2003-march.txt

acis说明文档

partners and 3D-software industry advocates to interact with Spatial's
executives and developers. Government and university researchers are
encouraged to attend as well, since presentations and discussions will
traverse a wide variety of subjects and applications of Spatial's
technology. Topics will include, but not be limited to, ACIS, InterOp, and
CAA V5. Elaine Hinman-Sweeney and Arlo Ames of Sandia National Laboratories
will present a joint keynote speech.


In addition to presentations, attendees will have access to the Insiders'
Workshop, in which Spatial technical staff will be available to answer
one-on-one questions and conduct demonstrations. Plus, there will be plenty
of opportunities to interact and network with other attendees and Spatial
staff!


Registration is available now. Register early and save-?before April 30
registration is only $395! Company and group registrations are discounted,
and if more than one person registers from your company, the additional
registrants are only $150 each!


For further information about the event, or to register for this event, go
to our Web site at:
http://www.spatial.com/summit03


We hope to see you in June!










From tangency"<[e-mail]  Wed Mar 12 22:50:42 2003
From: tangency"<[e-mail] (tangency)
Date: Thu, 13 Mar 2003 04:20:42 +0530
Subject: [Acis-alliance] projected area
Message-ID: <[e-mail]>

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Hello everybody,


I am a new member to the group, and I hope that I can learn a lot and help a lot.


I am facing a certain problem and was wondering if anyone could give me a few pointers.


I am involved in finding the projected area of a solid in a certain direction.  I have been looking at many ways in which to do it, but all of them failed.


My only way which is looking reasonable is to use api_project_wire, but one of the problems I face is how to do create a surface from the bunch of wires projected and how to I get the area off this.


Anyhelp in this approach or any alternative approach will be deeply appreciated.


thank you so much people 


:)


 
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<P>Hello everybody,</P>
<P>I am a new member to the group, and I hope that I can learn a lot and help a lot.</P>
<P>I am facing a certain problem and was wondering if anyone could give me a few pointers.</P>
<P>I am involved in finding the projected area of a solid in a certain direction.&nbsp; I have been looking at many ways in which to do it, but all of them failed.</P>
<P>My only way which is looking reasonable is to use api_project_wire, but one of the problems I face is how to do create a surface from the bunch of wires projected and how to I get the area off this.</P>
<P>Anyhelp in this approach or any alternative approach will be deeply appreciated.</P>
<P>thank you so much people </P>
<P>:)</P>
<P>&nbsp;</P>
<hr><font face="Arial" size="2"><b>Get Your Private, Free E-mail from Indiatimes at  </font><a href="http://email.indiatimes.com"><font face="Arial" size="2">http://email.indiatimes.com</a></b><br>Buy the best in Movies at <A href="http://www.videos.indiatimes.com">http://www.videos.indiatimes.com</A><br>Bid for <b>Air Tickets @ Re.1</b> on Air Sahara Flights. Just log on to <a href="http://airsahara.indiatimes.com">http://airsahara.indiatimes.com</a> and Bid Now !</font>

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From [e-mail]  Thu Mar 13 22:12:50 2003
From: [e-mail] (Ames, Arlo)
Date: Thu, 13 Mar 2003 15:12:50 -0700
Subject: [Acis-alliance] projected area
Message-ID: <[e-mail]>

This message is in MIME format. Since your mail reader does not understand
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You're on a reasonable track.  Imprint all the wires against each other,
then walk the resultant graph.  You'll want to make sure you include
silhouette edges in the set of wires you project.  It is almost easier if
you do the projection yourself, as it's helpful to know whether the
projection of each edges is locally inside or outside of the model.  Where
the projection is locally not inside of the model, you have a candidate
boundary edge, while if the projection (forward or backward along the
projection direction) is locally inside, you don't really care about
projecting the edge.  Note that you're interested in regions of each edge,
as the curved nature of everything can leave you with an edge that changes
classification many times along its length.  If you have all the projections
of all the coedges that don't locally project to inside the solid, you have
a set of coedges that might be boundaries.  Find the exterior-most
concatenatable loop and you have the exterior of the shadow.  The interior
requires the same sort of logic, but is worse because even if a loop is
locally visible, it might be globally in shadow; you will likely require
some ray firing to disambiguate.
 
Alternatively, if an approximation will do, facet the model, render all the
facets in white on a black pixmap in GL, then count the nonblack pixels.
The approximation will be limited in accuracy to the accuracy of your
facetization and the resolution of your pixmap, but it will go fast;
possibly a lot faster than the first approach, depending on the complexity
of the model.
 
Arlo

-----Original Message-----
From: tangency [mailto:[e-mail]]
Sent: Wednesday, March 12, 2003 3:51 PM
To: [e-mail]
Subject: [Acis-alliance] projected area



Hello everybody,

I am a new member to the group, and I hope that I can learn a lot and help a
lot.

I am facing a certain problem and was wondering if anyone could give me a
few pointers.

I am involved in finding the projected area of a solid in a certain
direction.  I have been looking at many ways in which to do it, but all of
them failed.

My only way which is looking reasonable is to use api_project_wire, but one
of the problems I face is how to do create a surface from the bunch of wires
projected and how to I get the area off this.

Anyhelp in this approach or any alternative approach will be deeply
appreciated.

thank you so much people 

:)

 

  _____  

Get Your Private, Free E-mail from Indiatimes at
<http://email.indiatimes.com> http://email.indiatimes.com
Buy the best in Movies at http://www.videos.indiatimes.com
<http://www.videos.indiatimes.com> 
Bid for Air Tickets @ Re.1 on Air Sahara Flights. Just log on to
http://airsahara.indiatimes.com <http://airsahara.indiatimes.com>  and Bid
Now ! 


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">


<META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=664030422-13032003><FONT face=Arial color=#0000ff size=2>You're 
on a reasonable track.&nbsp; Imprint all the wires against each other, then walk 
the resultant graph.&nbsp; You'll want to make sure you include silhouette edges 
in the set of wires you project.&nbsp; It is almost easier if you do the 
projection yourself, as it's helpful to know whether the projection of each 
edges is locally inside or outside of the model.&nbsp; Where the projection is 
locally not inside of the model, you have a candidate boundary edge, while if 
the projection (forward or backward along the projection direction) is locally 
inside, you don't really care about projecting the edge.&nbsp; Note that you're 
interested in regions of each edge, as the curved nature of everything can leave 
you with an edge that changes classification many times along its length.&nbsp; 
If you have all the projections of all the coedges that don't locally project to 
inside the solid, you have a set of coedges that might be boundaries.&nbsp; Find 
the exterior-most concatenatable loop and you have the exterior of the 
shadow.&nbsp; The interior requires the same sort of logic, but is worse because 
even if a loop is locally visible, it might be globally in shadow; you will 
likely require some ray firing to disambiguate.</FONT></SPAN></DIV>
<DIV><SPAN class=664030422-13032003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=664030422-13032003><FONT face=Arial color=#0000ff 
size=2>Alternatively, if an approximation will do, facet the model, render all 
the facets in white on a black pixmap in GL, then count the nonblack 
pixels.&nbsp; The approximation will be limited in accuracy to the accuracy of 
your facetization and the resolution of your pixmap, but it will go fast; 
possibly a lot faster than the first approach, depending on the complexity of 
the model.</FONT></SPAN></DIV>
<DIV><SPAN class=664030422-13032003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=664030422-13032003><FONT face=Arial color=#0000ff 
size=2>Arlo</FONT></SPAN></DIV>
<BLOCKQUOTE>
  <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma 
  size=2>-----Original Message-----<BR><B>From:</B> tangency 
  [mailto:[e-mail]]<BR><B>Sent:</B> Wednesday, March 12, 2003 
  3:51 PM<BR><B>To:</B> [e-mail]<BR><B>Subject:</B> 
  [Acis-alliance] projected area<BR><BR></FONT></DIV>
  <P>Hello everybody,</P>
  <P>I am a new member to the group, and I hope that I can learn a lot and help 
  a lot.</P>
  <P>I am facing a certain problem and was wondering if anyone could give me a 
  few pointers.</P>
  <P>I am involved in finding the projected area of a solid in a certain 
  direction.&nbsp; I have been looking at many ways in which to do it, but all 
  of them failed.</P>
  <P>My only way which is looking reasonable is to use api_project_wire, but one 
  of the problems I face is how to do create a surface from the bunch of wires 
  projected and how to I get the area off this.</P>
  <P>Anyhelp in this approach or any alternative approach will be deeply 
  appreciated.</P>
  <P>thank you so much people </P>
  <P>:)</P>
  <P>&nbsp;</P>
  <HR>
  <FONT face=Arial size=2><B>Get Your Private, Free E-mail from Indiatimes at 
  </FONT><A href="http://email.indiatimes.com"><FONT face=Arial 
  size=2>http://email.indiatimes.com</A></B><BR>Buy the best in Movies at <A 
  href="http://www.videos.indiatimes.com">http://www.videos.indiatimes.com</A><BR>Bid 
  for <B>Air Tickets @ Re.1</B> on Air Sahara Flights. Just log on to <A 
  href="http://airsahara.indiatimes.com">http://airsahara.indiatimes.com</A> and 
  Bid Now !</FONT> </BLOCKQUOTE></BODY></HTML>

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From [e-mail]  Fri Mar 14 17:05:04 2003
From: [e-mail] (Hannes Kaufmann)
Date: Fri, 14 Mar 2003 18:05:04 +0100
Subject: [Acis-alliance] intersection curve
Message-ID: <[e-mail]>