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; }