I have two isses related to the Flow module in version 3.5 and 3.6.
I am quit surprised to see that the tracing of 3D field lines depends on the chosen scalar variable representing the “color mapped variable”. When choosing the magnetic field magnitude as the color variable, the result are long field lines that can exit from the “solar surface” and return again quit a distance away. When I change to use log10 of the magnitude for the color coding, only the very short field lines are comparable to the previous result, while all the longer lines are truncated at a short distance from their start point. I find this very strange…
When selecting a seed distribution for the stating points, using the random setup with bias, the number of starting points are limited to 500 – for the project I am working on this is on the low side – especially when the gridded setup allows up to 2500 starting points. Also for the bias value, it only accepts integer values. For my case the step between 0 and 1 is to large and already there focuses the starting points to much on the very strong field. Could this slider be turned into a float?
After playing further around with the data and plotting I realised that the problem for my first issue above, is that the color variable only allows field lines to be visualised where this color variable has values that are above zero. This seems to be an unwanted feature …
Hi kgalsgaard, glad that you’re using the flow tracer! For your first reported issue, there seems to have something wrong but I cannot put together exactly what went wrong. So, to help with the debug process, would you mind opening a issue on Github (Issues · NCAR/VAPOR · GitHub) with specifications like the data set you used, the parameters you used, the expected behavior, and the observed behavior?
For your second concern, I’ve opened two separate tickets on Github:
Please feel free to engage and track issue status there!