How to get silhouette of a part from a particular direction with opencascade

[sazuko]

I have used HLR do project visible edges, but the getting outer loop from those is not well documented, or perhaps my ability to do is limited, i do have few parts where a tons of edges are projected on a plane and intersecting at multiple sections. What would be the best way to do it.

 

[Quaoar]

In HLR, there is a bunch of methods to extract the projected edges. Here is the excerpt from Analysis Situs:


Nullifying those shapes you can play with the result of HLR, although I'm not sure it can return just the visible contour of the shape.