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// DO NOT EDIT !
// This file is generated using the MantaFlow preprocessor (prep generate).
/******************************************************************************
*
* MantaFlow fluid solver framework
* Copyright 2011 Tobias Pfaff, Nils Thuerey
*
* This program is free software, distributed under the terms of the
* Apache License, Version 2.0
* http://www.apache.org/licenses/LICENSE-2.0
*
* Moving obstacles
*
******************************************************************************/
#include "movingobs.h"
#include "commonkernels.h"
#include "randomstream.h"
using namespace std;
namespace Manta {
//******************************************************************************
// MovingObs class members
int MovingObstacle::sIDcnt = 10;
MovingObstacle::MovingObstacle(FluidSolver *parent, int emptyType)
: PbClass(parent), mEmptyType(emptyType)
{
mID = 1 << sIDcnt;
sIDcnt++;
if (sIDcnt > 15)
errMsg(
"currently only 5 separate moving obstacles supported (are you generating them in a "
"loop?)");
}
void MovingObstacle::add(Shape *shape)
{
mShapes.push_back(shape);
}
void MovingObstacle::projectOutside(FlagGrid &flags, BasicParticleSystem &parts)
{
LevelsetGrid levelset(mParent, false);
Grid<Vec3> gradient(mParent);
// rebuild obstacle levelset
FOR_IDX(levelset)
{
levelset[idx] = flags.isObstacle(idx) ? -0.5 : 0.5;
}
levelset.reinitMarching(flags, 6.0, 0, true, false, FlagGrid::TypeReserved);
// build levelset gradient
GradientOp(gradient, levelset);
parts.projectOutside(gradient);
}
void MovingObstacle::moveLinear(
Real t, Real t0, Real t1, Vec3 p0, Vec3 p1, FlagGrid &flags, MACGrid &vel, bool smooth)
{
Real alpha = (t - t0) / (t1 - t0);
if (alpha >= 0 && alpha <= 1) {
Vec3 v = (p1 - p0) / ((t1 - t0) * getParent()->getDt());
// ease in and out
if (smooth) {
v *= 6.0f * (alpha - square(alpha));
alpha = square(alpha) * (3.0f - 2.0f * alpha);
}
Vec3 pos = alpha * p1 + (1.0f - alpha) * p0;
for (size_t i = 0; i < mShapes.size(); i++)
mShapes[i]->setCenter(pos);
// reset flags
FOR_IDX(flags)
{
if ((flags[idx] & mID) != 0)
flags[idx] = mEmptyType;
}
// apply new flags
for (size_t i = 0; i < mShapes.size(); i++) {
#if NOPYTHON != 1
mShapes[i]->_args.clear();
mShapes[i]->_args.add("value", FlagGrid::TypeObstacle | mID);
mShapes[i]->applyToGrid(&flags, 0);
#else
errMsg("Not yet supported...");
#endif
}
// apply velocities
FOR_IJK_BND(flags, 1)
{
bool cur = (flags(i, j, k) & mID) != 0;
if (cur || (flags(i - 1, j, k) & mID) != 0)
vel(i, j, k).x = v.x;
if (cur || (flags(i, j - 1, k) & mID) != 0)
vel(i, j, k).y = v.y;
if (cur || (flags(i, j, k - 1) & mID) != 0)
vel(i, j, k).z = v.z;
}
}
}
} // namespace Manta
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