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var 
  FParticles : TGorillaParticleEmitter;

procedure TForm1.FormCreate(Sender: TObject);
var LParticleMat : TParticleMaterialSource;
    LVPreset   : TParticleVectorPreset;
    LColorInfl : TGorillaColoredParticleInfluencer;
begin
  // create the particle material shader
  LParticleMat := TParticleMaterialSource.Create(FGorilla);
  LParticleMat.Parent := FGorilla;
  LParticleMat.UseTexture := false;
  LParticleMat.IsTextureAtlas := false;

  // create particle emitter for spraying effect
  FParticles := TGorillaParticleEmitter.Create(FGorilla);
  FParticles.Parent := FGorilla;
  
  // connect particle shader and emitter
  LParticleMat.Emitter := FParticles;
  
  // limit number of particles
  FParticles.EmitParticles := 100;
  FParticles.MaxParticles  := 10000;
  
  // disable auto emittance, becaus we want only to emit on mouse click
  FParticles.AutoEmit := false;
  
  // enable particle caching
  FParticles.Reuse := true;

  // randomize particle properties
  // 1) random position of particles
  LVPreset := TParticleVectorPreset.Create(0, 0, 1000, Point3D(1, 1, 1), [axX, axY, axZ]);
  FParticles.ParticlePosition := LVPreset ;

  // 2) random velocity of particles
  LVPreset := TParticleVectorPreset.Create(5, 10, 1000, Point3D(1, 2, 1), [axX, axY, axZ]);
  LVPreset.RangeY.Negative := false;
  FParticles.ParticleVelocity := LVPreset;

  // 3) the rest of properties
  FParticles.ParticleSize     := TParticlePreset.Create(2, 3, 1, false);
  FParticles.ParticleAngle    := TParticlePreset.Create(0, 360, 1, false);
  FParticles.ParticleWeight   := TParticlePreset.Create(1, 1, 1, false);
  FParticles.ParticleGrowth   := TParticlePreset.Create(0, 0, 1, false);
  FParticles.ParticleLifeTime := TParticlePreset.Create(500, 5000, 1000, false);

  // create a color influencer for a starting and end color
  LColorInfl:= TGorillaColoredParticleInfluencer.Create(FParticles);
  LColorInfl.StartColor := TAlphaColorF.Create(0, 1, 0, 1);
  LColorInfl.EndColor := TAlphaColorF.Create(0, 0, 1, 0);
end;

var 
  FLatest : TPointF;
  FMouseMove : Boolean = false;
  FClickPt : TPoint3D; 

procedure TForm1.DoOnViewportMouseUp(ASender : TObject; AButton : TMouseButton;
  AShift : TShiftState; X, Y : Single);
begin
  FMouseMove := false;
end;

procedure TForm1.DoOnViewportMouseDown(ASender : TObject; AButton : TMouseButton;
  AShift : TShiftState; X, Y : Single);
var I : Integer;
begin
  if (ssLeft in AShift) then
  begin
    FMouseMove := true;
    FLatest := PointF(X, Y);
    
    // emit particles at mouse position
    FClickPt := FGorilla.ScreenToWorld(Point(round(X), round(Y)));
    for I := 0 to (FParticles.EmitParticles - 1) do
      FParticles.EmitParticle(FClickPt);
  end;
end;

procedure TForm1.DoOnViewportMouseMove(ASender : TObject; AShiftState : TShiftState;
  X, Y : Single);
var lDiff   : TPointF;
    I       : Integer;
    lOrigin : TPoint3D;
begin
  if (ssLeft in AShiftState) then
  begin
    // emit particles at mouse position
    FClickPt := FGorilla.ScreenToWorld(Point(round(X), round(Y)));
    for I := 0 to (FParticles.EmitParticles - 1) do
      FParticles.EmitParticle(FClickPt);
  end;

  if FMouseMove then
  begin
    FLatest := PointF(X, Y);
  end;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  // on some constellations you will need an interval to update the viewport
  FGorilla.Invalidate();
end;