Hi,
I want to visually model the shelf design I added, but when I use sweep2, the area I marked (the blue line in my model) is not planar, I just get a sweep with a distorted surface on the z-axis. I don’t know how to deal with this, I would appreciate if you could help me.
References
My Results
Sweep_Problem.3dm (1.1 MB)
I’m using LOFT with good success. I’m having to manually align the seam(s) or it gets all twisted, so it takes a minute.
To get closer to the example you may have to add more curves to the lofts slightly past the straight parts, or else it wants to continue the curvature:
I’d have to copy another curve similar to what I’ve done here.
Sweep_Problem - KF.3dm (1.7 MB)
Hi, Unfortunately, I don’t have a Rhino 8. If it’s okay with you, I’d love to receive it as a Rhino 7 file.
I’d also love to know if you think it would be better to do it with SubD.
I’m personally not very good at SubD so don’t use it. As I get older I realize I can only memorize a finite amount of skills and techniques. 100% it’s worth a try because the Loft method isn’t simply a few clicks, you have to align all the seams which is really tedious:
Well not that tedious. But it makes me think there’re better ways.
A bit more playing around and I realize that more time invested = better looking result. But… since the object is broken up it helps hide imperfections somewhat. I tried a few approaches. In brief I found that breaking up the surfaces (along with investing time) gives a better result. Sweep (1 & 2) works better when you do it piece by piece.
Edit: Sorry I didn’t explain things well but ran out of time. If you have any further questions I can answer them later 
Sweep_Problem - KF - R7.3dm (2.5 MB)
You’ve been such a huge help! Thank you so much for all the extra info and advice. I’m not at my computer right now, so I can’t look at the model, but as soon as I can, I’ll check it out and mark your message as the solution. Thanks again!
It’s exactly what I want, but I’m just curious about what the difference is between 1 and 2. I did notice that only at Model 2 there were lines (that I selected) between the arc end and end start points. I’d love to know what those lines provide! Are those the lines of manual seam alignments?
I’ve also realized now that I can’t join the surfaces in the 2nd model in a way I can’t understand. What do you think the reason could be, and how can I solve it? I also tried aligning and joining at x with the setpt command, but it didn’t work. I’d be really grateful for any advice you could give me!
I used those lines as reference for sweep shapes. I’m just using them to find arbitrary points on each curve. I left them there so you could see the process a bit. The reason for the vertical/horizontal lines is that they are just base curves for using the BlendCrv command. That last example is done using multiple sweeps. Sometimes it’s better to split the task up instead of trying to hit it out of the park in one go.
The amount of isolines isn’t good. But if the model is complete (or very close to complete) you can get away with it. The model with fewer isolines (on the far left) is “better” but the shape isn’t quite as good.
Depending on what you’re trying to achieve - that is if the end result isn’t a smooth sweep but rather an array of planar pieces, the sweep/loft itself is just going to end up being a base surface to derive your final shapes from.
I got it. I’ll definitely keep that in mind for next time. Thank you for all your efforts.
