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particles [2019/10/01 11:13] – [Smoke effect with wind influencer] adminparticles [2020/11/06 14:04] – admin
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 ====== Using the ParticleSystem ====== ====== Using the ParticleSystem ======
 +
 +{{::particles1.jpg?nolink|}}
  
 Gorilla3D provides an integrated particle system for rendering complex and individual particle effects. Gorilla3D provides an integrated particle system for rendering complex and individual particle effects.
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 Gorilla3D already supplies some of the most popular effects, like: fire, smoke, rain, snow, waterfall, eruption, explosion. Gorilla3D already supplies some of the most popular effects, like: fire, smoke, rain, snow, waterfall, eruption, explosion.
  
 +{{::particles2.jpg?nolink|}}
  
 It is possible to manipulate each particle by the so-called influencers. It is possible to manipulate each particle by the so-called influencers.
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   * Endless or limited emmittance   * Endless or limited emmittance
   * Physically based particle collision detection with other scene objects (not with particles!)   * Physically based particle collision detection with other scene objects (not with particles!)
 +  * Autosorting of particles depending on assigned camera
  
 ===== Shader / Material ===== ===== Shader / Material =====
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 | a_Binormal | X = size, Y = angle, Z = weight | | a_Binormal | X = size, Y = angle, Z = weight |
 | a_Tangent | X = age, Y = life time, Z = delta time | | a_Tangent | X = age, Y = life time, Z = delta time |
 +===== Influencers =====
 +
 +Influencers are helper classes to manipulate particles at runtime.
 +
 +===== Physics Particle Support =====
 +
 +{{::particles3.jpg?nolink|}}
 +
 +Our particles system can be linked to the physics system for particle collision detection.
 +In the following example we use the rain particle emitter as basis.
 +
 +<file pascal>
 +uses
 +  [...]
 +  Gorilla.Material.Particle,
 +  Gorilla.Particle.Emitter,
 +  Gorilla.Particle.Influencer,
 +  Gorilla.Particle.Rain,
 +  Gorilla.Particle.Spot,
 +  Gorilla.Physics,
 +  Gorilla.Physics.Q3.Body;
 +  
 +TForm1 = class(TForm)
 +  procedure FormCreate(Sender: TObject);
 +  protected
 +    FViewport : TGorillaViewport;
 +    FCamera : TGorillaCamera;
 +    FPhysics : TGorillaPhysicsSystem;
 +    FParticles : TGorillaRainParticleEmitter;
 +    FInfluencer : TGorillaPhysicsInfluencer;
 +    FSplashes : TGorillaSpotParticleEmitter;
 +    
 +    procedure DoOnGorillaPhysicsNotifyContact(const ABodyA, ABodyB : TQ3Body);
 +  [...]
 +end;
 +
 +[...]
 +
 +procedure TForm1.DoOnGorillaPhysicsNotifyContact(const ABodyA, ABodyB : TQ3Body);
 +begin
 +  // collision detected - create splashes on particle-sphere/box/terrain/mesh collision
 +  // not on particle-particle collision (too much)
 +  if (PTypeInfo(ABodyA.UserDataType) = TypeInfo(PGorillaParticle))
 +  and (PTypeInfo(ABodyB.UserDataType) = TypeInfo(PGorillaParticle)) then
 +    Exit;
 +
 +  if (PTypeInfo(ABodyA.UserDataType) = TypeInfo(PGorillaParticle)) then
 +    FSplashes.EmitParticle(
 +      PGorillaParticle(ABodyA.UserData)^.Position
 +      )
 +  else if (PTypeInfo(ABodyB.UserDataType) = TypeInfo(PGorillaParticle)) then
 +    FSplashes.EmitParticle(
 +      PGorillaParticle(ABodyB.UserData)^.Position
 +      );
 +end;
 +
 +procedure TForm1.FormCreate(Sender: TObject);
 +begin
 +  [...]
 +  
 +  // create physics system with contact callback function to display splashes
 +  FPhysics := TGorillaPhysicsSystem.Create(FViewport);
 +  FPhysics.OnBeginContact := DoOnGorillaPhysicsNotifyContact;
 +  
 +  // create rain particle emitter
 +  FParticles := TGorillaRainParticleEmitter.Create(FViewport);
 +  FParticles.Parent := FViewport;
 +  FParticles.Camera := FCamera;
 +  FParticles.EmitParticles := 25;
 +
 +  // preconfigure particles
 +  FParticles.Colored.StartColor := TAlphaColorF.Create( TAlphaColorRec.Blue );
 +  FParticles.Colored.EndColor := TAlphaColorF.Create( TAlphaColorRec.Blueviolet );
 +  FParticles.ParticleSize   := TParticlePreset.Create(20, 20, 1, false);
 +  FParticles.ParticleGrowth := TParticlePreset.Create(0, 0, 1, false);
 +  FParticles.Colored.Enabled := false;
 +  FParticles.Wind.Enabled := false;
 +
 +  // create a physics influencer
 +  FInfluencer := TGorillaPhysicsInfluencer.Create(FParticles);
 +  FInfluencer.Emitter := FParticles;
 +  // link to physics system component
 +  FInfluencer.Physics := FPhysics;
 +  FInfluencer.Enabled := true;
 +
 +  // another particle emitter to simulate rain drop splashes when they hit an obstacle
 +  FSplashes := TGorillaSpotParticleEmitter.Create(FViewport);
 +  FSplashes.Parent := FViewport;
 +  FSplashes.Camera := FCamera;
 +  FSplashes.LoadTexture('splash.png');
 +
 +  // activate physics
 +  FPhysics.Active := true;
 +  FParticles.Start();
 +  FSplashes.Start();
 +end;
 +</file>
 ===== Example ===== ===== Example =====
  
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 begin begin
   LParticles := TGorillaEruptionParticleEmitter.Create(FGorilla);   LParticles := TGorillaEruptionParticleEmitter.Create(FGorilla);
 +  LParticles.Parent := FGorilla;
   LParticles.Camera := FCamera;   LParticles.Camera := FCamera;
  
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 begin begin
   LParticles := TGorillaRainParticleEmitter.Create(FGorilla);   LParticles := TGorillaRainParticleEmitter.Create(FGorilla);
 +  LParticles.Parent := FGorilla;
   LParticles.Camera := FCamera;   LParticles.Camera := FCamera;
 end; end;
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 begin begin
   LParticles := TGorillaSnowParticleEmitter.Create(FGorilla);   LParticles := TGorillaSnowParticleEmitter.Create(FGorilla);
 +  LParticles.Parent := FGorilla;
   LParticles.Camera := FCamera;   LParticles.Camera := FCamera;
 end; end;
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 end; end;
 </file> </file>
 +
  
 Next step: [[physics|Physics]] Next step: [[physics|Physics]]
Except where otherwise noted, content on this wiki is licensed under the following license: Public Domain


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