Code/EnginePlugins/ParticlePlugin/Behavior/ParticleBehavior_Flies.h - dev - redgpu/ezEngine

Code/EnginePlugins/ParticlePlugin/Behavior/ParticleBehavior_Flies.h

51 строка2 KB

Jan Krassnigg

Added Expression Particle Behavior (#1884)

29 мар 2026, 23:32

29 мар 2026, 23:32071fa9d

#pragma once

#include <ParticlePlugin/Behavior/ParticleBehavior.h>

/// Behavior that makes particles move like flies or insects
///
/// Particles move at a constant speed with random direction changes.
/// They tend to stay within a certain distance from the effect origin.
class EZ_PARTICLEPLUGIN_DLL ezParticleBehaviorFactory_Flies final : public ezParticleBehaviorFactory
{
  EZ_ADD_DYNAMIC_REFLECTION(ezParticleBehaviorFactory_Flies, ezParticleBehaviorFactory);

public:
  ezParticleBehaviorFactory_Flies();
  ~ezParticleBehaviorFactory_Flies();

  virtual const ezRTTI* GetBehaviorType() const override;
  virtual void CopyBehaviorProperties(ezParticleBehavior* pObject, bool bFirstTime) const override;

  virtual void QueryFinalizerDependencies(ezSet<const ezRTTI*>& inout_finalizerDeps) const override;

  virtual void Save(ezStreamWriter& inout_stream) const override;
  virtual void Load(ezStreamReader& inout_stream, const ezParticleEffectDescriptor& ownerEffectDescriptor, const ezParticleSystemDescriptor& ownerSystemDescriptor) override;

  float m_fSpeed = 0.2f;                                    ///< Movement speed in units per second
  float m_fPathLength = 0.2f;                               ///< Distance traveled before changing direction
  float m_fMaxEmitterDistance = 0.5f;                       ///< Maximum distance from effect origin before turning back
  ezAngle m_MaxSteeringAngle = ezAngle::MakeFromDegree(30); ///< Maximum angle change per direction update
};


class EZ_PARTICLEPLUGIN_DLL ezParticleBehavior_Flies final : public ezParticleBehavior
{
  EZ_ADD_DYNAMIC_REFLECTION(ezParticleBehavior_Flies, ezParticleBehavior);

public:
  virtual void CreateRequiredStreams() override;

  float m_fSpeed = 0.2f;
  float m_fPathLength = 0.2f;
  float m_fMaxEmitterDistance = 0.5f;
  ezAngle m_MaxSteeringAngle = ezAngle::MakeFromDegree(30);

protected:
  virtual void Process(ezUInt64 uiNumElements) override;

  ezProcessingStream* m_pStreamPosition = nullptr;
  ezProcessingStream* m_pStreamVelocity = nullptr;

  ezTime m_TimeToChangeDir;
};