Missing Slices from Planar Analysis

[Koaib Kaleem]

Hi everyone,

When I run planar analysis, i get the slices, but when i reopen the file I cannot see them (though I save my changes), is it a problem or is it supposed to be like this?

I would want to have the plane saved as in ss # 2

Thank You

[Rob McDonald]

I believe the slices are not currently saved to the *.vsp3 file.

However, if you choose to show them and hide the surface mesh (as you have done), you can then use File...Export... to export them to any of the triangle file formats -- *.stl, *.tri, etc.

If you really want, you can then import those files back into OpenVSP as a stand-alone MeshGeom.

Rob

[Brandon Litherland]

Yesterday I would have put money down that the slices were saved.  I would have lost.
The slices and external mesh do not save, as Rob stated, even though the bounding box for the mesh geometry remains (which is very odd...). Something is getting stored with that MeshGeom and I suppose I should crack open the *.vsp3 file to take a look which is a problem for another day or another user.  OpenVSP does, however, save point clouds extracted from the slices (Other > Mesh off > Convert to Point Cloud) if you're trying to do Fit Model or something.  Otherwise, follow Rob's suggestions to save then import the mesh.

[Koaib Kaleem]

Thank you both of you.

Yes, Exactly its not saving even though the bounding box exists, one more thing i would like to bring to notice is that convert to point cloud is working for me but when i click convert to ngon mesh option, vsp closes by itself.

thank you

[Rob McDonald]

Converte to NGon should work for something processed through CompGeom.  I'm not sure if it will work with something produced through planar slices.  Please describe exactly what you're trying and also possibly include an example file.

The 'Convert to NGon' button was really only there for my debugging purposes as I developed the capability.  My plan was to remove the button - but I got lazy and left it there.  It really has no practical purpose for everyone else.

In fact, NGon mesh geoms don't save any of the geometric data to the file -- they just leave an empty shell behind if you save and load them.  I should clean that up somehow (either make them save, or drop them entirely)...

Rob

[Brandon Litherland]

From the screenshot, it looks like you're starting the process for Fit Model on the Gen 5 you discuss in this post: https://groups.google.com/g/openvsp/c/bdyl2Fe51Fw/m/ioh7Jk-3AAAJ.

If this is the case, we can help you move in the right direction.  Did you take that STEP file and create an STL of it and import?

[Brandon Litherland]

Rob,  I was playing with the gen 5 geometry shared in the other post and when I try to run planar slice on the imported STL while it's still in meters, there are lots of missing chunks in the slices.  However, if I scale it up a bit to feet (3.28084), planar slice seems much happier and catches parts that it missed.  Is there a truncation thing going on under the hood here?

[Rob McDonald]

I don't know which STL file you're working from.  I see STEP, CGNS, and some others, but no STL.

I suspect the STL file is not self-watertight -- it is probably made up of a bunch of non-watertight parts.  Planar Slice will have trouble with that.

You might actually try rotating it 90deg about Z to see if that helps...

Rob

[Brandon Litherland]

I opened the STEP in Creo and created a decent mesh with fairly regular tris from that.  I'll see if I can share it when I get back.

[Koaib Kaleem]

Yes, I had taken step file and tehn converted it into stl using an online converter.

I m attaching the file but it says it is out of limit. Is there any way i can do it other way.

I have attched somne screenshots to give a clue of what I am doing, the mesh geoms or geoms as "cocpit1", "station1" you see here are the planar slices i m takeing help of to model my fuselage.

regrads

[Koaib Kaleem]

also the dimensions of teh stl file taht i had shared in prev post is meteres, to get full scale model it is to be multiplied by 19. and to get the wind tunnel model as ppr it is to be multiplied by 0.75