Streamtracer from Point Data

ParaView Support
1

Hi, I have a VTK with only Point Data and Vector data and I would like to generate StreamLines following the Vector Field. I can visualize the vector field using Glyphs but the problem is that Streamtracer doesn’t show anything. The VTK has this format:

ASCII
DATASET UNSTRUCTURED_GRID
POINTS 132651 double
-100.0 -100.0 -100.0
-100.0 -100.0 -96.0
...
CELLS 0 0

CELL_TYPES 0

POINT_DATA 132651
VECTORS Vectors1 double
1.3865089739273324e-08 6.834997702797794e-08 2.0137151470163464e-08
...

Is there anything I’m missing in the VTK file?

2

Cells. You are missing cells.

If you think about it, streamlines don’t make any sense if you don’t have some region of space (i.e. a volume) that has a stream. You don’t have that. You just have some sparse points that define a vector and empty space in between them.

Cells are what define how these sparse points you have are supposed to define what the flow looks like between the points.

For a variety of reasons, the tools for going from just points to a connected region of cells are not great. The most common solution is to use the Delaunay 3D filter. It looks like that should work for you.

3

Hi, thanks for the tip. I see, I’ll try to generate cell data then.
I tried the Delaunay 3D and it allowed me to generate a stream with StreamTracer, thanks so much!