2003-november.txt

acis说明文档

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From alames at sandia.gov  Tue Nov 25 14:04:54 2003
From: alames at sandia.gov (Ames, Arlo)
Date: Tue Nov 25 16:05:25 2003
Subject: [Acis-alliance] Close gap between Edges
Message-ID: <[e-mail]>

Closing gaps is a genuine pain in the neck to get right.  This is one of the
principal reasons you buy the healing husk.  

You don't have to trim a curve, as the vertices limit the edge anyway.  I
haven't used api_trim_curve, but I suspect it changes the length of the
underlying curve (which is useful for efficiency), but doesn't really affect
your problem.

What's really going on is that the edges are either too short, or they are
skew in space.  If the curves happen to be straight (which are infinite),
they are unlikely to be too short.  More likely is the skew condition.

If I were fixing this, I would look at the curve definitions.  If they can
be intersected to provide posiitons near your original vertex positions, the
intersection positions can be substituted.  If not, you might be able to
modify the curve equations to provide curves that intersect the vertices.
For example, if I had a straight line that was supposed to go through two
positions, I might redefine the straight so that its position was one of the
vertex positions, and the vector was the difference of the two vertex
positions.

If you're dealing with a complete solid, and have to get all the
vertex/edge/surface coincidences right, you might seriously start with the
healing husk, as getting all the changes to be consistent is difficult.


Now, if you're not doing a lot of difficult geometric operations (e.g.
booleans), you might just ignore the error if it's sufficiently small.  You
can, for example, facet parts that have really large positional errors and
it works OK.  Just be aware that some of your geometric operations may fail
if you have such errors.


Of course, there is a cheap hack.  If the positional errors are
significantly smaller than the smallest feature of the part (e.g. smallest
radius of a circle, etc), you can sometimes get away with scaling the object
down.  do api_apply_transf(scale_transf(0.1)); api_change_body_trans(NULL);
api_apply_transf(scale_transf(10.0);.  The geometry of the part is now 10
times smaller, so the gaps are smaller.  The part has a transf on it to
scale it up 10 times larger.  DON'T do api_change_body_trans again, or
you're back where you started.  This will close up some gaps.

Good luck
Arlo Ames


-----Original Message-----
From: Alexander Muthler [mailto:[e-mail]]
Sent: Tuesday, November 25, 2003 12:04 PM
To: Acis-Alliance
Subject: [Acis-alliance] Close gap between Edges


Hello ACIS-Alliance,

I want to construct a loop of several edges. Adjacent edges should share
the same VERTEX. But some of of the edges have small gaps (>SPAresabs).
Does anybody have an idea how to close these gaps?
Can I use api_trim_curve(...)?
If yes, do you know how to construct the entity_with_ray, which is used
in this function?

Your help would be appreciated.

Best Regards,
Alex

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From fangzhihua422 at sina.com  Fri Nov 28 19:36:56 2003
From: fangzhihua422 at sina.com (fangzhihua422)
Date: Fri Nov 28 06:37:15 2003
Subject: [Acis-alliance]
Message-ID: <[e-mail]>

HI,everybody:
      in the following program,api_loop_external can not run correctly.the warning message is "Access violation".i don't know why.how can we use this function?
void CAcis4Doc::OnFaceSolid() 
{
  int depth = 0;
  api_part_start_state(depth);
  API_BEGIN
 
  BODY* block1=NULL;
  BODY* slot=NULL;
api_solid_block(position(0,0,0),position (40,20,20),block1,NULL); 
api_solid_block(position(10,5,15),position (25,15,20),slot,NULL);
 api_subtract(slot,block1);
 FACE* face;
 LOOP* lp;
 int loopc=0;
 api_find_face(block1,unit_vector(0,0,1),face);
 for(lp=face->loop();lp!=NULL;lp=lp->next())
 {
  loopc++;
  logical* a;
  outcome r2=api_loop_external(lp,a);
  if(!r2.ok())
  {
	err_mess_type err_number=r2.error_number();
	AfxMessageBox(find_err_mess(err_number));//a message box "Access violation"
  }
 }
 m_pAcisDoc->AddEntity(block1);

 API_END
 api_part_note_state( result, depth );
 m_pAcisDoc->InvalidateViews();		
}

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From fangzhihua422 at sina.com  Fri Nov 28 19:57:12 2003
From: fangzhihua422 at sina.com (fangzhihua422)
Date: Fri Nov 28 06:57:28 2003
Subject: [Acis-alliance]
Message-ID: <[e-mail]>

HI,everybody:
      in the following program,api_loop_external can not run correctly.the warning message is "Access violation".i don't know why.how can we use this function?
void CAcis4Doc::OnFaceSolid() 
{
  int depth = 0;
  api_part_start_state(depth);
  API_BEGIN
 
  BODY* block1=NULL;
  BODY* slot=NULL;
api_solid_block(position(0,0,0),position (40,20,20),block1,NULL); 
api_solid_block(position(10,5,15),position (25,15,20),slot,NULL);
 api_subtract(slot,block1);
 FACE* face;
 LOOP* lp;
 int loopc=0;
 api_find_face(block1,unit_vector(0,0,1),face);
 for(lp=face->loop();lp!=NULL;lp=lp->next())
 {
  loopc++;
  logical* a;
  outcome r2=api_loop_external(lp,a);
  if(!r2.ok())
  {
	err_mess_type err_number=r2.error_number();
	AfxMessageBox(find_err_mess(err_number));//a message box "Access violation"
  }
 }
 m_pAcisDoc->AddEntity(block1);

 API_END
 api_part_note_state( result, depth );
 m_pAcisDoc->InvalidateViews();		
}

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From muthler at bv.tum.de  Fri Nov 28 13:16:15 2003
From: muthler at bv.tum.de (Alexander Muthler)
Date: Fri Nov 28 07:16:32 2003
Subject: [Acis-alliance]
In-Reply-To: <[e-mail]>
Message-ID: <000001c3b5a9$6b592290$[e-mail]>

Hi,

try:
 
[...]
  logical a(FALSE);
  outcome r2=api_loop_external(lp, &a);
[...]

Regards,
Alex

 

> -----Original Message-----
> From: [e-mail] 
> [mailto:[e-mail]] On Behalf Of 
> fangzhihua422
> Sent: Friday, November 28, 2003 12:57 PM
> To: [e-mail]
> Subject: [Acis-alliance]
> 
> 
> HI,everybody:
>       in the following program,api_loop_external can not run 
> correctly.the warning message is "Access violation".i don't 
> know why.how can we use this function?
> void CAcis4Doc::OnFaceSolid() 
> {
>   int depth = 0;
>   api_part_start_state(depth);
>   API_BEGIN
>  
>   BODY* block1=NULL;
>   BODY* slot=NULL;
> api_solid_block(position(0,0,0),position (40,20,20),block1,NULL); 
> api_solid_block(position(10,5,15),position (25,15,20),slot,NULL);
>  api_subtract(slot,block1);
>  FACE* face;
>  LOOP* lp;
>  int loopc=0;
>  api_find_face(block1,unit_vector(0,0,1),face);
>  for(lp=face->loop();lp!=NULL;lp=lp->next())
>  {
>   loopc++;
>   logical* a;
>   outcome r2=api_loop_external(lp,a);
>   if(!r2.ok())
>   {
> 	err_mess_type err_number=r2.error_number();
> 	AfxMessageBox(find_err_mess(err_number));//a message 
> box "Access violation"
>   }
>  }
>  m_pAcisDoc->AddEntity(block1);
> 
>  API_END
>  api_part_note_state( result, depth );
>  m_pAcisDoc->InvalidateViews();		
> }
> 
> ______________________________________
> 
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> (http://ad4.sina.com.cn/shc/zhuiyu_hprefresh.h> tml)
> 
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> 
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> [e-mail]
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> 


From muthler at bv.tum.de  Fri Nov 28 14:25:17 2003
From: muthler at bv.tum.de (Alexander Muthler)
Date: Fri Nov 28 08:25:24 2003
Subject: [Acis-alliance] share geometry of entities
Message-ID: <000001c3b5b3$105168d0$[e-mail]>

Dear Acis-Alliance,

I have several BODYs (spline sheets) which are adjacent, but each
entitiy has ist own geometry. Is there a  method or function which
identifies the coincident CURVES or APOINTS and shares one of these with
one or more adjacent EDGES resp. VERTEXes.

Your help would be appreciated.

Best Regards,
Alex

From manoj_acis at yahoo.com  Sun Nov 30 11:22:17 2003
From: manoj_acis at yahoo.com (manoj j)
Date: Sun Nov 30 14:22:24 2003
Subject: [Acis-alliance] 
	How do I create ACIS object dynamically (using new operator)??
Message-ID: <[e-mail]>

Hi All
How do I create ACIS object dynamically (using new operator)??
I tried following:
position *p = new position;
which I think should work, but it gives an error saying, 
"error C2661: 'new' : no overloaded function takes 3 parameters"
Thanks in advance for your help.
Manoj.



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From manoj_acis at yahoo.com  Sun Nov 30 11:26:30 2003
From: manoj_acis at yahoo.com (manoj j)
Date: Sun Nov 30 14:26:40 2003
Subject: [Acis-alliance] URGENT: How to display "bs3_surface" in VC++.
In-Reply-To: <[e-mail]>
Message-ID: <[e-mail]>

 
Hi Ames, Arlo and All,

As per your (Ames, Arlo)  explanaion to my previous query "How to display a bs3_surface", I try to create a object of "spline" with bs3_surface that I have. 
 
Now the next question is to use this "spline" object to display the surface. For that I tried using "api_make_spline", but it gives an error. IF I check 'outcome' object returned by this api call, its "error_number" method has returned error number "6015". 
 
I will be very much thankful to you if you could guide me further to display this surface.
Thanks and Regards
Manoj.

"Ames, Arlo" <[e-mail]> wrote:
If you are trying to display the surface using builtin ACIS rendering commands, you might be failing because you aren't feeding it the right entity types.  The ACIS topology entities (BODY, LUMP, SHELL, FACE, LOOP, COEDGE, EDGE, VERTEX) are used to define solids.  Underlying FACE, we find SURFACE, and under SURFACE we find surface, of which bs3_surface is a subtype.  If you want to draw using builtin routines,
you need to build a FACE, maybe even a BODY containing a LUMP, containing a SHELL, containing a FACE.  The face will have a SURFACE which has your bs3_surface, and will require a LOOP, which consists of a ring of COEDGES, each of which has an EDGE, and adjacent EDGES in the ring of coedges share VERTEX entities.  THe EDGEs will have to have CURVEs, which correspond to the edges of your bs3_surface, and the VERTEXs will have APOINTS, whose coordinates are the same as the corners of your bs3_surface.
 
I leave it to you to find the functions to construct the topology.  There are a number of such functions, and which are appropriate depends on what you are doing.  I personally find that direct construction isn't a bad way to go, but there are a lot of api functions that result in shorter code that you might understand better.
 
A different approach is to find an api function that constructs the surface you need within the context of a FACE or a BODY.  Again, it's yours to search the documentation. 
 
Arlo Ames
[e-mail]
-----Original Message-----
From: manoj j [mailto:[e-mail]]
Sent: Wednesday, November 12, 2003 6:57 PM
To: [e-mail]
Subject: [Acis-alliance] URGENT: How to display "bs3_surface" in VC++.



Hi All,

I am a new to this ACIS & VC++ environment.  

I am using "bs3_surface" function in my code and want to display it. But I am finding it difficult. 

I am urgently required the help. I will appreciate your valuable help. If possible you could mail me some useful code that would enhance my knowledge.


Thanks,

Manoj



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From sbrooks2 at kc.rr.com  Sun Nov 30 14:45:32 2003
From: sbrooks2 at kc.rr.com (Steve Brooks)
Date: Sun Nov 30 15:45:50 2003
Subject: [Acis-alliance]	How do I create A