## [GiDlist] Error in constructor

Moderator: GiD Team

Seungil Kim

### [GiDlist] how to create a surface on a sphere

Actually, what I would like to do is to make a volume
which is obtained by cutting a pyramid with a sphere centered at a vertex
of the pyramid.
So the five sides of the volume are on planes but one is a spherical
surface.
I tried to use the copy tool but the rotation of a curve on the sphere
could not produce the full spherical surface..
Is there an easy way to construct that kind of volume?

Thank you,
Seungil.

On Sat, Nov 23, 2013 at 12:29 AM, Enrique Escolano
escolano at cimne.upc.eduwrote:

If you create a surface defined only ‘by its boundary lines’ then the
shape of the surface must match these lines, but the inner shape is freely
created (by a kind of coons or bicubical interpolation). It shape won’t
necessarily be what you are expecting, e.g. won’t be spherical

You can create a perfect spherical surface by revolution with extrusion
(copy tool),

but you must know its revolution axis (two coordinates to define it), and
have some curve on the surface to be extruded (e.g. an arc)

If the ‘full surface’ doesn’t has the required lines as boundary, then you
can create a trimmed surface, trimming the ‘base surface’ with its boundary
lines.

Enrique

*De:* gidlist-bounces at listas.cimne.upc.edu [mailto:
gidlist-bounces at listas.cimne.upc.edu] *En nombre de *Seungil Kim
*Enviado el:* viernes, 22 de noviembre de 2013 16:11
*Para:* gidlist at listas.cimne.upc.edu
*Asunto:* [GiDlist] how to create a surface on a sphere

Dear Sir,

I have four curves on a unit sphere.

When I used "Create NURBS surface" to create a surface bounded by the four
curves,
I expected a surface on a surface but it doesn't seem to be a part of
sphere..

Is it possible to create a spherical surface when the four bounding curves
are on a sphere?

Thanks,

Seungil.

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

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escolano
Posts: 1566
Joined: Thu Sep 18, 2014 3:31 pm

### [GiDlist] how to create a surface on a sphere

I think that the easiest way is to create a volume of the pyramid, then
create a sphere centered at its vertex (Geometry-Create-Object-Sphere)

and then do a Boolean operation to have its intersection volume
(Geometry-Edit-Volume Boolean op-Intersection) and select both volumes.

Enrique

De: gidlist-bounces at listas.cimne.upc.edu
[mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de Seungil Kim
Enviado el: lunes, 25 de noviembre de 2013 11:13
Para: gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] how to create a surface on a sphere

Actually, what I would like to do is to make a volume
which is obtained by cutting a pyramid with a sphere centered at a vertex of
the pyramid.

So the five sides of the volume are on planes but one is a spherical
surface.

I tried to use the copy tool but the rotation of a curve on the sphere could
not produce the full spherical surface..

Is there an easy way to construct that kind of volume?

Thank you,

Seungil.

On Sat, Nov 23, 2013 at 12:29 AM, Enrique Escolano escolano at cimne.upc.edu
wrote:

If you create a surface defined only 'by its boundary lines' then the shape
of the surface must match these lines, but the inner shape is freely created
(by a kind of coons or bicubical interpolation). It shape won't necessarily
be what you are expecting, e.g. won't be spherical

You can create a perfect spherical surface by revolution with extrusion
(copy tool),

but you must know its revolution axis (two coordinates to define it), and
have some curve on the surface to be extruded (e.g. an arc)

If the 'full surface' doesn't has the required lines as boundary, then you
can create a trimmed surface, trimming the 'base surface' with its boundary
lines.

Enrique

De: gidlist-bounces at listas.cimne.upc.edu
[mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de Seungil Kim
Enviado el: viernes, 22 de noviembre de 2013 16:11
Para: gidlist at listas.cimne.upc.edu
Asunto: [GiDlist] how to create a surface on a sphere

Dear Sir,

I have four curves on a unit sphere.

When I used "Create NURBS surface" to create a surface bounded by the four
curves,
I expected a surface on a surface but it doesn't seem to be a part of
sphere..

Is it possible to create a spherical surface when the four bounding curves
are on a sphere?

Thanks,

Seungil.

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

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Mark Smith

### [GiDlist] Gid problem type display error

I have a problem type which displayed OK in gid 7 and gid 9 but now the images wont display properly, Can I send the problem type to somebody rather than posting it ti the group?

I'm evaluating GiD 11 (used ver 7 & 9 for many years) where the type of geometry I will be dealing with is complex with multiple bodies created in solidworks. there will be many surfaces that overlay one another most likely only parts of the 2 surfaces are common, is there a way of pre-processing them in gid where features on each of the surfaces intersect both surfaces and leave only 1 common surface between 2 bodies. I could do this manually either in solidworks by splitting the surfaces or in GiD but would prefer an automatic method?

So that when I mesh I get a matching mesh at the common surfaces?

I use COMSOL and this recognises common faces with any detail on them being imposed on the common face with no duplicate surfaces, I’d like to be able to do the same in GiD if possible?

Regards
Mark
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amelendo
Posts: 57
Joined: Tue Sep 16, 2014 2:20 pm

### [GiDlist] Gid problem type display error

Hi Mark,
Send me the problemtype to my email adress amelendo at cimne.upc.edu , I
will take a look to your images problem.

Regarding overlay surfaces, GiD have the option
Geometry-Edit-Collapse-Model within a tolerance.

Regards,

El 25/11/2013 15:32, Mark Smith escribió:
I have a problem type which displayed OK in gid 7 and gid 9 but now
the images wont display properly, Can I send the problem type to
somebody rather than posting it ti the group?
I'm evaluating GiD 11 (used ver 7 & 9 for many years) where the type
of geometry I will be dealing with is complex with multiple bodies
created in solidworks. there will be many surfaces that overlay one
another most likely only parts of the 2 surfaces are common, is there
a way of pre-processing them in gid where features on each of the
surfaces intersect both surfaces and leave only 1 common surface
between 2 bodies. I could do this manually either in solidworks by
splitting the surfaces or in GiD but would prefer an automatic method?
So that when I mesh I get a matching mesh at the common surfaces?
I use COMSOL and this recognises common faces with any detail on them
being imposed on the common face with no duplicate surfaces, I'd like
to be able to do the same in GiD if possible?
Regards
Mark

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

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amelendo
Posts: 57
Joined: Tue Sep 16, 2014 2:20 pm

### [GiDlist] Gid problem type display error

I misunderstood Mark 's surface problem
Here is an example (2 independent boxes):

Solution for easy geometries goes trough:
First: Geometry-Edit-Intersection-Surfaces, 1:end
And after: Geometry-Edit-Collapse-Model within a appropriate tolerance.
If this actions are commonly used, you can do a macro to execute
automatically all steps of this process:

(easy geometries = intersection it's well defined)

Regards,

El 25/11/2013 15:45, Adria Melendo escribió:
Hi Mark,
Send me the problemtype to my email adress amelendo at cimne.upc.edu , I
will take a look to your images problem.

Regarding overlay surfaces, GiD have the option
Geometry-Edit-Collapse-Model within a tolerance.

Regards,

El 25/11/2013 15:32, Mark Smith escribió:
I have a problem type which displayed OK in gid 7 and gid 9 but now
the images wont display properly, Can I send the problem type to
somebody rather than posting it ti the group?
I'm evaluating GiD 11 (used ver 7 & 9 for many years) where the type
of geometry I will be dealing with is complex with multiple bodies
created in solidworks. there will be many surfaces that overlay one
another most likely only parts of the 2 surfaces are common, is there
a way of pre-processing them in gid where features on each of the
surfaces intersect both surfaces and leave only 1 common surface
between 2 bodies. I could do this manually either in solidworks by
splitting the surfaces or in GiD but would prefer an automatic method?
So that when I mesh I get a matching mesh at the common surfaces?
I use COMSOL and this recognises common faces with any detail on them
being imposed on the common face with no duplicate surfaces, I'd like
to be able to do the same in GiD if possible?
Regards
Mark

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

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