/**
* Add a particle to the grid structure.
* \param hash cell hash, can be computed from the cellIndex (next parameter) using ComputeCellHash.
* \param cellIndex 3-dimensional index of the cell to add the particle to.
* \param p the particle that should be added to the grid.
*/
public void AddParticle(int hash, Vector3 cellIndex, ObiClothParticle p)
{
//See if the cell exists and insert the particle in it:
Cell cell = null;
if (cells.TryGetValue(hash,out cell)){
cell.AddParticle(p);
}else{
cell = new Cell(this,cellIndex,hash);
cell.AddParticle(p);
cells[hash] = cell;
}
}