Changes between Initial Version and Version 1 of ~archive/ParticleEngine

Timestamp:

Nov 27, 2007, 10:35:36 PM (18 years ago)

Author:

landauf

Comment:

—

~archive/ParticleEngine

@@ +1 @@
+= ParticleEngine =
+Particles are an easy to use, fast and efficient way to produce many different volumetric effects like
+  * snow
+  * dust
+  * smoke
+  * fire
+  * commets
+  * and much more
+normally they are quite tiny objects, that follow some laws like velocity, forces and so on...
+
+== properties ==
+each particle has some properties that are given to it by its ParticleSystem.
+those are:
+{{{
+#!cpp
+  float         lifeTime;            //!< The time this particle has to live.
+  float         lifeCycle;           //!< The fraction of time passed. (in percentage of its lifeTime)
+
+  Vector        position;            //!< The current position of this particle.
+  Vector        velocity;            //!< The current velocity of this particle.
+  Vector        extForce;            //!< The external Force that influences this Particle.
+  Quaternion    rotation;            //!< The current rotation of this particle.
+  float         mass;                //!< The mass of this particle.
+  float         massRand;            //!< A random mass
+  float         radius;              //!< The current size of this particle.
+  float         radiusRand;          //!< a random Radius
+  GLfloat       color [4];           //!< A Color for the particles.
+}}}
+through the ParticleSystem, they are all animatable.
+(if you are interested in more detail how you can animate this stuff visit: [http://www.orxonox.ethz.ch/trunk/doc/html/annotated.html this] and goto ParticleSystem.
+
+== How It Works ==
+https://www.orxonox.net/additionals/ParticleEngine.png
+
+__GENERAL IDEA__
+
+The Diagram above shows how the flow of the ParticleEngine works.
+  1. The driver(world.cc) tells the ParticleEngine what to do (either tick or draw)
+  2. The ParticleEngine tells the ParticleEmitter's to emitt into their ParticleSystem's
+  3. The ParticleEngine telss the ParticleSystem's to tick themselves.
+    moves/iterates/removes particles
+  4. The ParticleEngine tells the ParticleSystem's to draw themselves
+
+__IN ORXONOX__
+  1. All the ParticleSystems are WorldEntitites and as such are drawn within the internal engine. So our framework acts as ParticleEngine
+  2. Emitters have one/or no ParticleSystem in which they emit into. The ParticleSystems tell them to emit
+  3. Systems have multiple emitters, and they are tickt and drawn in ORXONOX OM_ENVIRON_TICK (see ObjectManager)
+
+== Creation ==
+  1. hardcoded
+{{{
+#!cpp
+/* create a ParticleSystem */
+ParticleSystem* system = new SpriteParticles(100000);
+/* create a ParticleEmitter */
+ParticleEmitter* emitter = new ParticleEmitter(Vector(-1, 0, 0), M_PI_4, 400, .5);
+/* let the emitter emit into system */
+emitter->setSystem(system)
+// or
+system->addEmitter(emitter);
+
+}}}
+  2. lodeable
+   this is the easiest version see the LoadParam page for more information on howto do this
+
+you could also use one of the many functions, to let the Particles look better, but this is for you to decide.