Michael,

Thank you for explaining this issue. I have now imported several other cuts into Prosurf and this happens sometimes and sometimes not. If the residual trimming lines are joined or unioned before saving and exporting to Prosurf this doesn´t happen.

However for some reason the commands "join" or "union" do not always seem to work. For example the deck bridge on the catmaran below was constructed by a sequnece extruding, intersecting, deleting, mirroring and moving surfaces. There is a "scar" from this procedure left on the left side of the deck bridge. The scar on the right was easily removed using the "union" command, but not on the left side.

Is this some kind of a bug in the NURBS kernel library or me just being clumsy?

Hi boatstalker - can you please post your model file? I can't really tell what is wrong just looking at a screenshot.

For 2 pieces to join, they have to be connected at a pretty tight tolerance - if there is too much space or a gap between 2 pieces they won't join. That might be what you are running into, but if you post your model file I can examine it more closely to check.

Is the scar you are talking about the line running down the deck? That looks like a surface edge. Most of the time if you join or union edges like that will remain in the final result, mostly the only exception is on some handling of planar surfaces where sometimes a union can combine 2 planar surfaces into one larger plane and remove interior edges.

- Michael

Michael,

This is probably just a surface edge. Don´t worry. I justed needed an excuse to post a picture of my catamaran :-)

The "trimming bug" previously mensioned in this thread is definitely some kind of a "kink" Prosurf, not MoI.
Here are some pictures of what the .dxf mesh generated by Prosurf looks like and as a comparison we have the .dxf mesh
generated by Rhino.

It looks like your catamaran is coming along nicely!

Probably somewhere along the line you mirrored one surface and joined, creating 2 surfaces with an edge between them, then possibly that assembly got trimmed with the center line not arranged right in the center between the trimming objects.

It looks like that in-between piece is a straight connection (sometimes called a "ruled" surface).

So to tune this up what you can do is select both of those surfaces in between your hulls and delete them. Then select the 2 inside edges at the top of the hulls, and then do a Construct / Loft between them.

That will build a new single surface connecting those pieces - that will not have any interior edge anymore. Then you can join those hulls and the connecting surface together into one object.

Let me know if you need more detailed info on these steps - if you post your model or e-mail it to me, I can show you some step-by-steps images on your model if you want.

- Michael

Michael,

Thats a brilliant suggestion. No need to guide me further through the steps. It couldn´t be more simple. Thanks a lot. In return will invite you to go fishing with me when the boat is finished :-)

Best regards,

Boatstalker

Here is the scar removal procedure:


First, delete the central piece that has the unwanted middle edge in it, and then select these 2 edges:




Then use Construct / Loft to get this scar-free result:



A couple other notes - MoI doesn't seem to be doing too good of a job of making the display mesh for some of these pieces, some things look more jagged than they really are. That's something that I want to tune up more in the future but it might not get better until after V1.

EDIT: oops, didn't see your last post in time, well here you go anyway! :)

- Michael