[GiDlist] nurbs data

Moderator: GiD Team

Hoang Giang Bui

[GiDlist] nurbs data

Postby Hoang Giang Bui » Sun Sep 15, 2013 10:04 am

Dear Gid list,

I'm interested in reading NURBS data in GID problem type. For example to
write custom calculation file using customization command specialized
for .bas file. The problem is that I don't want the mesh from GID, I
want to access raw geometrical data using GID command in .bas file. Does
anyone has any idea on how to achieve this?

BR
Giang Bui
User avatar
amelendo
Posts: 57
Joined: Tue Sep 16, 2014 2:20 pm

[GiDlist] nurbs data

Postby amelendo » Mon Sep 16, 2013 8:26 am

Dear Giang Bui,
The only way to access to geometrical data is using a tcl command.
To get information of surfaces you must use:

GiD_Geometry get surface 3
( 3 = num of surface you are interested on )
more info here:
http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_extension/special_tcl_commands/geometry

or:

GiD_Info list_entities surfaces 3
( 3 = num of surface you are interested on )
more info here:
http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_extension/gid_info_function/list_entities


If you want to do it on a .bas , you must use: *tcl (that is a special
command that let you execute any tcl expression)
You can define your own tcl procedures on .tcl file

*In the .bas file:*
*set var num=3
*tcl(WriteSurfaceInfo *num)

*In the .tcl file:*
proc WriteSurfaceInfo { num } {
return [GiD_Info list_entities surfaces $num]
}


more info here:
http://www.gidhome.com/component/manual/customizationmanual/template_files/commands_used_in_the_bas_file/specific_commands

Regards,
Adrià


El 15/09/2013 11:04, Hoang Giang Bui escribió:
Dear Gid list,

I'm interested in reading NURBS data in GID problem type. For example to
write custom calculation file using customization command specialized
for .bas file. The problem is that I don't want the mesh from GID, I
want to access raw geometrical data using GID command in .bas file. Does
anyone has any idea on how to achieve this?

BR
Giang Bui

_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist


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User avatar
escolano
Posts: 1568
Joined: Thu Sep 18, 2014 3:31 pm

[GiDlist] nurbs data

Postby escolano » Mon Sep 16, 2013 9:47 am

As Adrià said, you must use Tcl commands to get the NURBS information,



Instead of

GiD_Info list_entities

I recommend you the more specialized GiD-Tcl command GiD_Geometry

e.g.

GiD_Geometry get surface $num



Enrique



De: gidlist-bounces at listas.cimne.upc.edu
[mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de Adria Melendo
Enviado el: lunes, 16 de septiembre de 2013 9:26
Para: gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] nurbs data



Dear Giang Bui,
The only way to access to geometrical data is using a tcl command.
To get information of surfaces you must use:

GiD_Geometry get surface 3
( 3 = num of surface you are interested on )
more info here:
http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_exten
sion/special_tcl_commands/geometry

or:

GiD_Info list_entities surfaces 3
( 3 = num of surface you are interested on )
more info here:
http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_exten
sion/gid_info_function/list_entities


If you want to do it on a .bas , you must use: *tcl (that is a special
command that let you execute any tcl expression)
You can define your own tcl procedures on .tcl file

In the .bas file:
*set var num=3
*tcl(WriteSurfaceInfo *num)

In the .tcl file:
proc WriteSurfaceInfo { num } {
return [GiD_Info list_entities surfaces $num]
}


more info here:
http://www.gidhome.com/component/manual/customizationmanual/template_files/c
ommands_used_in_the_bas_file/specific_commands

Regards,
Adrià


El 15/09/2013 11:04, Hoang Giang Bui escribió:


Dear Gid list,

I'm interested in reading NURBS data in GID problem type. For example to
write custom calculation file using customization command specialized
for .bas file. The problem is that I don't want the mesh from GID, I
want to access raw geometrical data using GID command in .bas file. Does
anyone has any idea on how to achieve this?

BR
Giang Bui

_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist




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Hoang Giang Bui

[GiDlist] nurbs data

Postby Hoang Giang Bui » Sun Oct 20, 2013 1:10 am

Thanks. I can use this technique to generate a data file for NURBS.
However, I don't understand how GID generate a NURBS surface by tensor
product of 2 NURBS curve. I created a NURBS surface on 2D by contour lines
but the result is just a rectangle, although the screen showed a seemingly
correct surface. May I know why ?

Bui



On Mon, Sep 16, 2013 at 10:47 AM, Enrique Escolano
escolano at cimne.upc.eduwrote:

As Adrià said, you must use Tcl commands to get the NURBS information,****

** **

Instead of ****

GiD_Info list_entities****

I recommend you the more specialized GiD-Tcl command GiD_Geometry****

e.g. ****

GiD_Geometry get surface $num****

** **

Enrique****

** **

*De:* gidlist-bounces at listas.cimne.upc.edu [mailto:
gidlist-bounces at listas.cimne.upc.edu] *En nomb**re de *Adria Melendo
*Enviado el:* lunes, 16 de septiembre de 2013 9:26
*Para:* gidlist at listas.cimne.upc.edu
*Asunto:* Re: [GiDlist] nurbs data****

** **

Dear Giang Bui,
The only way to access to geometrical data is using a tcl command.
To get information of surfaces you must use:

GiD_Geometry get surface 3
( 3 = num of surface you are interested on )
more info here:
http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_extension/special_tcl_commands/geometry

or:

GiD_Info list_entities surfaces 3
( 3 = num of surface you are interested on )
more info here:
http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_extension/gid_info_function/list_entities


If you want to do it on a .bas , you must use: *tcl (that is a special
command that let you execute any tcl expression)
You can define your own tcl procedures on .tcl file

*In the .bas file:*
*set var num=3
*tcl(WriteSurfaceInfo *num)

*In the .tcl file:*
proc WriteSurfaceInfo { num } {
return [GiD_Info list_entities surfaces $num]
}


more info here:
http://www.gidhome.com/component/manual/customizationmanual/template_files/commands_used_in_the_bas_file/specific_commands

Regards,
Adrià


El 15/09/2013 11:04, Hoang Giang Bui escribió:****

** **

Dear Gid list,****

** **

I'm interested in reading NURBS data in GID problem type. For example to ****

write custom calculation file using customization command specialized ****

for .bas file. The problem is that I don't want the mesh from GID, I ****

want to access raw geometrical data using GID command in .bas file. Does ****

anyone has any idea on how to achieve this?****

** **

BR****

Giang Bui****

** **

_______________________________________________****

GiDlist mailing list****

GiDlist at listas.cimne.upc.edu****

http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist****

** **

** **

_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist




--
With Best Regards !
Giang Bui
To learn and to excel
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User avatar
escolano
Posts: 1568
Joined: Thu Sep 18, 2014 3:31 pm

[GiDlist] nurbs data

Postby escolano » Mon Oct 21, 2013 9:55 am

Because it is a ‘trimmed NURBS surface’,

The underlying shape is provided by the full NURBS surface, in this case a plane defined by a NURBS of degree 1 with only 4 control points

And the ‘valid shape’ is the region inside the trimming curves, that are its boundary lines.



When creating the surface by boundary, it the boundary has ‘4 sides’ (4 strong corners) you can force GiD to create a ‘untrimmed NURBS surface’,

During the surface creation open the contextual menu (click right mouse button) and select ‘No try planar’

and then select the boundary lines to create the surface.



Enrique



De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de Hoang Giang Bui
Enviado el: domingo, 20 de octubre de 2013 2:11
Para: gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] nurbs data



Thanks. I can use this technique to generate a data file for NURBS. However, I don't understand how GID generate a NURBS surface by tensor product of 2 NURBS curve. I created a NURBS surface on 2D by contour lines but the result is just a rectangle, although the screen showed a seemingly correct surface. May I know why ?

Bui



On Mon, Sep 16, 2013 at 10:47 AM, Enrique Escolano escolano at cimne.upc.edu wrote:

As Adrià said, you must use Tcl commands to get the NURBS information,



Instead of

GiD_Info list_entities

I recommend you the more specialized GiD-Tcl command GiD_Geometry

e.g.

GiD_Geometry get surface $num



Enrique



De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de Adria Melendo
Enviado el: lunes, 16 de septiembre de 2013 9:26
Para: gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] nurbs data



Dear Giang Bui,
The only way to access to geometrical data is using a tcl command.
To get information of surfaces you must use:

GiD_Geometry get surface 3
( 3 = num of surface you are interested on )
more info here: http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_extension/special_tcl_commands/geometry

or:

GiD_Info list_entities surfaces 3
( 3 = num of surface you are interested on )
more info here: http://www.gidhome.com/component/manual/customizationmanual/tcl_and_tk_extension/gid_info_function/list_entities


If you want to do it on a .bas , you must use: *tcl (that is a special command that let you execute any tcl expression)
You can define your own tcl procedures on .tcl file

In the .bas file:
*set var num=3
*tcl(WriteSurfaceInfo *num)

In the .tcl file:
proc WriteSurfaceInfo { num } {
return [GiD_Info list_entities surfaces $num]
}


more info here: http://www.gidhome.com/component/manual/customizationmanual/template_files/commands_used_in_the_bas_file/specific_commands

Regards,
Adrià


El 15/09/2013 11:04, Hoang Giang Bui escribió:


Dear Gid list,

I'm interested in reading NURBS data in GID problem type. For example to
write custom calculation file using customization command specialized
for .bas file. The problem is that I don't want the mesh from GID, I
want to access raw geometrical data using GID command in .bas file. Does
anyone has any idea on how to achieve this?

BR
Giang Bui

_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist





_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist




--
With Best Regards !
Giang Bui

To learn and to excel

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