# Trouble Visualizing Scalar Fields and Streamlines in 3D Rotated Geometry from Axisymmetric Swirl
**URL:** https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853
**Category:** ParaView Support
**Created:** [June 23, 2025, 8:56pm UTC](https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853 "2025-06-23T20:56:55Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Kunal\_Sachdeva](https://discourse.paraview.org/u/Kunal_Sachdeva)
#### Post date: [June 23, 2025, 8:56pm UTC](https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853/1 "2025-06-23T20:56:55Z")
Hi.
I’m working with a 2D axisymmetric swirl simulation exported from ANSYS Fluent in EnSight Case Gold format. After loading it into ParaView, I apply `ExtractSurface` followed by `RotationalExtrusion` (rotating 360° around the X-axis with a resolution of 200) to generate the corresponding 3D geometry. The rotation itself works well, and the geometry looks as expected.
However, I’m facing two issues. First, when I try to visualize scalar fields on a cross-sectional plane, I apply a `Slice` to cut across the pipe at the inlet. When I color this slice by `water_vof`, I only see a narrow ring or arc of non-zero values, while the rest of the slice appears blank or missing. It seems as if the scalar field isn’t being properly projected onto the full plane.
Second, I’m also struggling with stream tracing in this revolved geometry. I try to seed streamlines from the inlet surface using a `Slice` as the source, and apply a `StreamTracer` with `velocity` selected as the vector field. Regardless of whether I use a point cloud or a high-resolution line source, I get no streamlines.
Do you think I am doing something non-physical or something inherently wrong which cannot be handled by ParaVIEW?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 24, 2025, 7:02am UTC](https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853/2 "2025-06-24T07:02:30Z")
Please share your data and a state file.
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### Author:  [@Kunal\_Sachdeva](https://discourse.paraview.org/u/Kunal_Sachdeva)
#### Post date: [June 25, 2025, 4:23pm UTC](https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853/4 "2025-06-25T16:23:28Z")
Here it is.
[statefile.pvsm](https://discourse.paraview.org/uploads/short-url/6TyHBe4xSiCGZRpmUoXnKtclW10.pvsm) (787.3 KB)
> **[data.zip](https://drive.google.com/file/d/1KpUxzZqQWbaN56pc8THZhCCY0tEuFc84/view?usp=sharing)**
>
> Google Drive file.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 30, 2025, 11:44am UTC](https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853/5 "2025-06-30T11:44:49Z")
RotationalExtrusion doesnt create a volume from a slice sadly. It would be nice if it did but it does not. You need to create that volume yourself either outside of ParaView or using a programmable filter, which may not be easy.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 30, 2025, 11:53am UTC](https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853/6 "2025-06-30T11:53:51Z")
Nevermind it **is** possible!
Use `VolumeOfRevolution` filter:
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### Author:  [@Kunal\_Sachdeva](https://discourse.paraview.org/u/Kunal_Sachdeva)
#### Post date: [July 2, 2025, 7:41pm UTC](https://discourse.paraview.org/t/trouble-visualizing-scalar-fields-and-streamlines-in-3d-rotated-geometry-from-axisymmetric-swirl/16853/7 "2025-07-02T19:41:53Z")
Got it. Thanks for your help.