Projection Precision Problem

[patmat2350]

I have imported an IGES surface of a ship's hull into F360. It comes from Delftship as an oodle of small surface patches. 

I can select them all and stitch them together into a single surface entity with no apparent flaws.

Now I need a flat curve representing the 3D deck edge. So I project the entire body into a sketch. As expected, most of the curve segments representing the edges are projected and they join end-to-end. But a number of them miss by enough for F360 to say they don't meet...even though they come from a contiguous surface. And I can't zoom in close enough to see the two separate end points, they're that close.

Seems like I'm forever running into issues with projections into sketches... sets of curves that should be closed and should create a profile in a sketch don't, and other odd issues.

Any thoughts besides "don't use projections"?

Surface is successfully stitched into a single crack-free body:

 

Project that body onto a sketch plane, and get a number of unjoined endpoints (all the open points):

 

[davebYYPCU]

Horses for courses.

Expecting Fusion to work nicely with exported data, - rabbit hole, how deep depends on the Export.

Not surprised Fusion can’t find a continuous curve, and look at all those spline points, yuk! Fusion will choke on that one alone.

If you can’t make the hull efficiently in Fusion, we can help with that, but not with imported data.

Might help....

[patmat2350]

Problem not solved but once again worked around:
Instead of projecting the body, I picked all the edge segments individually (tedious) and project those. It made a continuous curve this time.

[davebYYPCU]

Segmented - how many segments?

Let me know how you get on with that.  Fusion work best with minimums.

Might help.....