Pregnancy avoidance

Wo3Dan

rv1974,

Like Chris I don't see this as a bug. The arc remains an arc, all its segments coplanar. What you are after is probably the helix by moving a single vertex.
That will not happen. The helix does not have coplanar segments. You need to do this manually.

Wo3Dan

Edit: the yellow curve is either the 3D helix mentioned above or a coplanar curve created by intersection with a simple face. No arc involved.

mac1

rv1974
You are trying to 'morph" an arc into a 1/4 section of elipse. A intersection of cylinder and plane with the plane perpendicular to the axis of cylinder is a circle, non perpendicular will be a ellipse and arc will not fit that very well. If you draw a triangle using the cylinder center(base) and the two desired end points gives you a plane ref which a section plane can be algned to and intersected with the cylinder to get what you want. You will have to first use the section tool option to make the slice a group to get the intersection.

rv1974

Just thinking aloud.. The original SU product placement is urban design\architecture. Historically
the plan (plan view) is the 'alpha and omega' of the design process. I really can't see any benefit\use in curve bulbing. It appears there's a good niche for some ruby geek- the 'Interpolated_vertex_move.rb'.. or something like that

notareal

I would use ...zorro!

rv1974

@notareal said:

I would use ...zorro!

for Seppuku?

notareal

@rv1974 said:

@notareal said:

I would use ...zorro!

for Seppuku?

I don't think that so drastic method is in need
Zorro 2 http://forums.sketchucation.com/viewtopic.php?f=323&t=16038
Tip for use http://forums.sketchucation.com/viewtopic.php?p=216509#p216509

rv1974

Take the arc's end and drag it upward. Take a look at the twisted result in the top view. Zorro.rb is a totally diffrent story- the cylinder in the example picture is just a visual aid.

xrok1

you would have to rotate it to keep the original radius, what your doing by moving one end is changing the radius.
you could also draw your arc from A to B1 and set whatever radius you need or snap the radius to existing geometry.

rv1974

Take a look at this skp file. Hope it'd explain the problematics better then my broken english does.

ramp.skp

jeff hammond

like wo3dan said, that's probably helix that you're after.. when you move the vertex of the curve, it stays proportionally correct...

[edit] oh, just saw your latest example.. a little different i guess.

helix.skp

jeff hammond

i haven't tried it but you might want to check out slope edges in the 1001bit suite
http://www.1001bit.com/products/slopeedges.shtml

notareal

@rv1974 said:

Take a look at this skp file. Hope it'd explain the problematics better then my broken english does.

This explains the need much better... nothing that zorro can do. But if the issue where like you originally posted, then it's a different story.

rv1974

Hi mates! As I can see the disscussion went in the wrong direction (mea culpa).
I have no problem to build this damn ramp and the things like that (with at least 2 difftent ways:
1.extrude plan outline->surface tools->loft (more correct)
2.followmeandkeep.rb->interset with extruded plan (less correct))
Both ways take time and efforts. The aim of this thread was to catch some ruby maker's eye to
the neat (IMHO) idea- to move curve's vertexes in a kinda 'interpolation mode' and without plan distortion, or maybe to find
the already existing script.
Sorry for the lack of clarity

notareal

Have you looked on various plugins by kirill2008 or maybe SketchyFFD by CPhillips? I could imagine that those could be used in some degree.

Jean Lemire

Hi folks.

See this SU file for ideas.

Helix or ellipse or arc.skp

xrok1

i was messing around with this and it would appear you need a compound curve to do what you need so you can't very well expect SU to do it, or a plugin unless its very complex. you'll need some 3d reference dimensions and just draw it 1 segment at a time.

fredo6

@rv1974 said:

Yes I know. But it's too complicated to build additional surfaces and then clean it.
All I want is to move vertex in distortion free mode .

Fredos plugin is not always work smooth to me:
http://screencast.com/t/M2Q1NTMzZWUt

TOS has currently a problem on closed surfaces.
Try to remove the bottom of the cylinder and it should work.

Fredo

rv1974

@unknownuser said:

@rv1974 said:

Yes I know. But it's too complicated to build additional surfaces and then clean it.
All I want is to move vertex in distortion free mode .

Fredos plugin is not always work smooth to me:
http://screencast.com/t/M2Q1NTMzZWUt

TOS has currently a problem on closed surfaces.
Try to remove the bottom of the cylinder and it should work.

Fredo

Yeah no worries I've found workaround. And thank you for the TOS once more!

rv1974

This is close to what I want in SU:
http://screencast.com/t/ZjIzMjIzZ
2 main things: interpolation and no plan screwing.
P.S. Even more:
http://www.youtube.com/watch?v=GuXOO-Ofi0Q&feature=player_embedded
You could skip the russian intro and gostraight to ~2.00

notareal

Those where like sculpting of polygons. Wonder if Sculpt Tools would do the trick? Still for me SketchyFFD sounds like a good option or kirill2008's Control points, did you try those?