Circle Tangent on a sphere ?
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 From:  Frenchy Pilou (PILOU)
5435.17 In reply to 5435.15 
<< a demo of doing a construction line along surface normal:
Yes this gives the helper line on somewhere must be the center's circle inside the sphere
but not the deepth... ;)
Not yet found for example the use of the Orient only for place the circle on this line...and more helper lines for find the good point ...I must explore more :)

EDITED: 29 Sep 2012 by PILOU

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 From:  Michael Gibson
5435.18 In reply to 5435.17 
Hi Pilou,

> Yes this gives the helper line on somewhere must be the center's circle inside the sphere
> but not the deepth... ;)

Well you could use it for example to help draw a cylinder that had a central axis perpendicular to the surface of the sphere but partially submerged inside of it rather than sitting exactly on the tangent plane. Then with the cylinder intersecting the sphere you can intersect them.


> Not yet found for example the use of the Orient only for place the circle on this line..

It will be difficult to find the exact location to position the circle doing it that way - I'd recommend instead using a projection method so that you don't need to worry about the positioning in a manual way like that.

- Michael
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 From:  Frenchy Pilou (PILOU)
5435.19 In reply to 5435.18 
<< Well you could use it for example to help draw a cylinder that had a central axis perpendicular to the surface of the sphere but partially submerged inside of it rather than sitting exactly on the tangent plane. Then with the cylinder intersecting the sphere you can intersect them.

it's that a sort of this I made some post above ;)
<< I can also draw a cylinder from the center of the sphere passing by the point I want then Curve / Intersect and killl the cylinder ! ;)

I don't deseperate to find something easy with the helper lines but for the moment
my above method of the move the Edit frame in Front view + Orient copy everywhere is very satifying and seems the more easy to do (for me) :)

EDITED: 29 Sep 2012 by PILOU

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 From:  bemfarmer
5435.20 
So to generalize, how would it be possible to copy a clothing button, and place it tangent to a surface, such as a sphere, or catenary of revolution, with the "center" at an on-surface point of the surface?

Using the ArrayGem script with a tiny line segment, instead of a point object does such a copy.

Is it possible to modify the ArrayGem factory, to use a PointObject, instead of a Curve?
Changing objectpicker.allowCurves() to objectpicker.allowPointObjects() in the script, does not work, so the change would have to be in the ArrayGem factory, (I think).



EDITED: 23 Aug 2014 by BEMFARMER

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 From:  Michael Gibson
5435.21 In reply to 5435.20 
Hi Brian, it should probably not be difficult to modify the ArrayGem factory to work like that, I'll take a look at that tomorrow.

- Michael
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 From:  bemfarmer
5435.22 In reply to 5435.21 
Hi Michael, I've just been messing around, practicing MoI. Ideas may or may not be useful or practical.
Seems like the orient command does the trick well.
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 From:  bemfarmer
5435.23 
.

EDITED: 30 Sep 2012 by BEMFARMER

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 From:  Frenchy Pilou (PILOU)
5435.24 
Ok I have successful with use only the Orient and helper lines ! ;)

Same trick than my previous try for inspiration :)

Circle given is drawn somewhere on the ground: click on it for have the radius
Call the Orient
In view Front draw a vertical helper line from the top of the sphere
Move it of the radius given of circle
Redraw one vertical line at the Top of the sphere
Draw an horizontal helper line from the intersection of the previous vertical helper line of the radius and the generator curve of the sphere

Et voilĂ  ! :)
I can draw the Orient Circle at the good deepth!
After that just now take the top of the sphere as Base Origin!
And copy it anywhere!



EDITED: 30 Sep 2012 by PILOU

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 From:  bemfarmer
5435.25 In reply to 5435.21 
Michael, did you look at the possibility of using the ArrayGem factory with Point Objects, rather than
lines or curves? (While preserving the On Surface normal orientation?)

Thank you,

Brian
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 From:  Michael Gibson
5435.26 In reply to 5435.25 
Hi Brian, yup using points with ArrayGem is set up for the next v3 beta - you won't have to do anything custom you will just be able to select point objects in addition to curves for the target objects in the regular command.

- Michael
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 From:  bemfarmer
5435.27 In reply to 5435.26 
Should be very useful! :-)
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