Blending a junction of vessels

[Denis Pushin]

Hi, everyone.

I have a problem with creating a model of blood vessels suitable for CFD calculations. I can not create a physiological junction in bifurcation area (junction.jpg, white arrows point out on problem regions). Specifically, it is impossible for me to blend junction using PolyData software. There is a option in PolyData -> LocalOps -> Local region selection named Blend, but I don't understand how to apply this operator to model (i.e. what button should I press).

In turn, when I'm trying to create a model with Parasolid software, I always get an error (I saved log message in the attached file log.log).

Thereby, I have two questions:

1. How to blend vessel junctions using PolyData software?
2. What means the error in log.log file?

Thank your in advance for any help.

[Adam Updegrove]

Hi Denis,

Please take a look at our online documentation for PolyData as well as our youtube videos which explain some operations you can do to smooth junctions. Here is the link for the youtube video covering some of the operations: https://www.youtube.com/watch?v=s3U3RfCUHyE

Parasolid can only be used if you have a commercial license for Parasolid as well as a version of the software that has been built with Parasolid.

Hope that helps!

SimVascular Development Team

[Denis Pushin]

Adam, thank you for a quick reply.

Yes, it helps. I solved the problem with creation of physiological junctions.

[Rudolf Hellmuth]

When I export a polyData without a blend (fillet) between vessels, I make the blend manually in Blender using the sculpt mode with dyntopo. Dyntopo remeshes the triangles locally. I add some "clay" in the gaps, which also remeshes the triangles locally because of dyntopo. Then I use the smooth tool in the sculpt mode to make everything round locally.

The method is explained at 17:50 in this Blender tutorial: https://www.youtube.com/watch?v=tZnUgt659oI

Best regards,
Rudolf