Learning Forum

[Chris Bytheway]

I have an assembly from NX, multiple parts creating my entire model. When I import the Parasolid of the assembly into DL and try to extract the volume it fails saying 'Edges are not on same body'. Does the assembly of parts need to be 'one solid'? I cannot change my assembly into a single solid object.

I am certain there are no gaps and that I am selecting all the correct edges to create the volume.

Many thanks,

Chris

[Subashni Ravichandran]

Hello ChrisBTW

Could you please "Share" topology of the model and try to extract the Volume again?

Is it possible for you to share the model with us for investigation?

[Ethan Rabinowitz]

hi ChrisBTW , in the background, the volume extract tool must be able to merge all the bodies...then it finds all the internal faces and makes a solid out of them.  If the bodies can't merge, you get the edge error.

It possible there are no obvious gaps but still bodies won't merge.  The merge may cause corrupted geometry (ie you can't merge 2 cylinders touching tangentially into 1 body because they only share 1 edge).  Its also possible corruption in other areas prevent the merge.

In these cases,  slight edits/repairs to the geometry - that won't impact the fluid volume - must be made to get them to merge.  However the assembly does not need to remain merged.  I often use the combine tool to fix the edit, confirm they will merge, then undo.  once they can all merge, i under the merge but keep the changes and extract the volume.  Each model can have unique challenges, so sharing yours can help us assist you.
 

[Chris Bytheway]

Hi Ethan Rabinowitz and Subashni it was the geometry as you have stated. A very thin line that would not merge to forma  solid within DL. I have now fixed the model and all is fine. Would be nice if DL highlighted the 'Bad' areas so they are easier to find.