Handling overlapping node labels and dense graph visualization in ParaView/pvpython

Development
1

Hello,

I am exploring graph/extremum graph visualization workflows in ParaView (5.13.3) and testing node labeling for dense topology visualizations.

So far I tested:

  • Find Data

  • Extract Selection

  • Point Labels / Cell Labels

  • Label font size, color, and style customization

These work correctly for selective labeling.

However, the main issue appears when multiple nearby nodes become very dense. Even after zooming in, labels overlap heavily and become unreadable. Zooming alone is often insufficient when points are extremely close.

I wanted to ask:

  1. Are there recommended ParaView filters/workflows for handling dense node labels or overlapping labels?

  2. Is there a way to dynamically show/hide labels based on zoom level or camera distance?

  3. Can pvpython be used to:

    • selectively render labels,

    • offset labels,

    • control label visibility,

    • automate local zoom/screenshot generation,

    • or improve readability for nearby nodes?

  4. Are there known workflows for extremum graph/topology graph visualization where only certain important nodes are labeled automatically?

  5. Does ParaView/VTK support any collision avoidance or smart label placement for point labels?

At the moment, it seems:

  • selective labeling works,

  • local extraction works,

  • font customization works,
    but automatic readable visualization for very dense nearby nodes is still difficult.

Any suggestions/workflows/examples would be very helpful.

Thank you.

2

Did you already post here: Improving label readability and zoom behavior for graph/extremum visualizations in ParaView ?

3

Yes, that was also my earlier post. After further testing, I found that selective Point/Cell Labels, font customization, and Extract Selection work correctly.

The main remaining issue is with extremely close nearby nodes where labels still overlap heavily even after zooming/extraction.

I am now exploring whether pvpython or other ParaView/VTK workflows can help improve readability for dense graph/extremum graph labeling.

Thank you.

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