[SOLVED] Specifying indices of a VTK mesh

[MA]

It may sound a stupid question, but i couldnot add the proper indices of VTK mesh for a fixed constraint. I can visualize the indices of stl/obj file at blender easily, however for vtk at paraview, I feel lost, when I am looking to examples, I dont see any of these numbers at the vtk. I would like to ask how I can add the indices of vtk mesh.

bunny.createObject('BoxROI', name='boxROI', box='-5 -15 -5 5 -4.5 5', drawBoxes='true', position="@tetras.rest_position")

[Hugo]

Hi Marwa,

I don’t really understand your issue.
You want to apply a FixedConstraint on your mesh in the simulation, is this what you want ?
Your piece of code is showing the creation of a BoxROI, which is done properly.

Best

Hugo

[MA]

Hi Hugo,

Thanks! No, in my example the box doesn’t show fixed to the mesh

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When I add the box and I tried different locations

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I don’t know how these numbers are selected, I just looked at VTK ascii file, I could not find a solution for attaching the box to my mesh.

Best

[Hugo]

It seems your BoxROI is huge compared to your object.
Moreover it appears that the box is not including any part (i.e. any indice) of your mesh.

Hugo

[MA]

Hi Hugo,

Thanks for advising using Paraview selection tool since it easier, however, I still have a question:
concerning the points of the indices for fixed constraints. I managed to extract using find data, however, I don’t know which points to select there are many, I selected the region graphically (attached photo and ascii vtk file). Actually, the tutorial of paraview is outdated. The question which points to select from the file or I has to reduce my selection in purple( see attached photo).

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The file of ascii vtk
https://gofile.io/?c=xXERbI

Thanks,

[Hugo]

Hi @ma1991

This is a user question for the Paraview forum 😉
Let me help: you can export as a spreadsheet your selection. You can use the PointID given in the first column. This should correspond to the points you selected and specify these indices into the field “indices” of the FixedConstraint.

Best wishes

Hugo

[MA]

Hi @Hugo,

Thanks, I agree 😉 However, I dont know what I am missing, I pressed ‘s’ to select and then ‘v’ to have the table here the first column of pointID exist, I took the first column for each box, in SOFA, it seems the same error happens, I dont know what I misunderstood. I am attaching pictures

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View post on imgur.com

Thanks!

[MA]

Hi @Hugo,

I understand now where is the error was I misplaced the indices place

View post on imgur.com

However, I don’t know how to set the right dimensions of the box correctly.

Thanks so much Hugo 🙂

[Hugo]

Great I will therefore close this topic.
You can open a new one if you have another question.

Hugo

[Author]

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