2004-march.txt

acis说明文档

Yes, that limitation has been removed. The curve can be a real 3d curve,
the curve can even "go around" the axis. But if the curve intersects the
axis, api_sweep_with_options does not return a result anymore.
Another "interesting" limitation: If the curve is a planar curve or
assume the points of a space curve are nearly in a plane and the axis of
revolution is nearly orhogonal to that plane - no result is returned by
the sweep option. I could understand it if plane and axis were really
normal to each other but api_sweep_... stops working as soon as they get
close to normal.

> I suspect the example you seek is to be found in the documentation on
> api_sweep_with_options.  I'm unsure, as I generally do my own
construction,
> having gotten tired early on with the limitations of the sweeping
> algorithms, and being a control freak about model topology...

That sounds to be very wise :)

Hannes


> 
> Arlo
> 
> -----Original Message-----
> From: Hannes Kaufmann [mailto:[e-mail]]
> Sent: Monday, March 01, 2004 5:53 AM
> To: [e-mail]
> Cc: [e-mail]
> Subject: Re: [Acis-alliance] create complex BODY
> 
> 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
> _______________________________________________
> 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

From nil.wehr at softwehr.net  Tue Mar  2 01:50:24 2004
From: nil.wehr at softwehr.net ([e-mail])
Date: Mon Mar  1 23:35:11 2004
Subject: [Acis-alliance] create complex BODY\
In-Reply-To: <[e-mail]>
References: <5694195$[e-mail]>
	<[e-mail]>
Message-ID: <[e-mail]>

Hello,

thank zou for the information.

I recognisze that the main problem I have is:

I use the example of the ACIS documentation (api_sweep_with_options) and the previous defined BODY* - Pointer keeps empty :-(


I create edges from SPAposition entities, create coedges from it, connect the coedges by setting next and prev.
This coedges I use to build a loop, which is used to create a FACE.
This FACE I want to use as the profile for the sweep-function - it doesnt't work (till now).

maybe anybody can show or tell my mistake

here's a part of the algorithm:

void GEOLever::createGeometry()
{	/*   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);


	// create coedges from edges
    COEDGE* myCoEdge1 = ACIS_NEW COEDGE;
    myCoEdge1->set_edge(line1);
    COEDGE* myCoEdge2 = ACIS_NEW COEDGE;
    myCoEdge2->set_edge(bogen1);
    COEDGE* myCoEdge3 = ACIS_NEW COEDGE;
    myCoEdge2->set_edge(line2);
    COEDGE* myCoEdge4 = ACIS_NEW COEDGE;
    myCoEdge2->set_edge(bogen2);

	// buily chain of coedges by setting next and previous
    myCoEdge1->set_next_no_rev(myCoEdge2);
    myCoEdge2->set_next_no_rev(myCoEdge3);
    myCoEdge3->set_next_no_rev(myCoEdge4);
	myCoEdge4->set_next_no_rev(myCoEdge1);

    myCoEdge1->set_previous_no_rev(myCoEdge4);
    myCoEdge2->set_previous_no_rev(myCoEdge1);
    myCoEdge3->set_previous_no_rev(myCoEdge2);
	myCoEdge4->set_previous_no_rev(myCoEdge3);


	LOOP* lowerLoop = ACIS_NEW LOOP();
	lowerLoop->set_start(myCoEdge1);

	FACE* lowerFace = ACIS_NEW FACE();
	lowerFace->set_loop(lowerLoop);

   
    m_pAcisShape = NULL;


    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(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
From nfarnsworth at web.de  Tue Mar  2 14:28:43 2004
From: nfarnsworth at web.de ([e-mail])
Date: Tue Mar  2 08:30:30 2004
Subject: [Acis-alliance] set an ACIS- TRANSFORM with Matrix Information
Message-ID: <[e-mail]>

An HTML attachment was scrubbed...
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From nfarnsworth at web.de  Tue Mar  2 15:06:39 2004
From: nfarnsworth at web.de ([e-mail])
Date: Tue Mar  2 09:06:51 2004
Subject: [Acis-alliance] set an ACIS- TRANSFORM with Matrix Information
Message-ID: <[e-mail]>

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 alames at sandia.gov  Tue Mar  2 08:27:41 2004
From: alames at sandia.gov (Ames, Arlo)
Date: Tue Mar  2 10:28:14 2004
Subject: [Acis-alliance] create complex BODY\
Message-ID: <[e-mail]>

Try calling api_check on various ENTITYs as you create them.  It's your best
bet to figure out what's going on, and is my first choice as far as general
tools for getting something working.

-----Original Message-----
From: [e-mail] [mailto:[e-mail]]
Sent: Monday, March 01, 2004 5:50 PM
To: [e-mail]
Subject: Re: [Acis-alliance] create complex BODY\


Hello,

thank zou for the information.

I recognisze that the main problem I have is:

I use the example of the ACIS documentation (api_sweep_with_options) and the
previous defined BODY* - Pointer keeps empty :-(


I create edges from SPAposition entities, create coedges from it, connect
the coedges by setting next and prev.
This coedges I use to build a loop, which is used to create a FACE.
This FACE I want to use as the profile for the sweep-function - it doesnt't
work (till now).

maybe anybody can show or tell my mistake

here's a part of the algorithm:

void GEOLever::createGeometry()
{	/*   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);


	// create coedges from edges
    COEDGE* myCoEdge1 = ACIS_NEW COEDGE;
    myCoEdge1->set_edge(line1);
    COEDGE* myCoEdge2 = ACIS_NEW COEDGE;
    myCoEdge2->set_edge(bogen1);
    COEDGE* myCoEdge3 = ACIS_NEW COEDGE;
    myCoEdge2->set_edge(line2);
    COEDGE* myCoEdge4 = ACIS_NEW COEDGE;
    myCoEdge2->set_edge(bogen2);

	// buily chain of coedges by setting next and previous
    myCoEdge1->set_next_no_rev(myCoEdge2);
    myCoEdge2->set_next_no_rev(myCoEdge3);
    myCoEdge3->set_next_no_rev(myCoEdge4);
	myCoEdge4->set_next_no_rev(myCoEdge1);

    myCoEdge1->set_previous_no_rev(myCoEdge4);
    myCoEdge2->set_previous_no_rev(myCoEdge1);
    myCoEdge3->set_previous_no_rev(myCoEdge2);
	myCoEdge4->set_previous_no_rev(myCoEdge3);


	LOOP* lowerLoop = ACIS_NEW LOOP();
	lowerLoop->set_start(myCoEdge1);

	FACE* lowerFace = ACIS_NEW FACE();
	lowerFace->set_loop(lowerLoop);

   
    m_pAcisShape = NULL;


    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);