I am having some problems calculating path trajectories. I am using the “Stream Tracer” filter with a 3D vector field and seeds along a line, and comparing it to a vizualisation of the field using “Surface LIC” in the same extracted subset plane. I thought the path trajectories would closely follow the LIC streaklines, but they do not. I am sure the path trajectories are incorrect - they seem to go into my solid boundaries (where the flow is zero), see pasted image - but I cannot figure out what I am doing wrong.

Any help appreciated.