PerParticlePBDShapeConstraints.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
// HEADER_UNIT_SKIP - This file does not compile anymore (Base ctor not matching)
 
#include "Chaos/PBDShapeConstraintsBase.h"
#include "Chaos/Framework/Parallel.h"
#include "Chaos/PBDSoftsEvolutionFwd.h"
 
namespace Chaos::Softs
{
 
class UE_DEPRECATED(5.0, "Per particle constraint rules are no longer used by the cloth solver. Use FPBDShapeConstraints instead.") FPerParticlePBDShapeConstraints final : public FPBDShapeConstraintsBase
{
    typedef FPBDShapeConstraintsBase Base;
 
  public:
    FPerParticlePBDShapeConstraints(const FSolverReal Stiffness = (FSolverReal)1.)
        : Base(Stiffness)
    {
    }
    FPerParticlePBDShapeConstraints(const FSolverParticles& InParticles, const TArray<FSolverVec3>& TargetPositions, const FSolverReal Stiffness = (FSolverReal)1.)
        : Base(InParticles, TargetPositions, Stiffness)
    {
    }
    virtual ~FPerParticlePBDShapeConstraints() override {}
 
    // TODO(mlentine): We likely need to use time n positions here
    void Apply(FSolverParticles& InParticles, const FSolverReal Dt, const int32 Index) const
    {
        if (InParticles.InvM(Index) > 0)
        {
            InParticles.P(Index) -= InParticles.InvM(Index) * Base::GetDelta(InParticles, Index);
        }
    }
 
    void Apply(FSolverParticles& InParticles, const FSolverReal Dt) const
    {
        PhysicsParallelFor(InParticles.Size(), [&](int32 Index) {
            Apply(InParticles, Dt, Index);
        });
    }
};
 
}  // End namespace Chaos::Softs