GAS/GAS_SandForces.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Jeff Lait
 *      Side Effects Software Inc
 *      123 Front Street West, Suite 1401
 *      Toronto, Ontario
 *      Canada   M5J 2M2
 *      416-504-9876
 *
 * NAME:        GAS_SandForces.h ( GAS Library, C++)
 *
 * COMMENTS:
 */

#ifndef __GAS_SandForces__
#define __GAS_SandForces__

#include "GAS_API.h"

#include "GAS_SubSolver.h"
#include "GAS_Utils.h"

class SIM_VectorField;
class SIM_ScalarField;

class GAS_API GAS_SandForces : public GAS_SubSolver
{
public:
    GET_DATA_FUNC_S(GAS_NAME_SURFACE, SurfaceName);
    GET_DATA_FUNC_S(GAS_NAME_PRESSURE, PressureName);
    GET_DATA_FUNC_S(GAS_NAME_STRAIN, StrainName);
    GET_DATA_FUNC_S(GAS_NAME_VELOCITY, VelocityName);

    GETSET_DATA_FUNCS_F("frictionangle", FrictionAngle);
    GETSET_DATA_FUNCS_F("cohesion", Cohesion);
    
    GET_DATA_FUNC_B(GAS_NAME_USETIMESTEP, UseTimeStep);
    GET_DATA_FUNC_F(GAS_NAME_TIMESCALE, TimeScale);

protected:
    explicit             GAS_SandForces(const SIM_DataFactory *factory);
    virtual             ~GAS_SandForces();

    /// Compute the amount of stress to add to each voxel according
    /// to the given strain amounts.
    virtual bool         solveGasSubclass(SIM_Engine &engine,
                                SIM_Object *obj,
                                SIM_Time time,
                                SIM_Time timestep);

    /// Using the given strain field, update the velocity
    /// field to take into account the relevant strains.
    void                 addSandForces(SIM_VectorField *velocity,
                                    SIM_ScalarField *surface,
                                    SIM_MatrixField *strain,
                                    SIM_ScalarField *pressure,
                                    fpreal timestep);

private:
    static const SIM_DopDescription     *getDopDescription();

    DECLARE_STANDARD_GETCASTTOTYPE();
    DECLARE_DATAFACTORY(GAS_SandForces,
                        GAS_SubSolver,
                        "Gas Sand Forces",
                        getDopDescription());
};

#endif

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