If you study the mathematical problem of intersection between 2 planes, you could actually find all the parametric equations of the intersection lines between your plane and each face, and possibly project them into a flat graphic if needed.
You would have to sweep all the faces and compare them to your plane. Even though, faces are not infinite in extent as planes are... so here you would have a bit of a problem... quite a problem in fact! So that would be left to your research and creativity. Anyway, just thoughts that come out as I read. Hope it helps... On Fri, Jun 26, 2009 at 6:21 PM, joar <[email protected]> wrote: > > Thanks Li, > I also thought about the method you suggested, but before going that > path I wanted to know if there are any other option. > > Fabrice, I have an object mesh and I want to cut it with an arbitrary > plane (typically an xy-plane at different z-position determined by an > slider). I want to build (and display) the 2D polygon of that cut. > See the following skematic: > http://www.softeng.cse.clrc.ac.uk/everest/docs/post-processor/post_html/img10.gif > > joar > > On Jun 26, 12:11 am, Fabrice3D <[email protected]> wrote: > > what is it you want to do exactly? > > > > is it the mountain that must be separated from sea level? > > the mesh cut in half? > > ? > > > > Fabrice > > > > On Jun 25, 2009, at 11:55 PM, Li wrote: > > > > > Sounds like a difficult task to me... > > > > > All I can think of is using a camera, placing it at a strategic > > > point and setting up materials on the geometries so that if you > > > render it and process it you could get an image of what your > > > polygons might look like. All this with a precise renderer. > > > > > Thats just a cheat though, if you want precision, I'm afraid this > > > would involve some complex mathematics. Plus, I'm not sure if any > > > part of the engine handles anything like this. > > > > > Hope it helps! > > > > > On Thu, Jun 25, 2009 at 6:18 PM, joar <[email protected]> wrote: > > > > > Is there any way to compute the intersection between a Mesh object and > > > a 3D plane? > > > I have some meshes that I want to intersect with 3D planes at > > > arbitrary positions and draw the resulting 2D polygon on that plane. > > > thanks, > > > joar >
