Spiral with half circle edges for skinning-you can do it

jeff hammond

(Jeff, you get a pass (A+) on this one since I'm not really sure if your model was exact apart from the slightly pointed arc ends. I will review, which I can't say why I haven't thoroughly except also for the fact that it seems it should be able to be done in one pass rather than 4.)

hey wait.. that was the exploratory version (i.e.- looking for the technique but not super concerned with accuracy)..
i think it could be done accurately (but it's hard to judge what accurate is in this case.. i mean i think it can be done in a way that's driven by geometry and less of an organic thing)

jeff hammond

the way it's being presented here could be solved this way (i used pilou's linked video for inspiration )

it's weird in that 'this spot' has everything rotating around the same z axis.. in contrast, that other version i tried had a little tear drop up there..

spiral2.skp

[edit].. oh wait.. i think i'm missing a 1/2 turn or two in there..
same thing just more of it then..

[i will say this though.. i don't think you're going to find an automated process for this.. i'm pretty sure someone would have to specifically make a nautilus plugin to get it done quickly]

brookefox

Many thanks, again. I think my problem with not accepting what is obvious to an experienced lofter is that I think the routine can see my intentions when in fact there are too many options to parse, so it must be done in pieces where the choices are more inevitable. As you have been saying. Thanks also for your patience.

SUFractal

@unknownuser said:

the way it's being presented here could be solved this way (i used pilou's linked video for inspiration )

it's weird in that 'this spot' has everything rotating around the same z axis.. in contrast, that other version i tried had a little tear drop up there..

[attachment=0:229g0of5]spiral2.skp[/attachment:229g0of5]

[attachment=1:229g0of5]spiral2.jpg[/attachment:229g0of5]

[edit].. oh wait.. i think i'm missing a 1/2 turn or two in there..
same thing just more of it then..

[i will say this though.. i don't think you're going to find an automated process for this.. i'm pretty sure someone would have to specifically make a nautilus plugin to get it done quickly]

awesome as a skater's park!

pilou

@unknownuser said:

awesome as a skater's park!

Normal, as Jeff is a skater's park builder & conceptor (?) in the reality!
So harmony of curves surfaces has no secret for him!

pilou

Remember that I had done in the past with 1001 (Revolution Surface Tool) I believe that it's inside the free version)

brookefox

Another great tip.

Merci, Frenchy, maestro nonpareil.

urgen

...some old video...no skining,but very exciting
http://www.youtube.com/watch?v=HuKEjp_2nlc&feature=plcp
http://www.youtube.com/watch?v=WojbqmZXSbg&feature=watch_response

brookefox

@unknownuser said:

Start from the red square, rotate the diagonal of the half red square = the golden rectangle
each corner gives you a new square by the black arcs circles
You can now draw the red Golden Spiral

Clear as mud, Pilou.

Nice that urgen's first video does the job for us so easily.

(As useful as it may be, I could not find a free version of 1001bit, only trials.)