/** 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++)
{
const unsigned int offset = model.getTriangleModels()[cm]->getIndexOffset();
IndexedFaceMesh &mesh = model.getTriangleModels()[cm]->getParticleMesh();
const unsigned int nEdges = mesh.numEdges();
const IndexedFaceMesh::Edge *edges = mesh.getEdges().data();
// distance constraints
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.addGenericDistanceConstraint(v1, v2);
}
// bending constraints
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;
model.addGenericIsometricBendingConstraint(vertex1, vertex2, vertex3, vertex4);
}
}
}
}
std::cout << "Number of triangles: " << nIndices / 3 << "\n";
std::cout << "Number of vertices: " << nRows*nCols << "\n";
}
/** Create a particle model mesh
*/
void createClothMesh()
{
TriangleModel::ParticleMesh::UVs uvs;
uvs.resize(nRows*nCols);
const float dy = clothWidth / (float)(nCols - 1);
const float dx = clothHeight / (float)(nRows - 1);
Eigen::Vector3f points[nRows*nCols];
for (int i = 0; i < nRows; i++)
{
for (int j = 0; j < nCols; j++)
{
const float y = (float)dy*j;
const float x = (float)dx*i;
points[i*nCols + j] = Eigen::Vector3f(x - 5.0f, 4.0f, y - 5.0f);
uvs[i*nCols + j][0] = x / clothWidth;
uvs[i*nCols + j][1] = y / clothHeight;
}
}
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);
}
// init constraints
for (unsigned int cm = 0; cm < model.getTriangleModels().size(); cm++)
{
if (sim.getSimulationMethod() == 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 (sim.getSimulationMethod() == 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 (sim.getSimulationMethod() == 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 (sim.getBendingMethod() != 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 (sim.getBendingMethod() == 1)
model.addDihedralConstraint(vertex1, vertex2, vertex3, vertex4);
else if (sim.getBendingMethod() == 2)
model.addIsometricBendingConstraint(vertex1, vertex2, vertex3, vertex4);
}
}
}
}
}
std::cout << "Number of triangles: " << nIndices / 3 << "\n";
std::cout << "Number of vertices: " << nRows*nCols << "\n";
}