tangential_accel_curve" type="Curve" setter="set_param_curve" getter="get_param_curve">
+			Each particle's tangential acceleration will vary along this [Curve].
 		</member>
 		<member name="tangential_accel_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
+			Tangential acceleration randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="texture" type="Texture" setter="set_texture" getter="get_texture">
+			Particle texture. If [code]null[/code] particles will be squares.
 		</member>
 	</members>
 	<constants>
 		<constant name="DRAW_ORDER_INDEX" value="0" enum="DrawOrder">
+			Particles are drawn in the order emitted.
 		</constant>
 		<constant name="DRAW_ORDER_LIFETIME" value="1" enum="DrawOrder">
-		</constant>
+			Particles are drawn in order of remaining lifetime.
+		</constant
 		<constant name="PARAM_INITIAL_LINEAR_VELOCITY" value="0" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set initial velocity properties.
 		</constant>
 		<constant name="PARAM_ANGULAR_VELOCITY" value="1" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set angular velocity properties.
 		</constant>
 		<constant name="PARAM_ORBIT_VELOCITY" value="2" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set orbital velocity properties.
 		</constant>
 		<constant name="PARAM_LINEAR_ACCEL" value="3" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set linear acceleration properties.
 		</constant>
 		<constant name="PARAM_RADIAL_ACCEL" value="4" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set radial acceleration properties.
 		</constant>
 		<constant name="PARAM_TANGENTIAL_ACCEL" value="5" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set tangential acceleration properties.
 		</constant>
 		<constant name="PARAM_DAMPING" value="6" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set damping properties.
 		</constant>
 		<constant name="PARAM_ANGLE" value="7" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set angle properties.
 		</constant>
 		<constant name="PARAM_SCALE" value="8" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set scale properties.
 		</constant>
 		<constant name="PARAM_HUE_VARIATION" value="9" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set hue variation properties.
 		</constant>
 		<constant name="PARAM_ANIM_SPEED" value="10" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set animation speed properties.
 		</constant>
 		<constant name="PARAM_ANIM_OFFSET" value="11" enum="Parameter">
+			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set animation offset properties.
 		</constant>
 		<constant name="PARAM_MAX" value="12" enum="Parameter">
+			Represents the size of the [enum Parameter] enum.
 		</constant>
 		<constant name="FLAG_ALIGN_Y_TO_VELOCITY" value="0" enum="Flags">
+			Use with [method set_flag] to set [member flag_align_y].
 		</constant>
 		<constant name="FLAG_ROTATE_Y" value="1" enum="Flags">
+			Use with [method set_flag] to set [member flag_rotate_y]. Present for consistency with 3D particle nodes, not used in 2D.
 		</constant>
 		<constant name="FLAG_DISABLE_Z" value="2" enum="Flags">
+			Use with [method set_flag] to set [member flag_disable_z].  Present for consistency with 3D particle nodes, not used in 2D.
 		</constant>
 		<constant name="FLAG_MAX" value="3" enum="Flags">
+			Represents the size of the [enum Flags] enum.
 		</constant>
 		<constant name="EMISSION_SHAPE_POINT" value="0" enum="EmissionShape">
+			All particles will be emitted from a single point.
 		</constant>
 		<constant name="EMISSION_SHAPE_CIRCLE" value="1" enum="EmissionShape">
+			Particles will be emitted on the perimeter of a circle.
 		</constant>
 		<constant name="EMISSION_SHAPE_RECTANGLE" value="2" enum="EmissionShape">
+			Particles will be emitted in the area of a rectangle.
 		</constant>
 		<constant name="EMISSION_SHAPE_POINTS" value="3" enum="EmissionShape">
+			Particles will be emitted at a position determined by sampling a random point on the [member emission_point_texture]. Particle color will be modulated by [member emission_color_texture].
 		</constant>
 		<constant name="EMISSION_SHAPE_DIRECTED_POINTS" value="4" enum="EmissionShape">
+			Particles will be emitted at a position determined by sampling a random point on the [member emission_point_texture]. Particle velocity and rotation will be set based on [member emission_normal_texture]. Particle color will be modulated by [member emission_color_texture].
 		</constant>
 	</constants>
 </class>

doc/classes/Particles.xml

@@ -55,8 +55,10 @@
 			Time ratio between each emission. If [code]0[/code] particles are emitted continuously. If [code]1[/code] all particles are emitted simultaneously. Default value: [code]0[/code].
 		</member>
 		<member name="fixed_fps" type="int" setter="set_fixed_fps" getter="get_fixed_fps">
+			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 simulation of the particle system itself.
 		</member>
 		<member name="fract_delta" type="bool" setter="set_fractional_delta" getter="get_fractional_delta">
+			If [code]true[/code], results in fractional delta calculation which has a smoother particles display effect. Default value: [code]true[/code].
 		</member>
 		<member name="lifetime" type="float" setter="set_lifetime" getter="get_lifetime">
 			Amount of time each particle will exist. Default value: [code]1[/code].

doc/classes/Particles2D.xml

@@ -40,7 +40,7 @@
 			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. Default value: [code]0[/code].
 		</member>
 		<member name="fixed_fps" type="int" setter="set_fixed_fps" getter="get_fixed_fps">
-			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.
+			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 simulation of the particle system itself.
 		</member>
 		<member name="fract_delta" type="bool" setter="set_fractional_delta" getter="get_fractional_delta">
 			If [code]true[/code], results in fractional delta calculation which has a smoother particles display effect. Default value: [code]true[/code]
@@ -52,7 +52,7 @@
 			If [code]true[/code], particles use the parent node's coordinate space. If [code]false[/code], they use global coordinates. Default value: [code]true[/code].
 		</member>
 		<member name="normal_map" type="Texture" setter="set_normal_map" getter="get_normal_map">
-			Normal map to be used for the [code]texture[/code] property.
+			Normal map to be used for the [member texture] property.
 		</member>
 		<member name="one_shot" type="bool" setter="set_one_shot" getter="get_one_shot">
 			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. Default value: [code]false[/code].

doc/classes/ParticlesMaterial.xml

@@ -100,7 +100,7 @@
 			Amount of [member spread] in Y/Z plane. A value of [code]1[/code] restricts particles to X/Z plane. Default [code]0[/code].
 		</member>
 		<member name="gravity" type="Vector3" setter="set_gravity" getter="get_gravity">
-			Gravity applied to every particle. Default value: [code](0, 98, 0)[/code].
+			Gravity applied to every particle. Default value: [code](0, -9.8, 0)[/code].
 		</member>
 		<member name="hue_variation" type="float" setter="set_param" getter="get_param">
 			Initial hue variation applied to each particle.
@@ -112,13 +112,13 @@
 			Hue variation randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="initial_velocity" type="float" setter="set_param" getter="get_param">
-			Initial velocity magnitude for each particle. Direction comes from [member spread].
+			Initial velocity magnitude for each particle. Direction comes from [member spread] and the node's orientation.
 		</member>
 		<member name="initial_velocity_random" type="float" setter="set_param_randomness" getter="get_param_randomness">
 			Initial velocity randomness ratio. Default value: [code]0[/code].
 		</member>
 		<member name="linear_accel" type="float" setter="set_param" getter="get_param">
-			Linear acceleration applied to each particle. Acceleration increases velocity magnitude each frame without affecting direction.
+			Linear acceleration applied to each particle in the direction of motion.
 		</member>
 		<member name="linear_accel_curve" type="Texture" setter="set_param_texture" getter="get_param_texture">
 			Each particle's linear acceleration will vary along this [CurveTexture].
@@ -184,7 +184,7 @@
 			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set angular velocity properties.
 		</constant>
 		<constant name="PARAM_ORBIT_VELOCITY" value="2" enum="Parameter">
-			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 orbital velocity properties.
 		</constant>
 		<constant name="PARAM_LINEAR_ACCEL" value="3" enum="Parameter">
 			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set linear acceleration properties.
@@ -205,7 +205,7 @@
 			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set scale properties.
 		</constant>
 		<constant name="PARAM_HUE_VARIATION" value="9" enum="Parameter">
-			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 hue variation properties.
 		</constant>
 		<constant name="PARAM_ANIM_SPEED" value="10" enum="Parameter">
 			Use with [method set_param], [method set_param_randomness], and [method set_param_texture] to set animation speed properties.