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edge representations explained

chris goulielmos's picture
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I can't really capture how edge representation 2 works on brep format. I have an edge representation of type 2 defined by a line p(0, 0.8) d(1, 0) and refers to a surface of type cylinder p(0, 0, 0) N(0, 0, 1) dx(1, 0, 0), dy(0, 1, 0) r(0.8). How does that edge defines a boundary on the cylinder?

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Pawel's picture

Hello Chris,

every 3d surface has a corresponding 2d (uv or parametric) representation. In order to represent the cylindrical surface in two dimensions imagine you cut it through, unroll and put on a plane. The edge that was created as a result of cutting is your line.

To understand more about geometry an topology in OCCT, have a look here:

http://opencascade.blogspot.de/2009/02/topology-and-geometry-in-open-cascade.html

You can also use Total Engineer to see the topological structure of your shapes:

http://www.tes-cax.de/index-en/download.html

Hope this helps
Pawel

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