Best way to get rid of unwanted elements

Altair Forum User

There are unwanted elements in the interior of the object that we scanned and I want to get rid of it. But I'm not really sure on even how to select the particular piece. Think a hollow box with something inside, and if I do try to select it I end up selecting the box too...

 

Sorry, I'm totally new at this.

Rahul_P1

HI,

 

Can you put up an image of the model? 

 

You may have to use, elements by face (select one of the elements > click on the yellow elements selector then choose face in the extended menu ) 

 

See - 

HyperWorks Desktop Applications > HyperWorks Desktop Overview > Input Controls > Entity Selector:

Advanced Menu Selection

Altair Forum User

If I know the id of one node or (surface element ) on the surface, is it possible to select all the surface elements  on the side face by tcl script?

I checked the command record, it seems hypermesh only returned the elements id(after some algorithms) on the same surface without telling me how.

Thanks!

 

tinh

Yes, first get surface id that the node's laying on:

set surf_id [hm_getentityvalue nodes $NodeId surfaceid 0]

then get elements on that surface:

*createmark elems 1 'by surface' $surf_id

set ElemList [hm_getmark elems 1]

Altair Forum User

Altair Forum User said:

Yes, first get surface id that the node's laying on:

set surf_id [hm_getentityvalue nodes $NodeId surfaceid 0]

then get elements on that surface:

*createmark elems 1 'by surface' $surf_id

set ElemList [hm_getmark elems 1]

Hi Tinh, thanks for your reply!

To use the surface as a bridge is a good idea.But if there is no surface--only thing I have is the triangle surface mesh by imported the stl or nas file.

and meanwhile the triangle mesh surface is toooo complicated that  to rebuild a surface is impossible.

Do you know how to do this?

Thanks!

 

tinh

Sure if there is no surface you cannot select elems on it

Altair Forum User

Altair Forum User said:

Sure if there is no surface you cannot select elems on it

Hi Tinh,

Thank you for your quick reply.

I noticed that in the GUI, even though one don't have a geometry surface, one still can first select one element on the meshed face, and then use 'by face' to select all the elements on the same face when the angles from element to element didn't vary too much. So what I mean is this is operational from GUI and should be very useful by script which I don't know how.

How do you think? Thanks!

tinh

ah, it's very easy to do that by script, example

*createmark elems 1 $First_ElemID

*featureangleset 30; #default is 30D but you can change it

*appendmark elems 1 'by face'

set ElemOnFace [hm_getmark elems 1]

 

Altair Forum User

Altair Forum User said:

ah, it's very easy to do that by script, example

*createmark elems 1 $First_ElemID

*featureangleset 30; #default is 30D but you can change it

*appendmark elems 1 'by face'

set ElemOnFace [hm_getmark elems 1]

 

Thank you very much Tinh!