2004-september.txt

acis说明文档

From: PG02104852 at ntu.edu.sg (#TANG SHAOHUI#)
Date: Tue Sep 14 04:02:14 2004
Subject: [Acis-alliance] how to remove faces and repair body?
Message-ID: <[e-mail]>

hi, everyone

I am trying to use api_remove_and_repair_body or api_remove_faces to remove faces and reconstruct body but failed with an error. following is my program, can you kindly tell me what's wrong with it or give me an example on how to use these api functions? I am using ACIS 7.0.
 
 ENTITY_LIST f_element;
 ENTITY_LIST n_face_list;
 ATTRIB* mylabel;
 
 result = api_get_faces(save_part, n_face_list);
                check_outcome(result, "Error geting face list");
 
 for(int i=0; i<n_face_list.count(); i++)  
{
  mylabel=n_face_list[i]->attrib();
  ATTRIB_BLOCKLABEL* new_label = (ATTRIB_BLOCKLABEL*)mylabel;
  ENTITY* label_owner= new_label->get_featureid();
  if(label_owner==(ENTITY*)myblock_attrib1) 
    {   
     f_element.add(n_face_list[i]); 
    }
 }
 cout<<f_element.count()<<endl;
 
 FACE*  d_face[10];
 for(i=0; i< f_element.count(); i++)
 { d_face[i]= (FACE*)f_element[i];
 cout<< d_face[i]<<endl;
 }
 
 position box_low;
 position box_high;
 result= api_remove_faces(f_element.count(),  d_face, box_low, box_high);
 check_outcome(result, "Error delete faces"); 
 
error occured as: error 6015, Acess violation

best regards
shaohui


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From Samuel.Mazel at cedrat.com  Tue Sep 14 10:37:47 2004
From: Samuel.Mazel at cedrat.com (Samul Mazel)
Date: Tue Sep 14 10:35:22 2004
Subject: [Acis-alliance] Allocating Memory
Message-ID: <005b01c49a68$67703660$[e-mail]>

Hi

    I try to allocate a matrix of faces like that
    FACE ***matFaces = ACIS_NEW FACE**[10];
    VC++ accept at the compilation
    but when access to, during runing,
    matFaces[0][0] = block->lump()->shell()->face();
    say Access violation !!
    I can allocate a simple table
    FACE **tabFace = ACIS_NEW FACE*[10];
    It's possible to use a "matrix" of entities ? and if Yes how allocate ?
    thanks
    Samuel

From alames at sandia.gov  Tue Sep 14 10:59:37 2004
From: alames at sandia.gov (Ames, Arlo)
Date: Tue Sep 14 11:00:23 2004
Subject: [Acis-alliance] how to set color or material information to
	a n entity
Message-ID: <[e-mail]>

If you want an attribute to survive boolean operations, you need to ensure
the following:  that the attribute class has member functions that support
boolean operations, and that the attribute code is linked in the application
performing the booleans.  Member functions, such as split_owner and
merge_owner, are called during boolean operations -- if you write
appropriate content, you can ensure that the attribute is copied through the
operation.  ACIS aupports the notion of attributes that don't have their
class definitions linked into the application -- such attributes are
essentially "dead", copied through if their owning entities are left
unmodified, with somewhat arbitrary-seeming results if their owners are
modified.

In the end, writing your own attributes is the only way to ensure that the
split and merge functions are written as you want them, and you need to be
sure your attribute code is linked into whatever applications are being used
to operate on the geometry you're interested in.

Arlo Ames
[e-mail]

-----Original Message-----
From: Sanjay Kumar [mailto:[e-mail]] 
Sent: Tuesday, September 14, 2004 6:14 AM
To: Ames, Arlo
Subject: RE: [Acis-alliance] how to set color or material information to a n
entity


hello,
 i would like to thank you for your valuable inputs. i used ATTRIB_COL 
which allows to set color to individual entities within the same part. i 
set color to individual entities and then add them to a list before i write 
it to a sat file. this way the color features are maintaited, but however 
if i perform a boolean operation of two entities then the color info is 
lost. can you give me some suggestions on how to overcome this problem. i 
think i have to mention the attribute properties to be kept after the bool 
operation. some code snippets would be very useful. i really appreciate you 
help.
 thanks,
 sanjay


--On Thursday, September 09, 2004 8:21 AM -0600 "Ames, Arlo" 
<[e-mail]> wrote:

> Are you trying to color objects for your own application, or feed 
> color information to other applications?  If the former, any attribute 
> will do
> -- define your own from scratch or use the generic attribute mechanisms.
> If the latter, you need to use whatever attribute structure is used by the
> application in question.
>
> Arlo Ames
> [e-mail]
>
> -----Original Message-----
> From: Sanjay Kumar [mailto:[e-mail]]
> Sent: Wednesday, September 08, 2004 8:28 PM
> To: [e-mail]
> Subject: [Acis-alliance] how to set color or material information to 
> an entity
>
>
> hi alliance grp members,
>  i need to set color to various entities stored ina single SAT file. 
> i'm not able to use the RH_MATERIAL or ATTRIB_COL components of ENTITY 
> class (Rendering base component). Any comments or suggestions throwing 
> light on how to set these properties to a part will be very useful. 
> i'm using ACIS R13SP5 with visual c++ 6.0
>
>  thanks,
>  sanjay
>
>
>
>
> _______________________________________________
> Acis-alliance mailing list
> [e-mail] 
> http://lists.cs.columbia.edu/mailman/listinfo/acis-alliance
>
>



Sanjay Kumar P,
Graduate Student,
Department of Industrial Engineering,
University at Buffalo, The State University of New York,
339, Bell Hall,
Buffalo, New York 14260-2050
E-mail: [e-mail]
Tel: [phone] Ext.2163


From alames at sandia.gov  Tue Sep 14 11:03:51 2004
From: alames at sandia.gov (Ames, Arlo)
Date: Tue Sep 14 11:04:17 2004
Subject: [Acis-alliance] Allocating Memory
Message-ID: <[e-mail]>

Your question isn't an ACIS question, but a C/C++ question.
Try this:
FACE *** matFaces = ACIS_NEW FACE**[10];
for (int i = 0; i < 10; i++)
{
   matFaces[i] = ACIS_NEW FACE*[10];
   for (int j = 0; j < 10; j++)
   {
      matFaces[i][j] = block->lump...
   }
}
-----Original Message-----
From: Samul Mazel [mailto:[e-mail]] 
Sent: Tuesday, September 14, 2004 8:38 AM
To: [e-mail]
Subject: [Acis-alliance] Allocating Memory


Hi

    I try to allocate a matrix of faces like that
    FACE ***matFaces = ACIS_NEW FACE**[10];
    VC++ accept at the compilation
    but when access to, during runing,
    matFaces[0][0] = block->lump()->shell()->face();
    say Access violation !!
    I can allocate a simple table
    FACE **tabFace = ACIS_NEW FACE*[10];
    It's possible to use a "matrix" of entities ? and if Yes how allocate ?
    thanks
    Samuel

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[e-mail]
http://lists.cs.columbia.edu/mailman/listinfo/acis-alliance

From e_wwg at 163.com  Thu Sep 23 05:04:04 2004
From: e_wwg at 163.com (=?gb2312?B?ZV93d2c=?=)
Date: Thu Sep 23 05:04:06 2004
Subject: [Acis-alliance] About api_cover_wires
Message-ID: <[e-mail]>

Hi,all
    I have some ploblems when i use the api_cover_wires fuction. i tried to draw the side face of a cylinder(i read the data form a constructed model and i want to reconstruct it myself):
    First i draw all the edge of the top and bottom loop(both external) then unit them as two wire bodys--a top one and a bottom one; then use api_cover_wires fuction to make a face. it works well when the edges are consist of circles or ellipse, but when one of these edges happens to be a intcurve, or a straight sometimes, it fails! 
    I guess it may be because that i make these intcurves using the api_mk_ed_int_ctrlpts fuction(these intcurves can be drawn well). These intcurves are intersectant curves of two faces, and i know that in the .sat file when it record an intcurve it also record the intersectant faces' geometry feature(cone or plane...).
    Then I want to get the data of these intersectant faces from the intcurve. 
--------------------------------------------------------------------------------------
    EDGE* eg = (the intcurve i have got)
      CURVE * GeoCurve = eg->edge()->geometry();
      curve const & EqtCurve = GeoCurve->equation();
      intcurve* ic = (intcurve*&)EqtCurve;
      if(ic != NULL)
          surface const & tempsurf = ic->surf1();
--------------------------------------------------------------------------------------
It breaks out at the last line. It seems as if it cannot access the members of "ic"(ic != NULL), and I donnot know what to do.
I have seen that someone said that the function of api_cover_faces is very limited, but is there some other APIs I can chose?
It also meet problems some times.

Any help will be appreciated! Thanks in advance!

Weiguo Wang
Shandong University, China
2004-9-23



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From davidkou at hkusua.hku.hk  Fri Sep 24 02:20:30 2004
From: davidkou at hkusua.hku.hk (David)
Date: Fri Sep 24 02:21:00 2004
Subject: [Acis-alliance] Re: About api_cover_wires
Message-ID: <[e-mail]>

Dear Weiguo，

If you just want to draw (render) the side surface, I suggest you use other functions. e.g.

//[1] Construct a cylinder use whatever functions you like:
	BODY *pCylinder;
	api_make_frustum(, , , , pCylinder);
//[2] Get the side face
	FACE * pSideFace;
	ENTITY_LIST FaceList;
	api_get_faces(pCylinder,FaceList);
	FaceList.init();	
	ENTITY* pFace=FaceList.next();
	while(pFace!=NULL) 
	{
		if(is_cylindrical_face(pFace))
		{
		    pSideFace=pFace;
			break;
		}
		pFace=FaceList.next();
	}
//[3] Facet the side face with polygons:
	api_facet_face(pSideFace);
//[4] Use opengl etc. to render it:
	...

Hope this helps.