N J Cook

[N J Cook]

With doubled up surfaces you will also get excessive displacement … see #2172

[N J Cook]

I sometimes have the same problem. It seems to occur when intersecting the hull with another plane. In my case (see attached image file), adding a floor produces problems with the linesplan sections …. you can see that the second section is kinked upwards near the centreline and other sections have missing segments. If I uncheck “intesections” and “linesplan” for the floor the problem goes away.

Attachments:

• badsections.jpg

[N J Cook]

I’ve never been able to create an edge inside a hull. Edge | Insert always seems to be greyed out. Attempts to extrude always end up with “No boundary edge selected”. How is it done, then?

Extruding a deck or transom from the hull edges is no problem, but how do you extrude a deck some way below the hull rail to leave an upstand?

Intersecting the face of a box means you can create a plane bulkhead anywhere, not just on defined stations.

[N J Cook]

Hi Heemi

I had been puzzling on the easiest way to insert a bulkhead into a hull … and have come up with a simple proccedure that works. This assumes that you have defined a hull and a deck.

1. Use Tools | Add box … with the Add new layer boxed ticked, to insert a box in its own layer that is wider and longer than the hull, placing one face of the box on the station you want the bulkhead.
2. Delete corners of the faces that you do not want and they will disappear, leaving only a single face at the bulkhead position.
3. Use Tools | Subdivide control net until this face is subdivided into a fine enough mesh for the next steps.
4. Use Edit | Point | Intersect layers with the new bulkhead layer first and the hull layer second to insert the insersection points into the bulkhead layer.
5. If the deck is in a separate layer, do 4. again, but with bulkhead and deck.
6. Now the bulkhead face has new points around the intersection with the deck and hull.
7. Select and delete points on the bulkhead face that lie outside the hull and deck until you are left with a bulkhead that fits.
8. Now you can lighten the bulkhead with holes by deleting points in the middle.

I have used this method to put a bulkhead (transverse plane), a floor (horizontal plane) and side buoyancy compartments (longitudinal plane) into a dinghy-skiff design. It works for me … so should for you.

Nick

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