PerParticleGravity.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "Chaos/DynamicParticles.h"
#include "Chaos/PerParticleRule.h"
#include "Chaos/ParticleHandle.h"
 
namespace Chaos
{
    class FPerParticleGravity : public FPerParticleRule
    {
    public:
        static constexpr uint32 MaxGravityGroups = 8;
 
        FPerParticleGravity()
        {
            SetAllGravities(FVec3(0, 0, (FReal)-980.665));
        }
 
        FPerParticleGravity(const FVec3& G)
        {
            SetAllGravities(G);
        }
        FPerParticleGravity(const FVec3& Direction, const FReal Magnitude)
        {
            SetAllGravities(Direction * Magnitude);
        }
        virtual ~FPerParticleGravity() {}
 
        void Apply(TTransientPBDRigidParticleHandle<FReal, 3>& Particle, const FReal Dt) const override //-V762
        {
            if(Particle.GravityEnabled())
            {
                Particle.Acceleration() += MAccelerations[Particle.GravityGroupIndex()];
            }
        }
 
        void SetAcceleration(const FVec3& Acceleration, int32 GroupIndex)
        { 
            MAccelerations[GroupIndex] = Acceleration;
        }
 
        const FVec3& GetAcceleration(int32 GroupIndex) const
        {
            return MAccelerations[GroupIndex];
        }
 
    private:
        void SetAllGravities(const FVec3& Gravity)
        {
            for (int32 Index = 0; Index < MaxGravityGroups; Index++)
            {
                MAccelerations[Index] = Gravity;
            }
        }
 
    private:
        FVec3 MAccelerations[MaxGravityGroups];
    };
 
    template<class T, int d>
    using TPerParticleGravity UE_DEPRECATED(4.27, "Deprecated. this class is to be deleted, use FPerParticleGravity instead") = FPerParticleGravity;
}