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Implemented tools around particles seed randomization.

Browse source 
The purpose of this code is to expose the necessary
functions for users and engine devs to develop tooling
for properly timing and seeking inside particles.

Co-authored-by: Hugo Locurcio <hugo.locurcio@hugo.pro>
Co-authored-by: A Thousand Ships <96648715+AThousandShips@users.noreply.github.com>
Co-authored-by: Tomasz Chabora <kobewi4e@gmail.com>
Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>
This commit is contained in:
QbieShay 2024-05-18 18:13:57 +02:00 • committed by Qbieshay
parent bdf625bd54
commit e9eb0b6082
27 changed files with 653 additions and 108 deletions
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16
doc/classes/GPUParticles3D.xml
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@ -46,11 +46,21 @@
Returns the [Mesh] that is drawn at index [param pass].
</description>
</method>
<method name="request_particles_process">
<return type="void" />
<param index="0" name="process_time" type="float" />
<description>
Requests the particles to process for extra process time during a single frame.
Useful for particle playback, if used in combination with [member use_fixed_seed] or by calling [method restart] with parameter [code]keep_seed[/code] set to [code]true[/code].
</description>
</method>
<method name="restart">
<return type="void" />
<param index="0" name="keep_seed" type="bool" default="false" />
<description>
Restarts the particle emission cycle, clearing existing particles. To avoid particles vanishing from the viewport, wait for the [signal finished] signal before calling.
[b]Note:[/b] The [signal finished] signal is only emitted by [member one_shot] emitters.
If [param keep_seed] is [code]true[/code], the current random seed will be preserved. Useful for seeking and playback.
</description>
</method>
<method name="set_draw_pass_mesh">
@ -136,6 +146,9 @@
<member name="randomness" type="float" setter="set_randomness_ratio" getter="get_randomness_ratio" default="0.0">
Emission randomness ratio.
</member>
<member name="seed" type="int" setter="set_seed" getter="get_seed" default="0">
Sets the random seed used by the particle system. Only effective if [member use_fixed_seed] is [code]true[/code].
</member>
<member name="speed_scale" type="float" setter="set_speed_scale" getter="get_speed_scale" default="1.0">
Speed scaling ratio. A value of [code]0[/code] can be used to pause the particles.
</member>
@ -153,6 +166,9 @@
</member>
<member name="transform_align" type="int" setter="set_transform_align" getter="get_transform_align" enum="GPUParticles3D.TransformAlign" default="0">
</member>
<member name="use_fixed_seed" type="bool" setter="set_use_fixed_seed" getter="get_use_fixed_seed" default="false">
If [code]true[/code], particles will use the same seed for every simulation using the seed defined in [member seed]. This is useful for situations where the visual outcome should be consistent across replays, for example when using Movie Maker mode.
</member>
<member name="visibility_aabb" type="AABB" setter="set_visibility_aabb" getter="get_visibility_aabb" default="AABB(-4, -4, -4, 8, 8, 8)">
The [AABB] that determines the node's region which needs to be visible on screen for the particle system to be active. [member GeometryInstance3D.extra_cull_margin] is added on each of the AABB's axes. Particle collisions and attraction will only occur within this area.
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]Particles → Generate AABB[/b] editor tool.