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<P>Sophie,</P>
<P> to get the projection of a 3D object on a plane take a look at this OpenGL stuff on generating shadows (which sounds like what you want to do?)</P>
<P><A href="http://www.opengl.org/developers/code/mjktips/rts/index.html?shadows+rts#first_hit">http://www.opengl.org/developers/code/mjktips/rts/index.html?shadows+rts#first_hit</A></P>
<P>this looks interesting too</P>
<P><A href="http://www.flipcode.com/articles/article_objectoutline.shtml">http://www.flipcode.com/articles/article_objectoutline.shtml</A></P>
<P><BR>Given that vtk is built on top of OpenGL and if necessary you can mix OpenGL calls with vtk calls there may be something you can do here. In fact you might be able to do it all with vtk...</P>
<P> regards</P>
<P> Dave Pont</P></DIV>
<DIV></DIV>
<DIV></DIV>>From: "Lin Fei" <SOPHIE_LINFEI@HOTMAIL.COM>
<DIV></DIV>>To: vtkusers@public.kitware.com
<DIV></DIV>>Subject: [vtkusers] How to get the projection of a 3d object on a given plane?
<DIV></DIV>>Date: Fri, 10 May 2002 11:35:26 +0800
<DIV></DIV>>
<DIV></DIV>>Hi everybody,
<DIV></DIV>> I created an ISO surface using marching cubes.I want to project
<DIV></DIV>>it onto
<DIV></DIV>>a given plane and retrieve the 2D border of the projection.How to
<DIV></DIV>>get the
<DIV></DIV>>projection of a 3d object on a given plane?
<DIV></DIV>> By the way,how to get the intersection of the ISOSurface and a
<DIV></DIV>>given
<DIV></DIV>>plane?
<DIV></DIV>> Any help will be highly appreciated!
<DIV></DIV>>
<DIV></DIV>>Sophie
<DIV></DIV>>
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