Add interpolator type (cell locator) to stream tracer with custom source
Stream lines often break with point locator (default) of stream tracer with unstructured vtu data. One solution is to choose cell locator instead of point locator. But "stream tracer with custom source", which includes all flexibility to choose source points, does not have these options to choose.
Mathieu Westphal commented
This is now available. See Interpolator type.