[Paraview] Contours of streamlines crashing

[David Borland]

I have some steady-state vector field data that I am visualizing using 
streamlines and particles via the following pipeline:

Mask Points on the input (~100 points) to generate seeds
Stream Tracer with Custom Source to generate the streamlines
Contour on Integration Time to generate particles, which can then be 
animated by animating the Isosurface value.

This was working fine in v3.6.2, but started crashing in v3.8.0.  
*Note:  The crashing only occurs when the streamline filter output is 
attached to a contour filter.*  After some investigating, I realized 
that part of the problem is with different default values for the Stream 
Tracer in 3.8.0 vs. 3.6.2.  From what I have been able to figure out so 
far, it looks like different values for the Integrator Type (default of 
Runge-Kutta 2 in 3.6.2 and Runge-Kutta 4.5 in 3.8.0) and Initial Step 
Length (default of 0.5 in 3.6.2 and 0.2 in 3.8.0).  After experimenting 
with these values, I have found the following:


Windows 3.6.2 64-bit binaries:  Crashes for any Runge-Kutta with Initial 
Step Size 0.5
                                                 Works for any 
Runge-Kutta with Initial Step Size 0.2

Windows 3.8.0 64-bit binaries:  Crashes for any Runge-Kutta with Initial 
Step Size 0.5,
                                                  Hangs for Runge-Kutta 
4 and 4.5 with Initial Step Size 0.2

Ubuntu Linux 3.6.2 64-bit build:  Crashes for any Runge-Kutta with 
Initial Step Size 0.5,
                                                    Crashes for 
Runge-Kutta 4.5 with Initial Step Size 0.2

Ubuntu Linux 3.8.0 64-bit build:  Crashes for any Runge-Kutta with 
Initial Step Size 0.5,
                                                    Crashes for 
Runge-Kutta 4.5 with Initial Step Size 0.2


The results on Linux seem to be more consistent than on Windows (go 
figure...), and different data sets on Windows seem to have slightly 
differnt behavior, but there certainly seems to be some interaction 
between the initial step size and the integrator type.  I'd be happy to 
log a bug if that is more appropriate than posting to the mailing list.

David