2D particle node used to create a variety of particle systems and effects. [GPUParticles2D] features an emitter that generates some number of particles at a given rate.
Use the [member process_material] property to add a [ParticleProcessMaterial] to configure particle appearance and behavior. Alternatively, you can add a [ShaderMaterial] which will be applied to all particles.
Emits a single particle. Whether [param xform], [param velocity], [param color] and [param custom] are applied depends on the value of [param flags]. See [enum EmitFlags].
The ratio of particles that should actually be emitted. If set to a value lower than [code]1.0[/code], this will set the amount of emitted particles throughout the lifetime to [code]amount * amount_ratio[/code]. Unlike changing [member amount], changing [member amount_ratio] while emitting does not affect already-emitted particles and doesn't cause the particle system to restart. [member amount_ratio] can be used to create effects that make the number of emitted particles vary over time.
[b]Note:[/b] Reducing the [member amount_ratio] has no performance benefit, since resources need to be allocated and processed for the total [member amount] of particles regardless of the [member amount_ratio].
If [code]true[/code], particles are being emitted. [member emitting] can be used to start and stop particles from emitting. However, if [member one_shot] is [code]true[/code] setting [member emitting] to [code]true[/code] will not restart the emission cycle until after all active particles finish processing. You can use the [signal finished] signal to be notified once all active particles finish processing.
The particle system's frame rate is fixed to a value. For example, 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.
If [code]true[/code], particles use the parent node's coordinate space (known as local coordinates). This will cause particles to move and rotate along the [GPUParticles2D] node (and its parents) when it is moved or rotated. If [code]false[/code], particles use global coordinates; they will not move or rotate along the [GPUParticles2D] node (and its parents) when it is moved or rotated.
If [code]true[/code], enables particle trails using a mesh skinning system.
[b]Note:[/b] Unlike [GPUParticles3D], the number of trail sections and subdivisions is set with the [member trail_sections] and [member trail_section_subdivisions] properties.
The number of subdivisions to use for the particle trail rendering. Higher values can result in smoother trail curves, at the cost of performance due to increased mesh complexity. See also [member trail_sections]. Only effective if [member trail_enabled] is [code]true[/code].
The number of sections to use for the particle trail rendering. Higher values can result in smoother trail curves, at the cost of performance due to increased mesh complexity. See also [member trail_section_subdivisions]. Only effective if [member trail_enabled] is [code]true[/code].
The [Rect2] that determines the node's region which needs to be visible on screen for the particle system to be active.
Grow the rect if particles suddenly appear/disappear when the node enters/exits the screen. The [Rect2] can be grown via code or with the [b]Particles → Generate Visibility Rect[/b] editor tool.
Emitted when all active particles have finished processing. When [member one_shot] is disabled, particles will process continuously, so this is never emitted.
[b]Note:[/b] Due to the particles being computed on the GPU there might be a delay before the signal gets emitted.
