code: public int getVertices(double[] coords) {
          for (int i = 0; i < numVertices; i++) {
              Point3d pnt = pointBuffer[vertexPointIndices[i]].pnt;
              coords[i * 3 + 0] = pnt.x;
              coords[i * 3 + 1] = pnt.y;
              coords[i * 3 + 2] = pnt.z;
          }
          return numVertices;
      }
docs: Returns the coordinates of the vertex points of this hull.
  
  @param coords
  returns the x, y, z coordinates of each vertex. This length of
  this array must be at least three times the number of
  vertices.
  @return the number of vertices
  @see QuickHull3D#getVertices()
  @see QuickHull3D#getFaces()