3D particle node used to create a variety of particle systems and effects. [GPUParticles] features an emitter that generates some number of particles at a given rate.
Use the [code]process_material[/code] property to add a [ParticlesMaterial] to configure particle appearance and behavior. Alternatively, you can add a [ShaderMaterial] which will be applied to all particles.
[b]Note:[/b] [GPUParticles] only work when using the GLES3 renderer. If using the GLES2 renderer, use [CPUParticles] instead. You can convert [GPUParticles] to [CPUParticles] by selecting the node, clicking the [b]GPUParticles[/b] menu at the top of the 3D editor viewport then choosing [b]Convert to CPUParticles[/b].
[b]Note:[/b] On macOS, [GPUParticles] rendering is much slower than [CPUParticles] due to transform feedback being implemented on the CPU instead of the GPU. Consider using [CPUParticles] instead when targeting macOS.
[b]Note:[/b] After working on a GPUParticles node, remember to update its [member visibility_aabb] by selecting it, clicking the [b]GPUParticles[/b] menu at the top of the 3D editor viewport then choose [b]Generate Visibility AABB[/b]. Otherwise, particles may suddenly disappear depending on the camera position and angle.
<linktitle="Controlling thousands of fish with GPUParticles">$DOCS_URL/tutorials/performance/vertex_animation/controlling_thousands_of_fish.html</link>
The number of particles emitted in one emission cycle (corresponding to the [member lifetime]).
[b]Note:[/b] Changing [member amount] will reset the particle emission, therefore removing all particles that were already emitted before changing [member amount].
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.
Grow the box if particles suddenly appear/disappear when the node enters/exits the screen. The [AABB] can be grown via code or with the [b]GPUParticles → Generate AABB[/b] editor tool.
[b]Note:[/b] If the [ParticlesMaterial] in use is configured to cast shadows, you may want to enlarge this AABB to ensure the shadow is updated when particles are off-screen.
</member>
</members>
<signals>
<signalname="finished">
<description>
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.
