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Offsetting 3D Geometry. You can create an associative offset with a 3D element. Open the Offsetpad.CATPart document. Click Offset from the Operations toolbar (Transformation subtoolbar). Select the 3D surface to offset, Face.1 for example. The profile to be created is previewed. You can do one of the following: BTW, at this point, since the original 'Precise Outline' curves are not associative you might as well turn OFF 'Associative' when performing the 'Project' option so that you can get rid of all of the extra curves without messing-up anything. So now you have only the 2D profile of you model and nothing else. Sep 12, 2017 · Project our 3D model in the image (pixel space) and draw it. Figure 2: Overview of the whole process that brings to life our augmented reality application. The main tools we will use are Python and OpenCV because they are both open source, easy to set up and use and it is fast to build prototypes with them.