extrusion along the z axis

[Cristallo]

in practice you have placed a profile at the beginning and end of each beads and at the beginning, end and center of each curve along the beads

not only the center of each curve, otherwise you get a shape with the edges along the connecting arc.
the more you put it, the more you get faithful to the original path.

and you got the solid through the loft command!

Did this thing surprise you?
in autocad the easiest things you do, the better they come.:biggrin:

 

[doking]

I'm sorry why you should have surprised me or irritated me? I had understood that it had to proceed for "sections" but the loft had not really considered it. not at all I know student none designer navigate :d

 

[Joseph]

But, guys, when you post, do you read the previous posts?
we arrived in two at the same, even if approximated, solution.
Now it's up to those who started the discussion to say if he's okay with it.

 

[doking]

But, guys, when you post, do you read the previous posts?
we arrived in two at the same, even if approximated, solution.
Now it's up to those who started the discussion to say if he's okay with it.

in fact you are right, but you want to put that crystal has explained everything in detail:biggrin:

 

[Cristallo]

but you want to put that crystal has explained everything in detail

Don't touch me josh! It puts me in the sack in 4 and 4 eight if it only applies a little.
It's just that I've been busy, otherwise you couldn't find joseph.
:smile:

 

[Joseph]

Don't worry, crystal: here there is no competition to who is the best or to whom comes first.

 

[doking]

I tried crystal has followed your method but I find it difficult.
I can't properly rotate the profiles along the curves

Let's put in plain sight and one by one, we roar the red sections by using the "wheel" command with "reference" option.
when acad asks the point of rotation we will take care to select the center (even if we have to force it manually).
It's true that we see a line on video, but autocad will take the center of the section arc as a point.
giving option "reference" acad will ask for the first point (again the nod of the arc) and second point (an end of the section, no matter which), then ask for the destination point and take the center of the circle we created.

when you say "second point (an end of the section, we don't care which)"
I select the point indicated in the 2nd photo but then not having a precise point the profile rotates around the circle, and also having the garden activated I can not have a very precise point. What am I wrong?
Of course I also turn to joseph

 

[Joseph]

Following the idea of crystal on the perpendicularity of the sections to the trajectory, I suggest another road.
1- transform the shape into a block with a base point on the first point of the trajectory;
2- Measure command: insert a congruous number of blocks with the alignment=yes option
3- Exploding all blocks: in this way all the silhouettes will still be in the form of polylinese
4-Loft command, selecting one by one (with holy patience!) all the sections introduced.

I do not attach the design, leaving to you the pleasure of experimenting the solution.

 

[meacmae]

thanks guys with your advice (especially the last) I managed to get the solid quickly.
ps. if the blocks used in the measure explode and select them all with the window do before.
Thanks again.

 

[Cristallo]

I tried crystal has followed your method but I find it difficult.
I can't properly rotate the profiles along the curves

follow the steps from step-0 to step-3 and you'll get the result shown in step-3b

Following the idea of crystal on the perpendicularity of the sections to the trajectory, I suggest another road.[cut]2- Measure command: insert a congruous number of blocks with the alignment=yes option[cut]

The josh process is also largely correct, but has limitations.
alignment becomes automatic and here you earn a lot of time.
the problem remains the step.
no one guarantees that, chosen a x step, in the curve you understand a number of congruous sections.
to force a fairly precise trend, we will have to have a fairly narrow step, but this means that to have we say 6 steps in the curves, along the straight strokes we will have another 100 absolutely useless steps.
and they are all sections that after we will have to go to "loftare" (and then to calculate by autocad), after having selected them una ad una.

Moreover with the method of step we would not have (unless a dose of hyperlucent or a preventive hand calculation) than the terminal section France with the end of the pline3d.
less (unless you have chosen a step with dose of hypercarpiata luck screwed to the right with wind refola on the left :biggrin we will have that the intermediate sections will understand us accurately at the beginning and end of straight lines.

josh teaches me that the best method is "maximum result with as little effort as possible".
his method door almost zero the initial effort of the search for perpendicularity, but introduces the additional work next both human (select all intermediate sections one by one), and machine (calculate all lofts between sections) obtaining an all-lined solid long z that presents approximations related to the "discretization" of the path by measure.
my method force all starting points and arrival on straight strokes, "discretizzando" manually the only curved traits.
a little more time for the search for perpendicularity, to which however it copes a precision in absolute terms and a solid reduced to the minimum terms always respecting the total precision.

I said this I'll end up here, otherwise I would have to ask the owner of the site how much I pay to make a tutorial to publish on the site:biggrin::mixed:

 

[doking]

follow the steps from step-0 to step-3 and you'll get the result shown in step-3b

I understand however known that the profiles are all aligned to the circle that is placed on the global uucs, in practice the center of the profile ray is not coincident to the guideline that is oblique compared to the blobal uucs, they are all on the z axis while the guide line is not. I think I understand you say you leave them like this.

as we are working with global ucs, the z differences that autocad will fall into the points will not be considered. according to that autocad plane can rotate the object exclusively along a trigonometric circle lying on the xy plane, rotations in the xz and yz planes are not allowed (unless to use the wheel3d command, but we will not use it).

I interpret well?

 

[Joseph]

no one guarantees that, chosen a x step, in the curve you understand a number of congruous sections.
to force a fairly precise trend, we will have to have a fairly narrow step, but this means that to have we say 6 steps in the curves, along the straight strokes we will have another 100 absolutely useless steps.you can not neglect to place a number of sections even along the straight sections, when you want to use the "normal option to all sections" because, as you see, also placing one section in the central section, the solid moves away from the trajectory.
unless you want to use the "regatta" option; but in this damage the inaccuracy along the curved traits would be even greater.

but, I repeat, we are doing "the accounts without the bear".

p.s.
If this situation should be repeated several times (in this case the time factor would become important if the number of sections were high), then you could use the drafting of a code (lisp or similar) with which to automate the storage and selection of the individual sections.

 

[doking]

I've been able to
thanks guys:finger: