Function createClothSheet

tutorials/collide/collide_device.cpp:187–285

}

unsigned int createClothSheet (RTCScene scene)
{
  std::unique_ptr<collide2::ClothModel> cloth (new collide2::ClothModel());
  cloth->x_0_.resize (NX*NZ);
  cloth->x_.resize (NX*NZ);
  cloth->x_old_.resize (NX*NZ);
  cloth->x_last_.resize (NX*NZ);
  collide2::vec_t nullvec(0.f, 0.f, 0.f);
  collide2::vec_t gravity(0.f, -9.8f, 0.f);
  cloth->v_.resize (NX*NZ, nullvec);
  cloth->a_.resize (NX*NZ, gravity);
  cloth->m_.resize (NX*NZ, m);
  cloth->m_inv_.resize (NX*NZ, 1.f / m);
  cloth->tris_.resize (2*(NX-1)*(NZ-1));

  initializeClothPositions (*cloth);

  // init topology
  for (size_t i=0; i<NX-1; ++i) {
    for (size_t j=0; j<NZ-1; ++j) {
      cloth->tris_[2*(i*(NZ-1)+j)].v0 = i*NZ+j;
      cloth->tris_[2*(i*(NZ-1)+j)].v1 = i*NZ+j+1;
      cloth->tris_[2*(i*(NZ-1)+j)].v2 = (i+1)*NZ+j+1;

      cloth->tris_[2*(i*(NZ-1)+j)+1].v0 = (i+1)*NZ+j+1;
      cloth->tris_[2*(i*(NZ-1)+j)+1].v1 = (i+1)*NZ+j;
      cloth->tris_[2*(i*(NZ-1)+j)+1].v2 = i*NZ+j;
    }
  }

  cloth->k_stretch_ = ks;
  cloth->k_damp_ = damping;

  // set distance constraints
  for (size_t vID=0; vID<NX*NZ; ++vID) {
    
    size_t i = vID/NZ;
    size_t j = vID%NZ;

    std::vector<size_t> sIDs;

    if (i<NX-1) sIDs.push_back (vID+NZ);
    if (j<NZ-1) sIDs.push_back (vID+1);

    if (i<NX-1) {
      if (j<NZ-1) {
        sIDs.push_back (vID+NZ+1);
      }
    }

    if (i>0) {
      if (j<NZ-1) {
        sIDs.push_back (vID-NZ+1);
      }
    }

    for (auto id : sIDs) {
      auto c = new collide2::DistanceConstraint ();