As you can see here in the file I’ve uploaded a background bit map of a boat I’m designing in my free time.
19 Live Oak.3dm (1.8 MB)
I’ve having a hard time modeling the boat accurately in accordance with its lines plan. I’ve traced the stations and placed them in the appropriate locations and have modeled the chine flat well. I’ve found that network srf has led me away from my intended lines a bit…
For the work flow I intended to model the flat keel pad - then the chine flat area - then loft these two curves to render the area with the flattest deadrise from midships back to the transom. For the bow sections, I intend to use something like network SRF to connect the intended shape. I then intended to create a plane at the 12" design waterline that would trim away all lose ends and make a closed polysurface that could be used to calculate submerged volume. As you can see in the model for now its only showing 12" waterline to the keel (the area underwater). Having a hard time for now, advice would help a lot ! Thanks.
Use Picture rather than BackgroundBitmap to import the drawing. Then you will be able to scale and move the image. Picture | Rhino 3-D modeling
Skip using NetworkSrf. It has it’s uses but for surfaces like this use Sweep2. Model each surface separately.
Hydrostatics command will calculate the volume of a surface which is open on top, as long as there are no naked edges below the waterline. You can set the waterline height in the command options. The waterline height is the height above the world coordinate system origin. Hydrostatics | Rhino 3-D modeling
Thank you so much, I’ll run with your advice today and see how I do.
When doing a hard-chined hull, I always do the bottom (centerline - chine) in a single surface using loft or devloft in order to get the smoothest surface. Breaking the bottom panel can cause discontinuities and, as previously noted, NetworkSrf can introduce more problems than it solves.
If you are constrained by offsets, use them to get slopes along the bottom panel, and then extend whatever sections result in the surface out to a “false chine”. The important thing is to get the simplest surface possible.
Once the bottom has been lofted and the offsets verified, go to the top view and draw the inboard edge of the chine flat and the outboard edge of the keel flat and trim the bottom to these two curves, after which you can create two lofted surfaces with edgesrf or extrude and trim them to the intended actual edges.
I’ve done this, quickly, without checking any offsets, but it took about 10 minutes to create the three surfaces needed to accomplish the above.
The circles show areas where the two edges of the bottom panel needs attention.
19 Live Oak.3dm (1.8 MB)
Are you talking about the keel not being straight? —Mark
Thank you so much! I’ve made significant improvements to my model this week. I actually used the extrusion method to lock in my chine flats and chine heights. I really appreciate all the advice. If you want- you can take a look at where I’m at. Thanks!
19 Live Oak.3dm (4.3 MB)
1 Like
Hi Jack , I would think that you could simplify your surfaces a great deal. . Keep refining. I like that you are working on it .
Have you ever looked into Sky Greenwalt? He has a couple learning videos . I think it is thirtysix verts. —Mark
19 Live Oak (3).3dm (5.0 MB)
I messed with one of your side walls . I hope it helps in some way.—Mark
Schuyler G., thirtysixverts is great stuff. 10 or 12 videos.
Watch’em all, over and over, read all sugested materials.
