# Multiblock variables selection and availability in calculator filter

**URL:** https://discourse.paraview.org/t/multiblock-variables-selection-and-availability-in-calculator-filter/15397
**Category:** ParaView Support
**Created:** [September 16, 2024, 9:27am UTC](https://discourse.paraview.org/t/multiblock-variables-selection-and-availability-in-calculator-filter/15397 "2024-09-16T09:27:47Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![athos\_epa](https://discourse.paraview.org/user_avatar/discourse.paraview.org/athos_epa/32/15186_2.png) [@athos\_epa](https://discourse.paraview.org/u/athos_epa)
#### Post date: [September 16, 2024, 9:27am UTC](https://discourse.paraview.org/t/multiblock-variables-selection-and-availability-in-calculator-filter/15397/1 "2024-09-16T09:27:47Z")

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Hello everyone,  
I’m trying to compute the Drag and Lift forces of a tumbling cylinder entering the atmosphere. From various tutorials online I found the procedure to do so with a series of filters. However, I noticed that when trying to compute e.g. Drag = Pressure\*Normals\_X, setting the Attribute Type to Cell Data, I do not have the option to choose for scalar value the Pressure data. Pressure is only available if I select Point Data for Attribute Type. Is this due to how I run my simulation or is there an option in Paraview to include Pressure values for the specific block I want? I am using SU2 to run my simulations and as output I have Paraview multiblock .vtm files.  
Thank you in advance for your help.

 ![Screenshot 2024-09-16 122529](https://discourse.paraview.org/uploads/default/original/2X/1/12ae385c3fa72a0842476eb4ada662481d15440b.jpeg)  
 ![Screenshot 2024-09-16 121701](https://discourse.paraview.org/uploads/default/original/2X/3/3eb2bd720d23b29f24beab95026004b3e82fd5d2.png)

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### Author: ![Kenneth\_Moreland](https://discourse.paraview.org/user_avatar/discourse.paraview.org/kenneth_moreland/32/15033_2.png) [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [September 16, 2024, 10:54am UTC](https://discourse.paraview.org/t/multiblock-variables-selection-and-availability-in-calculator-filter/15397/2 "2024-09-16T10:54:27Z")

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Yes. It sounds like your simulation is outputting pressure as a point field rather than a cell field. That is fine. The `Generate Surface Normals` filter creates accurate normals for both points and cells. Just use `Point Data` for the `Attribute Type` in the `Calculator` filter.

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### Author: ![athos\_epa](https://discourse.paraview.org/user_avatar/discourse.paraview.org/athos_epa/32/15186_2.png) [@athos\_epa](https://discourse.paraview.org/u/athos_epa)
#### Post date: [September 16, 2024, 1:55pm UTC](https://discourse.paraview.org/t/multiblock-variables-selection-and-availability-in-calculator-filter/15397/3 "2024-09-16T13:55:38Z")

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Hello Kenneth,  
Thank you very much for the quick reply. Glad to hear that this should work 😁  
Best regards.