# Problem with Connected Surface Properties
**URL:** https://discourse.paraview.org/t/problem-with-connected-surface-properties/16688
**Category:** ParaView Support
**Created:** [May 21, 2025, 3:41pm UTC](https://discourse.paraview.org/t/problem-with-connected-surface-properties/16688 "2025-05-21T15:41:52Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@woodscn](https://discourse.paraview.org/u/woodscn)
#### Post date: [May 21, 2025, 3:41pm UTC](https://discourse.paraview.org/t/problem-with-connected-surface-properties/16688/1 "2025-05-21T15:41:52Z")
I have used a Contour filter to create some bubbles in my dataset. When I try to run Connected Surface Properties to figure out the centroid/volume of these bubbles, it leaves a bunch of the following errors:
```auto
ERROR: In vtkMultiObjectMassProperties.cxx, line 300
vtkMultiObjectMassProperties (0x6ca9e160): No data!
```
Any ideas what I might be doing wrong here?
---
### Author:  [@woodscn](https://discourse.paraview.org/u/woodscn)
#### Post date: [May 21, 2025, 3:52pm UTC](https://discourse.paraview.org/t/problem-with-connected-surface-properties/16688/2 "2025-05-21T15:52:33Z")
The code in VTK lists the error condition as:
```auto
if (input->GetPolys()->GetNumberOfCells() < 1 || input->GetNumberOfPoints()<1)
```
I noticed that my input data was a Partitioned Data Collection, rather than a bare PolyData. I ran a Merge Blocks and I’m exploring whether this resolved the issue.
Update: I believe this was the problem. The filter is just not compatible with partitioned data collections.
---
### Author:  [@woodscn](https://discourse.paraview.org/u/woodscn)
#### Post date: [May 21, 2025, 4:04pm UTC](https://discourse.paraview.org/t/problem-with-connected-surface-properties/16688/3 "2025-05-21T16:04:34Z")
Perhaps I’m misunderstanding what this filter is supposed to be doing? I would have expected all the connected objects to have the same volume. This is what I get, instead:
ObjectIds seems to be getting it right. Am I supposed to manually sum on the different Objects? I’m also not sure where the negative volumes are coming from.
---
### Author:  [@woodscn](https://discourse.paraview.org/u/woodscn)
#### Post date: [May 21, 2025, 4:05pm UTC](https://discourse.paraview.org/t/problem-with-connected-surface-properties/16688/4 "2025-05-21T16:05:32Z")
Related: [Estimating volume of separated surfaces, plotting histogram - ParaView Support - ParaView](https://discourse.paraview.org/t/estimating-volume-of-separated-surfaces-plotting-histogram/12005/6)