Program Listing for File PositionBasedFluids.h

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#ifndef POSITION_BASED_FLUIDS_H
#define POSITION_BASED_FLUIDS_H

#include "Common/Common.h"

// ------------------------------------------------------------------------------------
namespace PBD
{
    class PositionBasedFluids
    {
    public:
        // -------------- Position Based Fluids  -----------------------------------------------------

        static bool computePBFDensity(
            const unsigned int particleIndex,               // current fluid particle
            const unsigned int numberOfParticles,           // number of fluid particles
            const Vector3r x[],                     // array of all particle positions
            const Real mass[],                              // array of all particle masses
            const Vector3r boundaryX[],             // array of all boundary particles
            const Real boundaryPsi[],                       // array of all boundary psi values (Akinci2012)
            const unsigned int numNeighbors,                // number of neighbors
            const unsigned int neighbors[],                 // array with indices of all neighbors (indices larger than numberOfParticles are boundary particles)
            const Real density0,                            // rest density
            const bool boundaryHandling,                    // perform boundary handling (Akinci2012)
            Real &density_err,                              // returns the clamped density error (can be used for enforcing a maximal global density error)
            Real &density);                             // return the density

        static bool computePBFLagrangeMultiplier(
            const unsigned int particleIndex,               // current fluid particle
            const unsigned int numberOfParticles,           // number of fluid particles
            const Vector3r x[],                     // array of all particle positions
            const Real mass[],                              // array of all particle masses
            const Vector3r boundaryX[],             // array of all boundary particles
            const Real boundaryPsi[],                       // array of all boundary psi values (Akinci2012)
            const Real density,                         // density of current fluid particle
            const unsigned int numNeighbors,                // number of neighbors
            const unsigned int neighbors[],                 // array with indices of all neighbors
            const Real density0,                            // rest density
            const bool boundaryHandling,                    // perform boundary handling (Akinci2012)
            Real &lambda);                                  // returns the Lagrange multiplier

        static bool solveDensityConstraint(
            const unsigned int particleIndex,               // current fluid particle
            const unsigned int numberOfParticles,           // number of fluid particles
            const Vector3r x[],                     // array of all particle positions
            const Real mass[],                              // array of all particle masses
            const Vector3r boundaryX[],             // array of all boundary particles
            const Real boundaryPsi[],                       // array of all boundary psi values (Akinci2012)
            const unsigned int numNeighbors,                // number of neighbors
            const unsigned int neighbors[],                 // array with indices of all neighbors
            const Real density0,                            // rest density
            const bool boundaryHandling,                    // perform boundary handling (Akinci2012)
            const Real lambda[],                            // Lagrange multiplier
            Vector3r &corr);                            // returns the position correction for the current fluid particle
    };
}

#endif