/** Create a particle model mesh
*/
void createMesh()
{
TriangleModel::ParticleMesh::UVs uvs;
uvs.resize(nRows*nCols);
const Real dy = width / (Real)(nCols - 1);
const Real dx = height / (Real)(nRows - 1);
Vector3r points[nRows*nCols];
for (int i = 0; i < nRows; i++)
{
for (int j = 0; j < nCols; j++)
{
const Real y = (Real)dy*j;
const Real x = (Real)dx*i;
points[i*nCols + j] = Vector3r(x, 1.0, y);
uvs[i*nCols + j][0] = x/width;
uvs[i*nCols + j][1] = y/height;
}
}
const int nIndices = 6 * (nRows - 1)*(nCols - 1);
TriangleModel::ParticleMesh::UVIndices uvIndices;
uvIndices.resize(nIndices);
unsigned int indices[nIndices];
int index = 0;
for (int i = 0; i < nRows - 1; i++)
{
for (int j = 0; j < nCols - 1; j++)
{
int helper = 0;
if (i % 2 == j % 2)
helper = 1;
indices[index] = i*nCols + j;
indices[index + 1] = i*nCols + j + 1;
indices[index + 2] = (i + 1)*nCols + j + helper;
uvIndices[index] = i*nCols + j;
uvIndices[index + 1] = i*nCols + j + 1;
uvIndices[index + 2] = (i + 1)*nCols + j + helper;
index += 3;
indices[index] = (i + 1)*nCols + j + 1;
indices[index + 1] = (i + 1)*nCols + j;
indices[index + 2] = i*nCols + j + 1 - helper;
uvIndices[index] = (i + 1)*nCols + j + 1;
uvIndices[index + 1] = (i + 1)*nCols + j;
uvIndices[index + 2] = i*nCols + j + 1 - helper;
index += 3;
}
}
model.addTriangleModel(nRows*nCols, nIndices / 3, &points[0], &indices[0], uvIndices, uvs);
ParticleData &pd = model.getParticles();
for (unsigned int i = 0; i < pd.getNumberOfParticles(); i++)
{
pd.setMass(i, 1.0);
}
// Set mass of points to zero => make it static
pd.setMass(0, 0.0);
pd.setMass((nRows-1)*nCols, 0.0);
// init constraints
for (unsigned int cm = 0; cm < model.getTriangleModels().size(); cm++)
{
if (simulationMethod == 1)
{
const unsigned int offset = model.getTriangleModels()[cm]->getIndexOffset();
const unsigned int nEdges = model.getTriangleModels()[cm]->getParticleMesh().numEdges();
const IndexedFaceMesh::Edge *edges = model.getTriangleModels()[cm]->getParticleMesh().getEdges().data();
for (unsigned int i = 0; i < nEdges; i++)
{
const unsigned int v1 = edges[i].m_vert[0] + offset;
const unsigned int v2 = edges[i].m_vert[1] + offset;
model.addDistanceConstraint(v1, v2);
}
}
else if (simulationMethod == 2)
{
const unsigned int offset = model.getTriangleModels()[cm]->getIndexOffset();
TriangleModel::ParticleMesh &mesh = model.getTriangleModels()[cm]->getParticleMesh();
const unsigned int *tris = mesh.getFaces().data();
const unsigned int nFaces = mesh.numFaces();
for (unsigned int i = 0; i < nFaces; i++)
{
const unsigned int v1 = tris[3 * i] + offset;
const unsigned int v2 = tris[3 * i + 1] + offset;
const unsigned int v3 = tris[3 * i + 2] + offset;
model.addFEMTriangleConstraint(v1, v2, v3);
}
}
else if (simulationMethod == 3)
{
const unsigned int offset = model.getTriangleModels()[cm]->getIndexOffset();
TriangleModel::ParticleMesh &mesh = model.getTriangleModels()[cm]->getParticleMesh();
const unsigned int *tris = mesh.getFaces().data();
const unsigned int nFaces = mesh.numFaces();
for (unsigned int i = 0; i < nFaces; i++)
{
const unsigned int v1 = tris[3 * i] + offset;
const unsigned int v2 = tris[3 * i + 1] + offset;
const unsigned int v3 = tris[3 * i + 2] + offset;
model.addStrainTriangleConstraint(v1, v2, v3);
}
}
if (bendingMethod != 0)
{
const unsigned int offset = model.getTriangleModels()[cm]->getIndexOffset();
TriangleModel::ParticleMesh &mesh = model.getTriangleModels()[cm]->getParticleMesh();
unsigned int nEdges = mesh.numEdges();
const TriangleModel::ParticleMesh::Edge *edges = mesh.getEdges().data();
const unsigned int *tris = mesh.getFaces().data();
for (unsigned int i = 0; i < nEdges; i++)
{
const int tri1 = edges[i].m_face[0];
const int tri2 = edges[i].m_face[1];
if ((tri1 != 0xffffffff) && (tri2 != 0xffffffff))
{
// Find the triangle points which do not lie on the axis
const int axisPoint1 = edges[i].m_vert[0];
const int axisPoint2 = edges[i].m_vert[1];
int point1 = -1;
int point2 = -1;
for (int j = 0; j < 3; j++)
{
if ((tris[3 * tri1 + j] != axisPoint1) && (tris[3 * tri1 + j] != axisPoint2))
{
point1 = tris[3 * tri1 + j];
break;
}
}
for (int j = 0; j < 3; j++)
{
if ((tris[3 * tri2 + j] != axisPoint1) && (tris[3 * tri2 + j] != axisPoint2))
{
point2 = tris[3 * tri2 + j];
break;
}
}
if ((point1 != -1) && (point2 != -1))
{
const unsigned int vertex1 = point1 + offset;
const unsigned int vertex2 = point2 + offset;
const unsigned int vertex3 = edges[i].m_vert[0] + offset;
const unsigned int vertex4 = edges[i].m_vert[1] + offset;
if (bendingMethod == 1)
model.addDihedralConstraint(vertex1, vertex2, vertex3, vertex4);
else if (bendingMethod == 2)
model.addIsometricBendingConstraint(vertex1, vertex2, vertex3, vertex4);
}
}
}
}
}
std::cout << "Number of triangles: " << nIndices / 3 << "\n";
std::cout << "Number of vertices: " << nRows*nCols << "\n";
}
void createMesh()
{
Vector3r points[width*height*depth];
for (unsigned int i = 0; i < width; i++)
{
for (unsigned int j = 0; j < height; j++)
{
for (unsigned int k = 0; k < depth; k++)
{
points[i*height*depth + j*depth + k] = 0.3*Vector3r((Real)i, (Real)j, (Real)k);
}
}
}
vector<unsigned int> indices;
for (unsigned int i = 0; i < width - 1; i++)
{
for (unsigned int j = 0; j < height - 1; j++)
{
for (unsigned int k = 0; k < depth - 1; k++)
{
// For each block, the 8 corners are numerated as:
// 4*-----*7
// /| /|
// / | / |
// 5*-----*6 |
// | 0*--|--*3
// | / | /
// |/ |/
// 1*-----*2
unsigned int p0 = i*height*depth + j*depth + k;
unsigned int p1 = p0 + 1;
unsigned int p3 = (i + 1)*height*depth + j*depth + k;
unsigned int p2 = p3 + 1;
unsigned int p7 = (i + 1)*height*depth + (j + 1)*depth + k;
unsigned int p6 = p7 + 1;
unsigned int p4 = i*height*depth + (j + 1)*depth + k;
unsigned int p5 = p4 + 1;
// Ensure that neighboring tetras are sharing faces
if ((i + j + k) % 2 == 1)
{
indices.push_back(p2); indices.push_back(p1); indices.push_back(p6); indices.push_back(p3);
indices.push_back(p6); indices.push_back(p3); indices.push_back(p4); indices.push_back(p7);
indices.push_back(p4); indices.push_back(p1); indices.push_back(p6); indices.push_back(p5);
indices.push_back(p3); indices.push_back(p1); indices.push_back(p4); indices.push_back(p0);
indices.push_back(p6); indices.push_back(p1); indices.push_back(p4); indices.push_back(p3);
}
else
{
indices.push_back(p0); indices.push_back(p2); indices.push_back(p5); indices.push_back(p1);
indices.push_back(p7); indices.push_back(p2); indices.push_back(p0); indices.push_back(p3);
indices.push_back(p5); indices.push_back(p2); indices.push_back(p7); indices.push_back(p6);
indices.push_back(p7); indices.push_back(p0); indices.push_back(p5); indices.push_back(p4);
indices.push_back(p0); indices.push_back(p2); indices.push_back(p7); indices.push_back(p5);
}
}
}
}
SimulationModel *model = Simulation::getCurrent()->getModel();
model->addTetModel(width*height*depth, (unsigned int)indices.size() / 4u, points, indices.data());
ParticleData &pd = model->getParticles();
for (unsigned int i = 0; i < pd.getNumberOfParticles(); i++)
{
pd.setMass(i, 1.0);
}
for (unsigned int i = 0; i < 1; i++)
{
for (unsigned int j = 0; j < height; j++)
{
for (unsigned int k = 0; k < depth; k++)
pd.setMass(i*height*depth + j*depth + k, 0.0);
}
}
// init constraints
for (unsigned int cm = 0; cm < model->getTetModels().size(); cm++)
{
const unsigned int nTets = model->getTetModels()[cm]->getParticleMesh().numTets();
const unsigned int *tets = model->getTetModels()[cm]->getParticleMesh().getTets().data();
const IndexedTetMesh::VertexTets *vTets = model->getTetModels()[cm]->getParticleMesh().getVertexTets().data();
if (simulationMethod == 1)
{
const unsigned int offset = model->getTetModels()[cm]->getIndexOffset();
const unsigned int nEdges = model->getTetModels()[cm]->getParticleMesh().numEdges();
const IndexedTetMesh::Edge *edges = model->getTetModels()[cm]->getParticleMesh().getEdges().data();
for (unsigned int i = 0; i < nEdges; i++)
{
const unsigned int v1 = edges[i].m_vert[0] + offset;
const unsigned int v2 = edges[i].m_vert[1] + offset;
model->addDistanceConstraint(v1, v2);
}
for (unsigned int i = 0; i < nTets; i++)
{
const unsigned int v1 = tets[4 * i];
const unsigned int v2 = tets[4 * i + 1];
const unsigned int v3 = tets[4 * i + 2];
const unsigned int v4 = tets[4 * i + 3];
model->addVolumeConstraint(v1, v2, v3, v4);
}
}
else if (simulationMethod == 2)
{
TetModel::ParticleMesh &mesh = model->getTetModels()[cm]->getParticleMesh();
for (unsigned int i = 0; i < nTets; i++)
{
const unsigned int v1 = tets[4 * i];
const unsigned int v2 = tets[4 * i + 1];
const unsigned int v3 = tets[4 * i + 2];
const unsigned int v4 = tets[4 * i + 3];
model->addFEMTetConstraint(v1, v2, v3, v4);
}
}
else if (simulationMethod == 3)
{
TetModel::ParticleMesh &mesh = model->getTetModels()[cm]->getParticleMesh();
for (unsigned int i = 0; i < nTets; i++)
{
const unsigned int v1 = tets[4 * i];
const unsigned int v2 = tets[4 * i + 1];
const unsigned int v3 = tets[4 * i + 2];
const unsigned int v4 = tets[4 * i + 3];
model->addStrainTetConstraint(v1, v2, v3, v4);
}
}
else if (simulationMethod == 4)
{
TetModel::ParticleMesh &mesh = model->getTetModels()[cm]->getParticleMesh();
for (unsigned int i = 0; i < nTets; i++)
{
const unsigned int v[4] = { tets[4 * i], tets[4 * i + 1], tets[4 * i + 2], tets[4 * i + 3] };
// Important: Divide position correction by the number of clusters
// which contain the vertex.
const unsigned int nc[4] = { vTets[v[0]].m_numTets, vTets[v[1]].m_numTets, vTets[v[2]].m_numTets, vTets[v[3]].m_numTets };
model->addShapeMatchingConstraint(4, v, nc);
}
}
model->getTetModels()[cm]->updateMeshNormals(pd);
}
LOG_INFO << "Number of tets: " << indices.size() / 4;
LOG_INFO << "Number of vertices: " << width*height*depth;
}
