PerParticlePBDUpdateFromDeltaPosition.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "Chaos/Particle/ParticleUtilities.h"
#include "Chaos/PBDParticles.h"
#include "Chaos/PBDRigidParticles.h"
#include "Chaos/PerParticleRule.h"
 
namespace Chaos
{
class FPerParticlePBDUpdateFromDeltaPosition : public FPerParticleRule
{
  public:
      FPerParticlePBDUpdateFromDeltaPosition() {}
    virtual ~FPerParticlePBDUpdateFromDeltaPosition() {}
 
    template<class T_PARTICLES>
    inline void ApplyHelper(T_PARTICLES& InParticles, const FReal Dt, const int32 Index) const
    {
        InParticles.SetV(Index, (InParticles.GetP(Index) - InParticles.GetX(Index)) / Dt);
    }
 
    inline void Apply(FPBDParticles& InParticles, const FReal Dt, const int32 Index) const override //-V762
    {
        InParticles.V(Index) = (InParticles.GetP(Index) - InParticles.GetX(Index)) / Dt;
        InParticles.SetX(Index,  InParticles.GetP(Index));
    }
 
    inline void Apply(TPBDRigidParticles<FReal, 3>& InParticles, const FReal Dt, const int32 Index) const override //-V762
    {
        ApplyHelper(InParticles, Dt, Index);
        InParticles.SetW(Index, FRotation3f::CalculateAngularVelocity(InParticles.GetRf(Index), InParticles.GetQf(Index), FRealSingle(Dt)));
    }
 
    inline void Apply(FPBDRigidParticleHandle* Particle, const FReal Dt) const override //-V762
    {
        const FVec3& CenterOfMass = Particle->CenterOfMass();
        const FVec3 CenteredX = Particle->XCom();
        const FVec3 CenteredP = Particle->PCom();
        Particle->SetV(FVec3::CalculateVelocity(CenteredX, CenteredP, Dt));
        Particle->SetWf(FRotation3f::CalculateAngularVelocity(Particle->GetRf(), Particle->GetQf(), FRealSingle(Dt)));
    }
 
    inline void Apply(TTransientPBDRigidParticleHandle<FReal, 3>& Particle, const FReal Dt) const override //-V762
    {
        const FVec3& CenterOfMass = Particle.CenterOfMass();
        const FVec3 CenteredX = Particle.XCom();
        const FVec3 CenteredP = Particle.PCom();
        Particle.SetV(FVec3::CalculateVelocity(CenteredX, CenteredP, Dt));
        Particle.SetWf(FRotation3f::CalculateAngularVelocity(Particle.GetRf(), Particle.GetQf(), FRealSingle(Dt)));
    }
};
 
template<class T, int d>
using TPerParticlePBDUpdateFromDeltaPosition UE_DEPRECATED(4.27, "Deprecated. this class is to be deleted, use FPerParticlePBDUpdateFromDeltaPosition instead") = FPerParticlePBDUpdateFromDeltaPosition;
}