17.3.4.3 Streamline Geometry

The geometry of the streamlines is described using a polyline set. The indexable element type “nodes” is used to attach point geometry to the nodes of the polylines, with an explicit total node count. The polyline set usually consists of multiple polylines, and the node count per polyline array is used to differentiate each polyline within the set. The node indexable elements are used to store properties. As an example, the time of flight to producer displayed in Figure 17.3-2 .

The indexable element type “intervals” is used to attach properties or otherwise reference the intervals within the polyline set. If N is the number of nodes on a polyline (N>1), then that line has N-1 intervals. The interval count in the polyline set is the total sum of intervals summed over the polylines.