SurfaceEmitter
SurfaceEmitter generates particles from the surface of an object. New particles are generated by first randomly choosing a face on the tessellated geometry and then a random position on that face. Particles are generated with an initial direction of the normal to that point (including any normal averaging due to normalPerVertex and creaseAngle field settings).
The SurfaceEmitter node belongs to the ParticleSystems component and its container field is emitter. It is available since X3D version 3.2 or later.
Fields
SFNode [in, out] metadata NULL [X3DMetadataObject]
Metadata are not part of the X3D world and not interpreted by the X3D browser, but they can be accessed via the ECMAScript interface.
SFFloat [in, out] speed [0,∞)
Initial linear speed (default is m/s) imparted to all particles along their direction of movement.
SFFloat [in, out] variation 0.25 [0,∞)
Multiplier for the randomness used to control the range of possible output values. The bigger the value, the more random the output and the bigger the range of possible initial values possible.
Hint
Variation of zero does not allow any randomness.
SFFloat [ ] mass [0,∞)
Basic mass of each particle in mass base units (default is grams).
Hint
Mass is needed if gravity or other force-related calculations are performed per-particle.
SFFloat [ ] surfaceArea [0,∞)
Particle surface area in area base units (default is meters squared). Surface area is used for calculations such as wind effects per particle.
Hints
SurfaceArea value represents average frontal area presented to the wind. Assumes spherical model for each particle (i.e., surface area is the same regardless of direction).
SFNode [ ] surface NULL [X3DGeometryNode]
The geometry node provides geometry used as the emitting surface.
Hint
If the surface is indicated as not being solid (solid field set to false), randomly choose from which side of the surface to emit, negating the normal direction when generating from the back side.
Warning
Only valid geometry shall be used.
Example
XML Encoding
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Classic Encoding
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#X3D V3.3 utf8 Titania V4.0.6 PROFILE Full META "comment" "World of Titania" META "created" "Sun, 03 Dec 2017 04:29:28 GMT" META "creator" "Holger Seelig" META "generator" "Titania V4.0.2, http://titania.create3000.de" META "identifier" "file:///home/holger/Projekte/Server/create3000.de/media/htdocs/components/Layering/Viewport/Viewport.O.x3d" META "modified" "Sun, 03 Dec 2017 05:32:31 GMT" META "titania-add-metadata" "true" WorldInfo { } LayerSet { order [ 1, 2, 3, 4 ] layers [ DEF Background Layer { isPickable FALSE children DEF White Background { skyColor 1 1 1 } } DEF Stars LayoutLayer { isPickable FALSE layout Layout { } viewport DEF _1 Viewport { clipBoundary [ 0, 1, 0.177, 0.822 ] } children [ DEF Gray_2 Background { skyColor 0.2 0.2 0.2 } DEF stars Transform { children Shape { appearance Appearance { texture ImageTexture { url "stars.png" repeatS FALSE repeatT FALSE } } geometry Rectangle2D { size 1 1 } } } ] } DEF Particles Layer { isPickable FALSE viewport USE _1 children [ DEF Surface Transform { children Shape { appearance Appearance { material Material { transparency 1 } } geometry DEF _3 IndexedFaceSet { coordIndex [ 3, 2, 1, 0, -1 ] coord Coordinate { point [ -13.4377 2.82143 5.06955, 13.4373 2.82144 5.06957, 13.4378 2.82144 -20.9484, -13.4371 2.82143 -20.9484 ] } } } } ParticleSystem { maxParticles 50 particleLifetime 10 particleSize 0.2 0.2 emitter SurfaceEmitter { speed 0.5 surface USE _3 } appearance Appearance { texture ImageTexture { url "star.png" } } } ] } LayoutLayer { isPickable FALSE children [ DEF Text Transform { children Shape { appearance Appearance { material Material { } } geometry Text { string "CREATE MORE PARTICLES" solid TRUE fontStyle FontStyle { family "Sari-Light.otf" size 0.2 justify "MIDDLE" } } } } DEF Text_4 Transform { translation 0 -0.269567 0 children Shape { appearance Appearance { material Material { } } geometry Text { string "WITH X_ITE" solid TRUE fontStyle FontStyle { family "Sari-Medium.otf" size 0.24 justify "MIDDLE" } } } } ] } ] } |
JSON Encoding
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Titania
X_ITE