|
|
| (3 intermediate revisions by the same user not shown) |
| Line 1: |
Line 1: |
| − | {{research|1|Key descriptions are subject to corrections}}
| + | #REDIRECT [[PART (File Format)]] |
| − | The '''PART''' [[Particle Script|particle script]] format is used to configure ''particle effects''.
| + | |
| − | | + | |
| − | Particles are the most widely-used effect in ''Metroid Prime'', with approximately
| + | |
| − | 3,500 unique scripts across the [[PAK_(Metroid_Prime)|PAK archives]].
| + | |
| − | Each script configures a complete ''particle system'' that may draw into the scene.
| + | |
| − | | + | |
| − | The particle system is configurable to generate many visual effects:
| + | |
| − | | + | |
| − | * Flames and smoke
| + | |
| − | * Floating embers
| + | |
| − | * Water splashes/drips
| + | |
| − | * Dust and dirt in windy conditions
| + | |
| − | * Volumetric light "shimmers"
| + | |
| − | * Energy/plasma discharges
| + | |
| − | * Many others
| + | |
| − | | + | |
| − | The concept behind the particle system is quite simple: lots of
| + | |
| − | view-aligned (camera-facing) quads with a texture-image
| + | |
| − | are emitted, positioned, rotated, sized, colored, etc... according to the
| + | |
| − | parameters in the particle script.
| + | |
| − | | + | |
| − | == Particle System ==
| + | |
| − | | + | |
| − | The ''particle system'' ties together all procedures necessary to host an ''emitter''
| + | |
| − | and specifies the rate at which new particles should be created. New particles have a predetermined
| + | |
| − | ''lifetime'' (in frames) set by the system, and the emitter initializes the position and velocity of these particles.
| + | |
| − | The system continuously updates all currently-living particles that it's created. This includes updating
| + | |
| − | properties like ''position'', ''velocity'', ''color'', ''size'' and ''view-rotation''.
| + | |
| − | | + | |
| − | === Child Systems ===
| + | |
| − | | + | |
| − | Particle systems may also host ''child systems'' which are timed and positioned within the parent's reference.
| + | |
| − | Not only does this include other PART systems, but [[SWHC (File Format)|SWHC]] and [[ELSC (File Format)|ELSC]]
| + | |
| − | systems may be parented as well.
| + | |
| − | | + | |
| − | A good example of this is the ''flamethrower's'' system, which composes flame
| + | |
| − | particles with a trailing SWHC and small cinders from a separate PART.
| + | |
| − | | + | |
| − | === Line Mode ===
| + | |
| − | | + | |
| − | When the <code>LINE</code> property is activated, particles are rendered as ''lines'' rather than quads.
| + | |
| − | | + | |
| − | The usual 3D particle position is used as the ''trailing-point'' of the line, with the ''leading-point'' computed
| + | |
| − | via positional-differential, scaled by other parameters. Lines sample textures diagonally as a single-texel strip,
| + | |
| − | allowing for gradients to be applied via spherical or diagonal ramp-textures.
| + | |
| − | | + | |
| − | === Model Mode ===
| + | |
| − | | + | |
| − | When the <code>PMDL</code> property is provided with a [[CMDL (File Format)|CMDL]], particles are rendered
| + | |
| − | using that ''model'', in addition to the quad. Alternatively, <code>PMUS</code> generates a quad transformed
| + | |
| − | as if it were a model (non view aligned).
| + | |
| − | | + | |
| − | Model-based particles have a whole separate suite of properties for controlling local-transformation and color.
| + | |
| − | Most of the properties involving positioning and transforms from the client systems are shared from the
| + | |
| − | normal quad-mode.
| + | |
| − | | + | |
| − | Many weapon effects, notably the "sphere" of the charge-beam, are accomplished using particle models.
| + | |
| − | | + | |
| − | == Particle Instance ==
| + | |
| − | | + | |
| − | For each frame, each particle does the following primary tasks:
| + | |
| − | | + | |
| − | * Determines if particle's lifetime has finished, removing it from the scene and releasing its resources for newly created particles to use
| + | |
| − | * Invokes all [[Particle Script#Mod_Vector_Elements|velocity/position sources]]; advancing position 1/60th of a second
| + | |
| − | * Evaluates local transforms
| + | |
| − | ** Size
| + | |
| − | ** View-aligned rotation
| + | |
| − | ** View-aligned offset
| + | |
| − | * Evaluates particle color (shader-multiplied with texture-image)
| + | |
| − | | + | |
| − | == Emitter ==
| + | |
| − | | + | |
| − | ''Main article: [[Particle Script#Emitter_Elements|Emitter Elements]]''
| + | |
| − | | + | |
| − | Each particle-system employs a single ''emitter'' context.
| + | |
| − | The system generates a specified number of particles each frame;
| + | |
| − | the emitter initializing the position and velocity-vector for each.
| + | |
| − | | + | |
| − | == PART Properties ==
| + | |
| − | | + | |
| − | Particle generator properties are assembled into a [[Particle Script|particle script]]
| + | |
| − | file tagged with <code>GPSM</code>. Any of the following properties are loaded into a
| + | |
| − | ''description'' class for constructing an arbitrary number of ''particle generators''.
| + | |
| − | | + | |
| − | {| class="wikitable"
| + | |
| − | ! FourCC
| + | |
| − | ! Type
| + | |
| − | ! Description
| + | |
| − | ! Scope
| + | |
| − | ! Notes
| + | |
| − | ! MP1
| + | |
| − | ! MP2
| + | |
| − | ! MP3
| + | |
| − | ! DKCR
| + | |
| − | ! DKCTF
| + | |
| − | |-
| + | |
| − | {{ParticlePropertyRow|PSIV|VectorElement|System Initial Velocity|System Init|Defines the initial velocity vector which moves the entire system in local orientation (may be overridden by <code>PSVM</code>)|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
| + | |
| − | {{ParticlePropertyRow|PSVM|ModVectorElement|System Velocity Mod|System Post Particles Update|Mod Vector which influences the position and velocity of the entire system in local space|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
| + | |
| − | {{ParticlePropertyRow|PSOV|VectorElement|System Orientation Velocity|System Post Particles Update|Angular velocity (in degrees/frame) of the system's orientation|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
| + | |
| − | {{ParticlePropertyRow|PSLT|IntElement|System Lifetime|System Init|Count of frames that the system generates new particles|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
| + | |
| − | {{ParticlePropertyRow|PSWT|IntElement|System Warmup Time|System Warmup-Phase Update|Count of frames that the particle system virtually updates itself within one initial frame; exiting the warmup phase afterwards|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
| + | |
| − | {{ParticlePropertyRow|PSTS|RealElement|System Time Scale|System Pre Particles Update|Factor that redefines the second for the system, including the rate at which the system's frame count is incremented. 1.0 is native 60-fps. 0.5 causes every other frame to skip updates, slowing down and making the motion "choppy". 2.0 causes 2 updates every frame, speeding up.|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
| + | |
| − | {{ParticlePropertyRow|POFS|VectorElement|Particle Offset|System Init, System Post Particles Update|Vector that offsets all particles in world-space|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
| + | |
| − | | + | |
| − | |}
| + | |
| − | | + | |
| − | [[Category:File Formats]]
| + | |
| − | [[Category:Metroid Prime]]
| + | |
| − | [[Category:Metroid Prime 2: Echoes]]
| + | |
| − | [[Category:Metroid Prime 3: Corruption]]
| + | |
| − | [[Category:Donkey Kong Country Returns]]
| + | |
