2003-may.txt

acis说明文档

From zhengshu.shen at asu.edu  Wed May  7 16:18:21 2003
From: zhengshu.shen at asu.edu (shen)
Date: Wed May  7 18:30:10 2003
Subject: [Acis-alliance] projection problem
Message-ID: <[e-mail]>

Hello everybody,
I have been combating a small problem for a while and have reached
nowhere, and
would appreciate help.
Essentially I have been trying to get the projected area of a body along
a certain
direction.  If anyone knows how please let me know.
Essentially if I am looking at  body from a certain direction, what is
the area of the
shadow cast by the body (parallel projection) or the area of the
bounding box of the
shadow, whichever is easier.
I have tried a number of approaches, but cannot seem to get the answer
Thank you so much.

--
================================================
Zhengshu Shen
================================================
Design Automation Lab
Mechanical & Aerospace Engineering
Mail code 6106, Arizona State University - Main
Tempe AZ 85287-6106
Phone: [phone](office)
   Fax: [phone]
Email: [e-mail]
===============================================
http://asudesign.eas.asu.edu/index.html


From aparajit at mail.utexas.edu  Thu May  8 12:58:22 2003
From: aparajit at mail.utexas.edu (Aparajit Pratap)
Date: Thu May  8 12:58:52 2003
Subject: [Acis-alliance] Grouping FACEs
Message-ID: <000001c31583$08bc40c0$d5550692@lffserv>

Hi, 

 

Is there anyway to group a number of FACEs on a BODY together and
combine them to form a new SHELL? Any help will be greatly appreciated.

 

Sincerely, 

 

Aparajit

 

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From alames at sandia.gov  Thu May  8 12:17:44 2003
From: alames at sandia.gov (Ames, Arlo)
Date: Thu May  8 13:18:10 2003
Subject: [Acis-alliance] projection problem
Message-ID: <[e-mail]>

I don't have the time to look up the function calls, but I'd approach this
by
first computing silhouette edges, and imprinting them into the body.  Then
I'd take each
face and project it's edges onto a plane, getting a (maybe
self-intersecting) region for
each face of the model.  Skip any faces that are everywhere perpendicular to
the projection
direction (unless your projection is perspective, in which case things are
worse).
Unite all the faces of the projections.  ACIS doesn't necessarily do great
2D booleans,
so you might want to extrude the faces and do solid intersections of 2-1/2 D
objects (again,
with a perspective transformation things are a bit more interesting).  Like
as not you'll 
end up with a lot of grazing cases that can complicate things.  

You might find a more direct approach involving just projecting each edge
onto the plane, imprinting
all those (I doubt api_imprint will work well, though, as this will be just
like imprinting a bunch
of wires), maybe with direct calls to curve-curve intersectors.  Just split
all the edges where they
cross/come in close contact.  You want to know all the edges that touch, and
from each touching, know
all the edges that emit from it.  (Pointing back from VERTEX to all the
incident EDGEs might be better
done with an attribute, but VERTEX just might have a sufficiently rich
backpointing capability.  The usual
functionality in backpointing from VERTEX to EDGE only allows one
backpointer.)  Once the imprint graph is
done, it's rather like writing a convex huller.  Find the vertex of absolute
minimum 2D (really, decide on
an X direction in your 2D projection), then walk the edges, each time taking
the maximum right turn, and
if you're lucky you get all the way back to the starting point.  Any edge or
vertex not encountered in the
walk is to be deleted.  You should get the face you're after.

Arlo Ames
[e-mail]

-----Original Message-----
From: shen [mailto:[e-mail]]
Sent: Wednesday, May 07, 2003 4:18 PM
To: ACIS ALLIANCE
Subject: [Acis-alliance] projection problem


Hello everybody,
I have been combating a small problem for a while and have reached
nowhere, and
would appreciate help.
Essentially I have been trying to get the projected area of a body along
a certain
direction.  If anyone knows how please let me know.
Essentially if I am looking at  body from a certain direction, what is
the area of the
shadow cast by the body (parallel projection) or the area of the
bounding box of the
shadow, whichever is easier.
I have tried a number of approaches, but cannot seem to get the answer
Thank you so much.

--
================================================
Zhengshu Shen
================================================
Design Automation Lab
Mechanical & Aerospace Engineering
Mail code 6106, Arizona State University - Main
Tempe AZ 85287-6106
Phone: [phone](office)
   Fax: [phone]
Email: [e-mail]
===============================================
http://asudesign.eas.asu.edu/index.html


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

From alames at sandia.gov  Thu May  8 12:25:56 2003
From: alames at sandia.gov (Ames, Arlo)
Date: Thu May  8 13:26:18 2003
Subject: [Acis-alliance] Grouping FACEs
Message-ID: <[e-mail]>

Shell has a member function, set_face, which tells the shell which face is
first.  Each face has a next pointer, which is the next FACE in the group of
faces.
You simply arrange that the FACEs in question form a list through their next
pointer, and tell the SHELL about the first one.
 
If your problem involves grouping ADJACENT faces into a shell, you make a
list of all possible faces.  Start from one, and write a classic brushfire
algorithm to find all the adjacent faces via the face's loops' coedges'
edge's coedge's loop's face.  Take the FACEs thus found, put them in a shell
as per prior paragraph (insure that their SHELL pointers refer back to the
shell), and continue through all the faces, starting a new brushfire each
time you find a face that doesn't belong to a shell.
 
If you're looking for something more sophisticated, I need more information
about your problem.

-----Original Message-----
From: Aparajit Pratap [mailto:[e-mail]]
Sent: Thursday, May 08, 2003 10:58 AM
To: [e-mail]
Subject: [Acis-alliance] Grouping FACEs



Hi, 

 

Is there anyway to group a number of FACEs on a BODY together and combine
them to form a new SHELL? Any help will be greatly appreciated.

 

Sincerely, 

 

Aparajit

 

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From lzguo2001 at cmmail.com  Sat May 10 21:04:25 2003
From: lzguo2001 at cmmail.com (lzguo)
Date: Sat May 10 08:08:22 2003
Subject: [Acis-alliance] How to save ACIS file in ACIS 8.0
Message-ID: <000c01c316ec$4d4b2890$af501e0a@t6>

Dear acis-alliance members,

  I have forgot how to save sat file. My ACIS version is ACIS 8.0SP5.My program can not save sat file now. Who can help me?
-----------------------------------------This is my program
#include <stdio.h>
#include "kernel/acis.hxx"  
#include "kernel/kernapi/api/api.hxx"  
#include "constrct/kernapi/api/cstrapi.hxx"
#include "kernel/kernapi/api/kernapi.hxx"
#include "kernel/kerndata/top/alltop.hxx"
#include "kernel/kerndata/lists/lists.hxx"
#include "kernel/kerndata/savres/fileinfo.hxx"

logical process(outcome result)
{

  if (!result.ok())  
  {
 print_warnerr_mess("API", result.error_number(), stdout); 
    return FALSE;
  } 
  return TRUE;
}

void save_ent(char *, ENTITY*);

void main()
{
 outcome rc = api_start_modeller(0);
 rc = api_initialize_constructors();
 BODY *cone;
 rc = api_make_frustum(50,20,30,10,cone);
 process(rc);
 save_ent("save_entity.sat",cone);
 ENTITY_LIST list;
 list.add(cone);
 list.init();
 for(int c=0;c>=0;c++)
 {
  ENTITY * an_entity=list.next();
  if(an_entity!=NULL)
  {
   an_entity->copy_scan(list);
  }
  else
   break;
 }
 int number_of_entities=list.count();
 printf("List Length =%d\n",number_of_entities);
 for(c=0;c<number_of_entities;c++)
  printf("ENTITY Number %d is a %s \n",c,list[c]->type_name());
 
// BODY *pris =NULL;
// rc=api_make_prism(100,150,200,7,pris);
// process(rc);
// save_ent("save_entity1.sat",pris);
 rc=api_terminate_constructors();
 rc=api_stop_modeller();
}

void save_ent(char *filename,ENTITY *ent)
{
 logical worked=FALSE;
 FileInfo info;
 info = *save_info;
 info.set_units( info.units());
 worked = process( api_set_file_info( FileUnits, info));

// FileInfo info;
// info.set_product_id("HW_University");
// info.set_units(1.0);
// outcome rc = api_set_file_info(FileId|FileUnits,info);
// process(rc);
 FILE *fp=fopen(filename,"w");
 if(fp!=NULL)
 {
  ENTITY_LIST *savelist=new ENTITY_LIST;
  savelist->add(ent);
  process(api_save_entity_list(fp,TRUE,*savelist));
  delete savelist;
  printf("Save Successful!\n");
 }
 else
  printf("Unable to open file!\n");

 fclose(fp);

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From leoung99 at hotmail.com  Tue May 13 14:12:35 2003
From: leoung99 at hotmail.com ([e-mail])
Date: Tue May 13 01:13:26 2003
Subject: [Acis-alliance] 
	Difficulty in using 3D InterOp Translator(ParaSolid Translator)
Message-ID: <[e-mail]>

Hi Sir,

  Recently I learned 3D InterOp Translator,and met some pbs.I tried to find the reason,but not.
As you know,the encapsulation of codes has hiden some important key technology,which,in some way,reduces the chance that I can find the answer to my questions.Why do I say this to you,just wish your help.Here is my questions.

1)outcome api_xparasolid_read( ENTITY_LIST& list, const char* psFileName, const char* logFileName=NULL, logical healFlag = TRUE)
I used this function to read a ParaSolid file(CS_CONROD.X_T).This error appears,"CS_CONROD.X_T  ERROR in api_xparasolid_read".

2)outcome api_xparasolid_write( ENTITY_LIST& list, const char* outFileName, const char* logFileName = NULL)
I used this function to create a ParaSolid file(ps1023.x_t) from a Acis file(ps1023.sat).The run is well,but the parasolid file created is empty.

Now I really need your help.

Thank you
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From leoung99 at hotmail.com  Tue May 13 14:12:46 2003
From: leoung99 at hotmail.com ([e-mail])
Date: Tue May 13 01:13:57 2003
Subject: [Acis-alliance] 
	Difficulty in using 3D InterOp Translator(ParaSolid Translator)
Message-ID: <[e-mail]>

Hi Sir,

  Recently I learned 3D InterOp Translator,and met some pbs.I tried to find the reason,but not.
As you know,the encapsulation of codes has hiden some important key technology,which,in some way,reduces the chance that I can find the answer to my questions.Why do I say this to you,just wish your help.Here is my questions.

1)outcome api_xparasolid_read( ENTITY_LIST& list, const char* psFileName, const char* logFileName=NULL, logical healFlag = TRUE)
I used this function to read a ParaSolid file(CS_CONROD.X_T).This error appears,"CS_CONROD.X_T  ERROR in api_xparasolid_read".

2)outcome api_xparasolid_write( ENTITY_LIST& list, const char* outFileName, const char* logFileName = NULL)
I used this function to create a ParaSolid file(ps1023.x_t) from a Acis file(ps1023.sat).The run is well,but the parasolid file created is empty.

Now I really need your help.

Thank you
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From kys at rnd.zuken.co.kr  Mon May 19 12:04:17 2003
From: kys at rnd.zuken.co.kr (Kim Yeongsoo)
Date: Mon May 19 15:08:35 2003
Subject: [Acis-alliance] question about unite operation
Message-ID: <010101c31daa$f4be1690$[e-mail]>

Hello,
I am trying to unite a series of bodies and get 2D outline data.
But when unite some bodies, it comes out acis error message as following 
"inconsistent containment of intersection curve" or 
"conincident face_face_ints with different body edges"... etc
Does anybody know why these messages come out?
and How can I avoid this error?
Thanks for your help in advance,
Kim.

******************************************************
 ZUKEN KOREA INC.
 3F,Dongnam Petrochemical B/D 1001-10, Daechi-dong,
 Kangnam-ku,Seoul,135-280,KOREA
  
 Name:Kim Yeongsoo     mailto:[e-mail]    
 TEL :[phone]        
******************************************************

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From pgao at cad.zju.edu.cn  Tue May 20 15:16:27 2003
From: pgao at cad.zju.edu.cn (Gao,Peng)
Date: Tue May 20 02:15:39 2003
Subject: [Acis-alliance] Functions about hiding entity
Message-ID: <[e-mail]>

Dear, all

   I am a new user of ACIS. Our group is developing a software for product modeling. In the software, I want to hide a enitity, then display it through menu. I find two fucntions in help, i.e. api_gi_erase_entity() and api_gi_display_entity(). When I invoke  api_gi_erase_entity(), the entity is hided. But when i invoke api_gi_display_entity(), it doesn't work and the entity is still hidden!  Can anybody tell me the right steps of doing it?

   Any idea will be greatly appreciated!
   

 				
　　　　　　　　　　　　　　Gao,Peng
　　　　　　　　　　　　　　[e-mail]
　　　　　　　　　　　　　　　　　2003-05-20