[GiDlist] RE: Problems with move point and arcline

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HRYB Damian Emmanuel CINI

[GiDlist] RE: Problems with move point and arcline

Post by HRYB Damian Emmanuel CINI »

But, if the arc define two surfaces and these surfaces define four volume,
I'd have to create all entities again.
Is there another option??

Damián

----- Original Message -----
From: "Enrique Escolano" escolano at cimne.upc.es
To: gidlist at gatxan.cimne.upc.es
Subject: Re: [GiDlist] Problems with move point and arcline
Date: Tue, 7 Sep 2004 14:57:15 +0200
Reply-To: gidlist at gid.cimne.upc.es

Instead to "deform" the previous arc with "move point", you can simply
create a new arc and delete the old one.

Enrique

----- Original Message -----
From: "HRYB Damian Emmanuel CINI" SIDHRY at siderca.com
To: gidlist at gatxan.cimne.upc.es
Sent: Monday, September 06, 2004 7:08 PM
Subject: [GiDlist] Problems with move point and arcline


Hi gid list,
I draw an arcline defined by 3 points, then I need to modify the arcline
shape and dimension using move point but I just have access to 2 arc
points.
If I move that 2 points I don't obtain the desired arc. What can I do?

Damián
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist

Enrique Escolano

[GiDlist] RE: Problems with move point and arcline

Post by Enrique Escolano »

It does'nt exists other options.
In other hand, the move point option only must be used with "small"
displacements, because
it's not possible to deform the dependent lines and surfaces in a compatible
mode.

Note: you can try a "dark" trick to change your arcline for another similar
curve:
Create the new curve with an identifier number smaller than the old arcline,
and collapse this two curves with the appropiate tolerance, then the curve
with higher numeration is changed by the other.
For example, before to create the new arc, you can force his identifier
number to be 1
geometry create arc number 1 ...
Then set the preference Import tolerance value to be a little big that the
maximum distance between this curves
and collapse them (menu Utilities-Collapse-Lines), and restore the Import
tolerance value.

Regards
Enrique
----- Original Message -----
From: "HRYB Damian Emmanuel CINI" SIDHRY at siderca.com
To: gidlist at gatxan.cimne.upc.es
Sent: Wednesday, September 08, 2004 2:15 PM
Subject: [GiDlist] RE: Problems with move point and arcline


But, if the arc define two surfaces and these surfaces define four volume,
I'd have to create all entities again.
Is there another option??

Damián

----- Original Message -----
From: "Enrique Escolano" escolano at cimne.upc.es
To: gidlist at gatxan.cimne.upc.es
Subject: Re: [GiDlist] Problems with move point and arcline
Date: Tue, 7 Sep 2004 14:57:15 +0200
Reply-To: gidlist at gid.cimne.upc.es

Instead to "deform" the previous arc with "move point", you can simply
create a new arc and delete the old one.

Enrique

----- Original Message -----
From: "HRYB Damian Emmanuel CINI" SIDHRY at siderca.com
To: gidlist at gatxan.cimne.upc.es
Sent: Monday, September 06, 2004 7:08 PM
Subject: [GiDlist] Problems with move point and arcline


Hi gid list,
I draw an arcline defined by 3 points, then I need to modify the arcline
shape and dimension using move point but I just have access to 2 arc
points.
If I move that 2 points I don't obtain the desired arc. What can I do?

Damián
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist

_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist

Philippe Bouchilloux

[GiDlist] Problem with the Collapse Model feature

Post by Philippe Bouchilloux »

Hello:

Recently, I have encountered a problem that, I think, is linked to the
Collapse Model feature in GiD.

The attached file is in Parasolid format, and was generated from SolidWorks.

If you import it in GiD (I tried 7.2 and 7.4.9b, with nicer results in
7.4.9b), it seems to generate a correct geometry, which essentially is a
square plate.

The SolidWorks model was created with 8 duplicated surfaces (the surfaces
that form the first central ring in the plate).

After import, I use the Collapse Model feature to remove these surfaces. I
have to manually change the import tolerance, because the default value is
too small, which is surprising (this is the first time I have this
situation). Additionally, this behavior is unchanged even if I scale up the
geometry (using Utilities | Move | Scale).

Once the 8 surfaces are removed by the Collapse Model feature, the geometry
"looks" fine.

However, if you mesh it using the structured mesh generator with quadratic
elements, and apply 2 subdivisions everywhere except in the thickness
direction where you apply 3 subdivisions, then you will clearly see that
the elements being generated are malformed at the level of the first
central ring.

This leads me to think that the Collapse feature has done something
"strange" to the volumes that are attached to that first central ring where
the surfaces were removed (maybe topological errors), which causes the
mesher to create bad elements.

Note that this problem won't happen if you delete all volumes and have GiD
regenerate the volumes, or if you do not collapse the model.

Maybe the issue is caused by the Parasolid import filter? In this case, can
you recommend a version number for that format (SolidWorks can export in
several different versions of that format)?

Thanks for your inputs.

Regards,

Philippe
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Enrique Escolano

[GiDlist] Problem with the Collapse Model feature

Post by Enrique Escolano »

It seems that exists a problem to calculate some surface center, and then
this surfaces with too different center are not collapsed (it's necessary a
very big tolerance).
This import problem is not related to the file Parasolid version. Can try to
export using another format, as IGES.

Regards
Enrique Escolano

----- Original Message -----
From: "Philippe Bouchilloux" pb at magsoft-flux.com
To: "GiDList" gidlist at gatxan.cimne.upc.es
Cc: "Larry Clayton" lclayton at edoceramic.com
Sent: Thursday, September 09, 2004 6:12 PM
Subject: [GiDlist] Problem with the Collapse Model feature


Hello:

Recently, I have encountered a problem that, I think, is linked to the
Collapse Model feature in GiD.

The attached file is in Parasolid format, and was generated from
SolidWorks.

If you import it in GiD (I tried 7.2 and 7.4.9b, with nicer results in
7.4.9b), it seems to generate a correct geometry, which essentially is a
square plate.

The SolidWorks model was created with 8 duplicated surfaces (the surfaces
that form the first central ring in the plate).

After import, I use the Collapse Model feature to remove these surfaces. I
have to manually change the import tolerance, because the default value is
too small, which is surprising (this is the first time I have this
situation). Additionally, this behavior is unchanged even if I scale up
the
geometry (using Utilities | Move | Scale).

Once the 8 surfaces are removed by the Collapse Model feature, the
geometry
"looks" fine.

However, if you mesh it using the structured mesh generator with quadratic
elements, and apply 2 subdivisions everywhere except in the thickness
direction where you apply 3 subdivisions, then you will clearly see that
the elements being generated are malformed at the level of the first
central ring.

This leads me to think that the Collapse feature has done something
"strange" to the volumes that are attached to that first central ring
where
the surfaces were removed (maybe topological errors), which causes the
mesher to create bad elements.

Note that this problem won't happen if you delete all volumes and have GiD
regenerate the volumes, or if you do not collapse the model.

Maybe the issue is caused by the Parasolid import filter? In this case,
can
you recommend a version number for that format (SolidWorks can export in
several different versions of that format)?

Thanks for your inputs.

Regards,

Philippe

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