/// <summary>
/// Get all the entities in the current model. If `dim' is >= 0, return only the
/// entities of the specified dimension (e.g. points if `dim' == 0). The
/// entities are returned as a vector of (dim, tag) integer pairs.
/// </summary>
public int[][] GetEntities(int dim = -1)
{
IntPtr dimTagsPtr = IntPtr.Zero;
uint dimTags_n = 0;
GMshNativeMethods.gmshModelGetEntities(ref dimTagsPtr, ref dimTags_n, dim, ref ierr);
if (ierr != 0)
{
throw new GMshException(ierr);
}
int[] dimlist = new int[dimTags_n];
Marshal.Copy(dimTagsPtr, dimlist, 0, dimTags_n.Toint());
dimTagsPtr.GmshFree();
int[][] api_dimtags = new int[2][];
api_dimtags[0] = new int[dimTags_n / 2];
api_dimtags[1] = new int[dimTags_n / 2];
for (int i = 0; i < dimTags_n / 2; i++)
{
var index = i * 2;
api_dimtags[0][i] = dimlist[index];
api_dimtags[1][i] = dimlist[index + 1];
}
return(api_dimtags);
}