2004-march.txt

acis说明文档

    outcome result =
api_sweep_with_options(lowerFace,path_dir,swOpt,m_pAcisShape);


ENTITY *sweep_result = NULL;
if(m_pAcisShape)
{
    sweep_result = m_pAcisShape;
}
else
{
    check_outcome( api_get_owner(lowerFace,sweep_result));
}
}


I think there must be a bug at the FAE creating algo. The lower part
(creating axis, options, path) is nearly the same like it is displayed by
the
documentation.



If anybody could show my bugs, I would be very happy :-)


thank you for your support


Juergen Wehr








On Mon, Mar 01, 2004 at 01:53:03PM +0100, Hannes Kaufmann wrote:
> As far as I have seen it is not possible with ACIS to sweep whole bodys
> around an axis. You can only sweep profile curves.
> The sweeping does not seem to be very sophisticated. I don't even get a
> valid result if I sweep a profile that intersects the axis around an
> axis.
> 
> Hannes
> 
> 
> [e-mail] wrote:
> > 
> > Hello,
> > 
> > I want to create complex bodies by using
> > vetices->SPApostion->edge->coedge->wire -> ... sweep straight along axis
> > -> BODY
> > 
> > I can create the wire by setting the first coedge (which points to the
> > following coedge ...).
> > 
> > But how do I use the sweep-algorithm to create BODY-objects?
> > 
> > If anybody could send an example (even simple geometry like box, made by
> > sweep) I would be(very) happy.
> > 
> > Also a link to an example would support myself.
> > 
> > Thank you for your support
> > 
> > Jeurgen Wehr
> > _______________________________________________
> > Acis-alliance mailing list
> > [e-mail]
> > http://lists.cs.columbia.edu/mailman/listinfo/acis-alliance
> 
> -- 
>     Hannes Kaufmann | Vienna University of Technology
>          Researcher | Interactive Media Systems Group
> T [phone] | F [phone]
>            kaufmann @ ims.tuwien.ac.at
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From alames at sandia.gov  Tue Mar  2 10:28:12 2004
From: alames at sandia.gov (Ames, Arlo)
Date: Tue Mar  2 12:29:07 2004
Subject: [Acis-alliance] set an ACIS- TRANSFORM with Matrix
 Informatio n
Message-ID: <[e-mail]>

I have used the undocumented function restore_transf for this in the past.
It lets you set everything in one call, but isn't in the standard set of
functions.

The SPAtransf member function compose might suit your needs.

A matrix concatenation of scale_transf, coordinate_transf and
translate_transf does the trick.  The coordinate_transf function takes as
its arguments the vectors that make up an affine transformation.  The
scaling and translations are obvious.

Note that ACIS takes great pains to store matrices with scaling separate
from the affine part, separate from the translation part.  In matrices where
you don't perform arbitrary actions, transformation is much faster if you
maintain your affects separate.

Arlo Ames
[e-mail]

-----Original Message-----
From: [e-mail] [mailto:[e-mail]]
Sent: Tuesday, March 02, 2004 7:07 AM
To: [e-mail]
Subject: [Acis-alliance] set an ACIS- TRANSFORM with Matrix Information


Hello,
I want to set an ACIS-TRANSFORM- Object with values. I have to set each
value of the matrix which belongs to the TRANSFORM Object. For example I
mine TRANSFORM::setMatrix(SPAmatrix mat) or TRANSFORM::setValues(double
a11,..,double a44). 
To serve my purpose I can not use the api functions rotate_transf and
translate_transf and combine this tranforms.
Is there a posibility to do this?
Thanks for your support.

Niklas

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From nil.wehr at softwehr-service.de  Wed Mar  3 12:20:03 2004
From: nil.wehr at softwehr-service.de ([e-mail])
Date: Wed Mar  3 06:23:15 2004
Subject: [Acis-alliance] sweeping problems
Message-ID: <5694195$[e-mail]>


Hello,


I try to sweep a face along an axis (vertex).

The spatial support told me to build the face by
"api_cover_planar_edges" and sweep this profile.

I tried, and got errors (no BODY was build)

could anybody show what I'm doing wrong, please?




	/*   lever vertices position (z always -m_dDepth/2) for basic face

			1-------------2
		   /               \
		  6                 3
		   \               /
			5-------------4
	*/

	// set vertices
	SPAposition v_StartPtLine1(-m_dLength/2, m_dWidth/2, -m_dDepth/2);
	SPAposition v_StartPtArc1(m_dLength/2, m_dWidth/2, -m_dDepth/2);
	SPAposition v_MiddlePtArc1((m_dLength/2)+(m_dWidth/2), 0.0,
-m_dDepth/2);
	SPAposition v_StartPtLine2(m_dLength/2, -m_dWidth/2, -m_dDepth/2);
	SPAposition v_StartPtArc2(-m_dLength/2, -m_dWidth/2, -m_dDepth/2);
	SPAposition v_MiddlePtArc2(-(m_dLength/2)-(m_dWidth/2), 0.0,
-m_dDepth/2);

	// create edges from vertices
    EDGE* line1;
    EDGE* line2;
    EDGE* bogen1;
    EDGE* bogen2;
    outcome oc_line1 = api_curve_line(v_StartPtLine1, v_StartPtArc1,
line1);
    outcome oc_line2 = api_curve_line(v_StartPtLine2, v_StartPtArc2,
line2);
    outcome oc_bogen1 =  api_curve_arc_3pt(v_StartPtArc1,
v_MiddlePtArc1, v_StartPtLine2, FALSE,	bogen1);
    outcome oc_bogen2 =  api_curve_arc_3pt(v_StartPtArc2,
v_MiddlePtArc2, v_StartPtLine1, FALSE,	bogen2);

	ENTITY_LIST myEntList;
	myEntList.clear() ;
	myEntList.add(line1);
	myEntList.add(bogen1);
	myEntList.add(line2);
	myEntList.add(bogen2);

    m_pAcisShape = NULL;
	ENTITY_LIST wires;
	outcome oc_tmpbody = api_cover_planar_edges(myEntList, m_pAcisShape,
wires);

    
	if(is_BODY(m_pAcisShape))
    {
        LUMP *pl = ((BODY*)m_pAcisShape)->lump();
        if(pl)
        {
            do
            {
                SHELL *ps =  ((LUMP*)pl)->shell();
                do
                {
                    FACE* pface = ((SHELL*)ps)->face_list();
                    do
                    {
						if(pface)
						{
							sweep_options* swOpt = ACIS_NEW sweep_options();
							//    swOpt->set_close_to_axis(TRUE);

							m_pAcisShape = NULL;
							SPAvector path_dir(0.0,1.0,0.0);

						    outcome result =
api_sweep_with_options(pface,path_dir,swOpt,m_pAcisShape);


							ENTITY *sweep_result = NULL;
							if(m_pAcisShape)
							{
								sweep_result = m_pAcisShape;
							}
							else
							{
								check_outcome( api_get_owner(pface,sweep_result));
							}

}
                        pface = pface->next_in_list();

					}while (pface);
                    ps = ps->next();

				} while(ps);
                pl = pl->next();
			}while (pl);
		}
	}



thank you very much for your help,



Juergen
From alames at sandia.gov  Wed Mar  3 10:30:49 2004
From: alames at sandia.gov (Ames, Arlo)
Date: Wed Mar  3 12:32:15 2004
Subject: [Acis-alliance] sweeping problems
Message-ID: <[e-mail]>

I don't have time to debug this.  If you want to make progress, you need to
know, at each step, whether you have been successful in constructing what
you think you've constructed.  For example, do an api_save_entity_list after
constructing the planar face.  Load the result into 3Dtoolkit, test harness,
or whatever.  Does it look like the planar face you created.  Then check the
result with api_check (the test harness command is check; I don't used
3Dtoolkit, so can't help you there).  If the entity checks, go to the next
thing you construct and repeat.

I don't generally program ACIS in the style you are using -- I rely far less
on the api functions than you are, so I can't spot what might be an obvious
bug.  You might, for instance, be creating an arc with wrong sense, ending
up with a cross-section that crosses itself.  If you don't address the
problem by LOOKING at the intermediate geometries, you can't debug it.  If
things look OK, api_check will do a wide variety of checks to make sure that
they seem OK.  You have to get used to reading the output from it -- if you
have a single face, non-two-sided, you'll get errors complaining of
unmatched coedges.  Since you expect it, that's OK.  If api_check tells you
that you have a self-intersecting loop, look into it.  That would be a bug.
If you can tell me what api_check is telling you, and have a question about
it, I might be able to help you interpret it.  But I don't have the time to
fix your code.

-----Original Message-----
From: [e-mail] [mailto:[e-mail]]
Sent: Wednesday, March 03, 2004 4:20 AM
To: [e-mail]
Subject: [Acis-alliance] sweeping problems



Hello,


I try to sweep a face along an axis (vertex).

The spatial support told me to build the face by
"api_cover_planar_edges" and sweep this profile.

I tried, and got errors (no BODY was build)

could anybody show what I'm doing wrong, please?




	/*   lever vertices position (z always -m_dDepth/2) for basic face

			1-------------2
		   /               \
		  6                 3
		   \               /
			5-------------4
	*/

	// set vertices
	SPAposition v_StartPtLine1(-m_dLength/2, m_dWidth/2, -m_dDepth/2);
	SPAposition v_StartPtArc1(m_dLength/2, m_dWidth/2, -m_dDepth/2);
	SPAposition v_MiddlePtArc1((m_dLength/2)+(m_dWidth/2), 0.0,
-m_dDepth/2);
	SPAposition v_StartPtLine2(m_dLength/2, -m_dWidth/2, -m_dDepth/2);
	SPAposition v_StartPtArc2(-m_dLength/2, -m_dWidth/2, -m_dDepth/2);
	SPAposition v_MiddlePtArc2(-(m_dLength/2)-(m_dWidth/2), 0.0,
-m_dDepth/2);

	// create edges from vertices
    EDGE* line1;
    EDGE* line2;
    EDGE* bogen1;
    EDGE* bogen2;
    outcome oc_line1 = api_curve_line(v_StartPtLine1, v_StartPtArc1,
line1);
    outcome oc_line2 = api_curve_line(v_StartPtLine2, v_StartPtArc2,
line2);
    outcome oc_bogen1 =  api_curve_arc_3pt(v_StartPtArc1,
v_MiddlePtArc1, v_StartPtLine2, FALSE,	bogen1);
    outcome oc_bogen2 =  api_curve_arc_3pt(v_StartPtArc2,
v_MiddlePtArc2, v_StartPtLine1, FALSE,	bogen2);

	ENTITY_LIST myEntList;
	myEntList.clear() ;
	myEntList.add(line1);
	myEntList.add(bogen1);
	myEntList.add(line2);
	myEntList.add(bogen2);

    m_pAcisShape = NULL;
	ENTITY_LIST wires;
	outcome oc_tmpbody = api_cover_planar_edges(myEntList, m_pAcisShape,
wires);

    
	if(is_BODY(m_pAcisShape))
    {
        LUMP *pl = ((BODY*)m_pAcisShape)->lump();
        if(pl)
        {
            do
            {
                SHELL *ps =  ((LUMP*)pl)->shell();
                do
                {
                    FACE* pface = ((SHELL*)ps)->face_list();
                    do
                    {
						if(pface)
						{
							sweep_options* swOpt
= ACIS_NEW sweep_options();
							//
swOpt->set_close_to_axis(TRUE);

							m_pAcisShape = NULL;
							SPAvector
path_dir(0.0,1.0,0.0);

						    outcome result =