2003-december.txt

acis说明文档

On Sat, 2003-12-06 at 00:50, Jason Kraftcheck wrote:
> Mads Paulin wrote:
> > Hi,
> > 
> > I would like to facet entities in an ENTITY_LIST.
> > 
> > I need a set of polygons, where each polygon contains a normal + three
> > vertices. I also need the surface normal at each vertex.
> > 
> > Does anyone know how to do this ?
> > 
> > P.S I am using ACIS R12. I have done this in earlier versions of ACIS
> > using facet_unfacetted_entity() and setting the proper VERTEX_TEMPLATE
> > with set_default_vertex_template.
> > 
> > Since the latter function is now obsolete, I need to use some
> > mesh_manger etc. It is at this point I am lost...
> > 
> 
> You might start by looking at the documentation for the 
> SIMPLE_INDEXED_MESH class, api_set_mesh_manager, and api_facet_entity
> 
> online/refman/generated/refman/SPAfct/class_simple_indexed_mesh.htm
> online/refman/generated/refman/SPAfct/function_api_facet_entity.htm
> online/refman/generated/refman/SPAfct/function_api_set_mesh_manager.htm
> 
> 
> _______________________________________________
> Acis-alliance mailing list
> [e-mail]
> http://lists.cs.columbia.edu/mailman/listinfo/acis-alliance

From zz_zxc123 at cims.sjtu.edu.cn  Sun Dec  7 17:36:24 2003
From: zz_zxc123 at cims.sjtu.edu.cn (zhang xuechang)
Date: Sun Dec  7 04:34:43 2003
Subject: [Acis-alliance] 
	how to get the mathematic representation of a free-form face.
References: <[e-mail]>
Message-ID: <002201c3bca5$945a7dd0$c37afea9@zxc>

Hello everyone!
    My question is :
   When my program have read a sat file(a part consisted  of free-form surface),I want to know the control point along u and v direction.How can I do it? In other word,I want to know the mathematic representation of a sculpture face.
  Any help is appreciated!

zhang xuechang
2003.12.7

From g_baylor at yahoo.com  Wed Dec 10 15:35:26 2003
From: g_baylor at yahoo.com (=?iso-8859-1?q?gordon=20baylor?=)
Date: Wed Dec 10 10:39:33 2003
Subject: [Acis-alliance] Changing shapes in Scheme
Message-ID: <[e-mail]>

Hello there,
I am just beginnning to use ACIS which I will be using
for my work in
shape optimisation. Does anybody know if there is a
way to update a shape from within Scheme. For example
if I define something simple like a spline- 

(define pos1 (position 0 0 0))
(define pos2 (position 10 10 0))
(define pos3 (position 70 30 0))

(define spline1 (edge:spline (list pos1 pos2 pos3)))

If I update pos1 using the following

(position:set! pos1 100 0 0)

Is there any way that I can reflect this change in the
spline. The only way I can see is that the spline is
first deleted and then redefined using the updated
positions-

(entity:delete spline1)

(define spline1 (edge:spline (list pos1 pos2 pos3)))

Although position has a set function this does not
seem to be the case for the spline. There doesn?t seem
to be a method for changing the splines control points
even from within the C++ spline class. Will I have to
add my own functions in C++ to do this or am I missing
something more obvious?

Thanks in advance

Gordon


________________________________________________________________________
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From Nilesh.Joshi at asu.edu  Sun Dec 14 16:55:29 2003
From: Nilesh.Joshi at asu.edu (Nilesh Joshi)
Date: Sun Dec 14 18:57:53 2003
Subject: [Acis-alliance] identifying unknown attributes
In-Reply-To: <[e-mail]>
Message-ID: <[e-mail]>

hi guys
i am looking at a SAT file
and my task is to find out what all attributes are attached to the face.
there is this specific attribute as pasted below

step_repitem-attrib_gssl_step-attrib $-1 -1 $-1 $-1 $37 @5 FACE1 #
face $47 -1 $-1 $48 $49 $36 $-1 $50 forward single #

i want to know what is the information stored in this attribute
and also how to retrieve this information using ACIS
i can sent the SAT file whoever wants to take a look at it.

With Regards
-Nilesh Joshi
Design Automation Laboratory
Arizona State University 
From gaozhan at hkusua.hku.hk  Mon Dec 15 16:26:53 2003
From: gaozhan at hkusua.hku.hk (gaozhan)
Date: Mon Dec 15 03:29:03 2003
Subject: [Acis-alliance] 
	On how to extract NURBS representation from EDGE or FACE
In-Reply-To: <[e-mail]>
Message-ID: <000201c3c2e5$331cf160$5e570893@minabunny>

Hi, all,

Following are C++ codes examples to extract NURBS representation from
EDGE entity, then knot vector is refined and finally a new EDGE entity
is created.
For the FACE entity, similar methods will work too. 
In order to access the NURBS information such as knot vector or control
points from EDGE object, we first need to create a bs3_curve from this
EDGE object. 

//**********************************************************************
*
	//you got a EDGE from a series of points	EDGE * crv;
	api_curve_spline(5, pts, NULL, NULL, crv ,TRUE ,TRUE);
	
	//init spline interface
	api_initialize_spline( );
	bs3_curve_init( );

	//to get a bs3_curve
	CURVE * GeoCurve = crv->geometry();
	curve const & EqtCurve = GeoCurve->equation();

	SPAinterval uInterval;
	uInterval = EqtCurve.param_range();

	bs3_curve bs3crv = bs3_curve_make_cur(EqtCurve,
uInterval.start_pt() , uInterval.end_pt());

	//from a bs3_curve, you can get knot vector
	int num_knots; 
	double* knots;
	bs3_curve_knots(bs3crv, num_knots, knots);
	double * KnotVec = new double[num_knots];
	for(int i=0; i<num_knots; i++,knots++)
		TRACE1("%f, ", *knots);

	//or get control points
	int num_pts;
	SPAposition* ctrlpts;
	bs3_curve_control_points(bs3crv,num_pts,ctrlpts);

	//you can also insert a knot 
	int n = bs3_curve_add_knot( bs3crv, 0.5, 1, 0);

	//then you can make an EDGE entity from the bs3_curve
	intcurve *ic = ACIS_NEW intcurve(bs3crv, 0.0, *(surface *)0,
*(surface *)0);
	INTCURVE *IC = ACIS_NEW INTCURVE(*ic);

	SPAposition st, end;
	st = bs3_curve_start(bs3crv);
	end = bs3_curve_end(bs3crv);
	APOINT *aptSt = ACIS_NEW APOINT(st.x(), st.y(), st.z());
	APOINT *aptEnd = ACIS_NEW APOINT(end.x(), end.y(), end.z());
	VERTEX * start_vertex = ACIS_NEW VERTEX(aptSt);
	VERTEX * end_vertex = ACIS_NEW VERTEX(aptEnd);

	//finally you get that new edge, with shape as the same as the
//previous one, but knot vector refined. You can replace the
//previous one with this new one.
	EDGE * e = ACIS_NEW EDGE(start_vertex, end_vertex, IC, FORWARD);

	bs3_curve_term( );
	api_terminate_spline( );
//**********************************************************************
*

Good luck!

Jimmy


From san_munde at iitb.ac.in  Thu Dec 18 11:08:26 2003
From: san_munde at iitb.ac.in (MUNDE SANDEEP VIJAYKUMAR)
Date: Thu Dec 18 01:05:16 2003
Subject: [Acis-alliance] surface of revolution and Lofted surface
Message-ID: <[e-mail]>

hi,
 can somebody send me a program for generating surafce of revolution and
lofted surface i need it desperately. actually i am not getting how to
use acis, i am new to it.

thanking you
sandeep munde
M.Tech.
IIT Bomaby,
From san_munde at iitb.ac.in  Wed Dec 17 10:27:45 2003
From: san_munde at iitb.ac.in (MUNDE SANDEEP VIJAYKUMAR)
Date: Thu Dec 18 01:48:20 2003
Subject: [Acis-alliance] Surface of revolution and lofted surface
Message-ID: <[e-mail]>

hi all,

can anybody please give me a example ACIS program for surface of
revolution and lofted surface. i need it urgently. i have to work on it. i
am not getting ACIS bcoz i don't have any acis tutorial.

thanking you
From Nilesh.Joshi at asu.edu  Sat Dec 20 20:40:24 2003
From: Nilesh.Joshi at asu.edu (Nilesh Joshi)
Date: Sat Dec 20 22:42:33 2003
Subject: [Acis-alliance] AP 224
Message-ID: <[e-mail]>

hi guys
Please send me any STEP AP224 files you have.
I need a lot of sample files.

With Regards
-Nilesh Joshi
Design Automation Laboratory
Arizona State University 
From ywenbo at tom.com  Mon Dec 22 22:02:29 2003
From: ywenbo at tom.com (Yang Wenbo)
Date: Mon Dec 22 09:01:22 2003
Subject: [Acis-alliance] how to use law class to create face?
Message-ID: <001d01c3c894$47c195d0$501a75ca@walker>

Hello everyone,
    I'm using acisR10. I want to use law class to create face. Now, I can get the parametric equation of the face:
                       x=fx(u,v)
                       y=fy(u,v)
                       z=fz(u,v)
    the expressiones of x, y, and z are changed according to various conditions, and can be defined in specific condition.
so I have used the following functiones.
law* law_x;
law* law_y;
law* law_z;
law* law_xyz;
api_str_to_law(str_x,law_x);
api_str_to_law(str_y,law_y);
api_str_to_law(str_z,law_z);
……
api_face_law(law_xyz,minu,maxu,minv,minv,law_face);

Which function can combined 3 sublaws (law_x, law_y,law_z) into a single law(law_xyz) or vector that has 3 dimensions?
VEC? How to use?

Any help is appreciated.
Yang Wenbo
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From mkajtaz at vpac.org  Wed Dec 31 00:19:02 2003
From: mkajtaz at vpac.org (Mladenko Kajtaz (VPAC Summer))
Date: Tue Dec 30 08:23:33 2003
Subject: [Acis-alliance] Rendering in C++
Message-ID: <[e-mail]>

Hello there,
    I'm trying to render some entities in C++ but I'm having difficulties.
    I'm running ACIS R12 on Linux (RH 9) and I do have Motif installed. I'm =
    able to create windows but I do not know how to display geometry in the =
    windows.=20
    Could someone, please, explain how this is done? Some sample code would =
    be highly appreciated.
    Sincerely,
    Mladenko