[Question]Export Issues

[EasonWangc]

Hello! I am currently using the loopstructural package on my dataset to generate a 3D geological model through interpolation. After saving it as a VTK file using the save method, I noticed that the data is stored in cell format, and there seems to be no indexing for the cell data. I need to correlate the coordinates of the generated 3D model with the attribute values to perform subsequent data analysis. Do you have any suggestions on how to achieve this? Or could there be an issue with my export process?

[lachlangrose]

Hi @EasonWangc can you use the points attribute from the model grid? Alternatively you could pass your xyz locations to model.evaluate_model to get the stratigraphic IDs.

[EasonWangc]

您好，您可以使用模型网格中的 points 属性吗？或者，您可以将 xyz 位置传递给 model.evaluate_model 以获取地层 ID。

My model point data only contains the coordinates of the points, with a total of 62,500 data points, while there are 57,600 attribute values, which matches the number of cells. It seems a bit complicated to correlate the point data with the cell attribute data. I apologize, but I am not familiar with the method you mentioned. I noticed that the update notice on the official website mentioned that model data can be exported as CSV and JSON. How can I do this? Is there any example code available?

[lachlangrose]

Try grid.cell_centre() to get the cell centre for pyvists object

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On Fri, 28 Feb 2025, 5:40 pm EasonWangc, ***@***.***> wrote: 您好，您可以使用模型网格中的 points 属性吗？或者，您可以将 xyz 位置传递给 model.evaluate_model 以获取地层 ID。 My model point data only contains the coordinates of the points, with a total of 62,500 data points, while there are 57,600 attribute values, which matches the number of cells. It seems a bit complicated to correlate the point data with the cell attribute data. I apologize, but I am not familiar with the method you mentioned. I noticed that the update notice on the official website mentioned that model data can be exported as CSV and JSON. How can I do this? Is there any example code available? — Reply to this email directly, view it on GitHub <#221 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABYHZAFSHYKGX7PHXEUZOBD2SAAFJAVCNFSM6AAAAABYBRTE52VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOBZHA2TOOJQGQ> . You are receiving this because you commented.Message ID: ***@***.***> [image: EasonWangc]*EasonWangc* left a comment (Loop3D/LoopStructural#221) <#221 (comment)> 您好，您可以使用模型网格中的 points 属性吗？或者，您可以将 xyz 位置传递给 model.evaluate_model 以获取地层 ID。 My model point data only contains the coordinates of the points, with a total of 62,500 data points, while there are 57,600 attribute values, which matches the number of cells. It seems a bit complicated to correlate the point data with the cell attribute data. I apologize, but I am not familiar with the method you mentioned. I noticed that the update notice on the official website mentioned that model data can be exported as CSV and JSON. How can I do this? Is there any example code available? — Reply to this email directly, view it on GitHub <#221 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABYHZAFSHYKGX7PHXEUZOBD2SAAFJAVCNFSM6AAAAABYBRTE52VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOBZHA2TOOJQGQ> . You are receiving this because you commented.Message ID: ***@***.***>

[EasonWangc]

I have some other questions, and I will ask them separately. Thank you!

[EasonWangc]

尝试 grid.cell_centre（） 获取 pyvists 对象的单元中心
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Hello! The method for obtaining the unit center of the object has resolved my issues, thank you very much! Additionally, I hope to export the model to modeling software for use, which requires exporting the model's mesh structure. However, the VTK file I exported is in RectilinearGrid, and it cannot be exported to the OBJ file format needed by the modeling software. Do you have any good solutions for this?

[lachlangrose]

Hi@EasonWangc, what geometry do you want to try and export? The default geometry for storing a model is a rectilinear grid, but you can also export as a tetrahedral mesh. Alternatively, you could import vertices or cell centres from your mesh and then query the model.

[EasonWangc]

Hi@EasonWangc，您要尝试导出什么几何体？用于存储模型的默认几何图形是直线网格，但您也可以导出为四面体网格。或者，您可以从网格导入顶点或单元中心，然后查询模型。

Hello! I’m glad to receive your response. I want to export a tetrahedral mesh and have colors to distinguish different attribute values, just like what I see in the visualization module. Additionally, I found that I cannot find a way to index the cell block (CELL), but the values are stored in the CELL. Do you have any good methods for these two issues? Thank you very much!

[markjessell]

Hi @EasonWangc

Claude.ai put together this code for converting vtk meshes from Loop3D as obj format files. I admit I can't test this fully as I don't have LeapFrog on my machine, but it looks fine in https://3dviewer.net/ cheers Mark

vtk2obj_2.zip

[lachlangrose]

Closing this for now, feel free to reopen if you still have issues @EasonWangc