FEvolutionLinearSystem::AddSymmetricForceDerivative

Navigation

API > API/Runtime > API/Runtime/Chaos > API/Runtime/Chaos/FEvolutionLinearSystem

Description

Df1Dx2 is Derivative of F for ParticleIndex1 with respect to X of Particle2. Components of Df1Dx2 are Df1Dx2[j][i] = DF1_i / DX2_j This is consistent with UnrealMath which assumes row-major matrices and treats positions as row vectors (left multiply)

We're assuming all forces are symmetric. This will add Df1Dfx2 and Df2Dfx1 = Df1Dfx2^T (and same for Df2Dv1 = Df1Dv2^T) when ParticleIndex1 != ParticleIndex2

void AddSymmetricForceDerivative  
(  
    const FSolverParticlesRange & Particles,  
    const FSolverMatrix33 *const Df1Dx2,  
    const FSolverMatrix33 *const Df1Dv2,  
    int32 ParticleIndex1,  
    int32 ParticleIndex2,  
    const FSolverReal Dt  
)  
Copy full snippet

void AddSymmetricForceDerivative (     const FSolverParticlesRange & Particles,     const FSolverMatrix33 *const Df1Dx2,     const FSolverMatrix33 *const Df1Dv2,     int32 ParticleIndex1,     int32 ParticleIndex2,     const FSolverReal Dt )