Requests &...from Pilou:)
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 From:  Frenchy Pilou (PILOU) 5 Nov 2006  (3 of 80) 
207.3 In reply to 207.2 
About the Curve start /curve End on a rail or path is this image more clear ?
Of course curve Start, Curve End , and rail -path) can be any curve !
Attachments:
Attachmentcurves.jpg
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 From:  Frenchy Pilou (PILOU) 6 Nov 2006  (4 of 80) 
207.4 In reply to 207.2 

Thx for the hemi sphere methods

About problem of name of file and IGES format here just inside MoI !
Try that
Make a "cube solid" save as name "Cube" in 3dm format
Now always in MoI "save as" IGES format, same name "Cube", MoI (windows(?) said "cube.3dm" "soon exist !!!!
"would you erase it Yes/ No", if Yes the cube is saved in 3Dm format not in IGES format???
Idem if you make an "Export" IGES
Now, no problem is you take for example "Cube1", now the IGES file is cool exported or saved :)
I believe that is more a problem of windows file names management than a MoI bug :)

And it's for me reproductible at any time!

Ps For the Tabkey for Top / Bottom yes anything you want :)
But we will be able to use the "bottom view" as the "Top view" for draw, move objects etc...?

EDITED: 6 Nov 2006 by PILOU
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 From:  Frenchy Pilou (PILOU) 6 Nov 2006  (5 of 80) 
207.5 In reply to 207.2 
< do you consider a volume and a solid to be different things?

In the reality yes :)
You can weigh a solid, not a volume :)
Of course here the soap bubble is a metaphor of the "volume" marble is the "solid" :)

EDITED: 6 Nov 2006 by PILOU
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 From:  Frenchy Pilou (PILOU) 6 Nov 2006  (6 of 80) 
207.6 In reply to 207.2 

About A "close" surface curve (maybe it's a dream )

<How do you mean? Can you show an example?

Just an automatic function "close" some hole (s) in an object when you select the hole 's edges
Seems quasi impossible :)
Maybe by some "Sweeps" edges one by one :)

EDITED: 6 Nov 2006 by PILOU
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 From:  jbshorty 6 Nov 2006  (7 of 80) 
207.7 In reply to 207.6 
I'm sure you know this, but for this box you only need to "untrim" these surfaces along the 3 edges. A new tool would not be necessary in this case... If the "hole" extends beyond the boundaries of the untrimmed surfaces, then you would need something like Rhino's "patch" tool. Or a network surface if just 3 or 4 edges define the hole boundary. No?

jonah
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 From:  Frenchy Pilou (PILOU) 6 Nov 2006  (8 of 80) 
207.8 In reply to 207.7 

:)
My simple cube was just a "concept" for show an hole :)
This one show maybe better what is a "Yellow curve" closing an object :)
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 From:  Michael Gibson 6 Nov 2006  (9 of 80) 
207.9 In reply to 207.3 
> About the Curve start /curve End on a rail or path is this image more clear ?
> Of course curve Start, Curve End , and rail -path) can be any curve !

Hi Pilou, you can use sweep for this, choose the start and end curve, run Construct / Sweep, then select the rail.

But it is more typical to have the rail running down the center of the profiles, it is somewhat easier to control things that way. Sweep with one rail will slide the shapes along the path, and it will reorient them to follow the path. When you have the rail only on one side of the shapes, the other end of the shape tends to move quite a bit when it is reoriented (kind of like it swings around a lot since it is far away from the path). With a path down the center the shapes swing in a more "balanced" way around their center points. Let me know if this needs more explanation.

But you probably won't get a very good result from the curves in your image, there is just a little bit too many things going on there, there is the curve of the path and then having a circle change into a rectangle which is a major shift. To control the resulting surface better in this case you would normally need to use some more curves to define what you want better and maybe build it in a few sections.

- Michael
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 From:  Michael Gibson 6 Nov 2006  (10 of 80) 
207.10 In reply to 207.4 
> re: SaveAs IGES

Hi Pilou, thanks for the additional explanation, I understand now.

What is happening is when you switch the "Save as type" drop-down to IGES, the current file name is remaining as "cube.3dm". So when you go to save it is using this file name.

This is actually a problem with the windows file management, it is just the way it works by default. However, it should be possible for me to customize it to make it better - in this case the file name should change to cube.igs when you change the drop-down to IGES.

As a quick workaround right now, in addition to changing the file type drop-down, you can go in and edit the file name "cube.3dm" to be "cube.igs", and then it will save as IGES format.


> Ps For the Tabkey for Top / Bottom yes anything you want :)
> But we will be able to use the "bottom view" as the "Top view" for draw, move objects etc...?

Sorry, I didn't mean the tab key on the keyboard, I mean the view tab-style control near the bottom of the screen that says "Split | 3D | Top | Front | Right". If you clicked on Top in there when it was already active, it could then switch to Bottom. It would behave the same as the top view did for drawing, etc... except for having the reverse view.

- Michael
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 From:  jbshorty 6 Nov 2006  (11 of 80) 
207.11 In reply to 207.8 
again, it looks to me this could be done easily by untrimming the two main surfaces, and then retrimming where they intersect. but what should happen to the 9 surfaces which also share this highlighted edge? They will have no edge to connect with. should they be extracted? Should they be deleted? If this were a closed volume, then what is expected to happen?
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 From:  Michael Gibson 6 Nov 2006  (12 of 80) 
207.12 In reply to 207.5 
> > < do you consider a volume and a solid to be different things?> In the reality yes :)
> You can weigh a solid, not a volume :)

But you can calculate the weight of a volume for a particular material, just with one multiply.

Like you can say "this volume of gold will weigh this much."

But CAD is typically more concerned with the topology and forms that define a shape, not so much with what material is inside of it.

Normally in CAD, a solid means an object that has a defined volume.


- Michael
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 From:  Frenchy Pilou (PILOU) 6 Nov 2006  (13 of 80) 
207.13 In reply to 207.9 

No it's not exactly that: Sweep is not suffisant :) Look after the object C, it's near the solution :)
a mix of A, B ,C
Another time, I believed that a Sweep with one or two rail should take juste one curve :)
And not a cuve somewhere and another in the other part of the plan :D

EDITED: 6 Nov 2006 by PILOU
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 From:  Michael Gibson 6 Nov 2006  (14 of 80) 
207.14 In reply to 207.6 
> Just an automatic function "close" some hole (s) in an object when you
> select the hole 's edges
> Seems quasi impossible :)
> Maybe by some "Sweeps" edges one by one :)

As Jonah mentioned, there is a NURBS tool called "Patch" or "N-sided Patch" which is usually used as a hole filling mechanism. MoI will have this eventually but I'm not sure exactly when.

But even that tool is more suited for filling an area that is rather smooth in shape, it is not good for filling in a very large area with very irregular shapes.

If you have a very large hole with irregular boundaries, there is just no single definition of what the shape of the surface should be in that area. So it is not really possible to have a completely automatic system to fill any gap, any more than it is possible to have a system to automatically create the initial model's shape from nothing.

Just in the same way that you create the initial shape by drawing curves and constructing surfaces, you also need to create the filling surface in the same way, you have to draw curves and define what type of shape you want to have in that area (just as you are suggesting with doing sweeps and such).

To automatically fill in something complex like you're showing would require a lot of "artifical intelligence" on the part of the software... This level of AI isn't going to be ready anytime soon! :)

- Michael
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 From:  Frenchy Pilou (PILOU) 6 Nov 2006  (15 of 80) 
207.15 In reply to 207.14 

> This level of AI isn't going to be ready anytime soon! :)
This is maybe a good new :)
Thx for All!
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 From:  Michael Gibson 6 Nov 2006  (16 of 80) 
207.16 In reply to 207.13 
> No it's not exactly that: Sweep is not suffisant :) Look after the
> object C, it's near the solution :)
> A mix of A, B ,C

To do it just in one sweep, you would have to use a path more like this:



But it is a complex enough shape with those sharp swinging ends that are bunched together, that you would probably need to construct it in several different parts just as you have shown...

As a shape gets more complex with different corners and bunched-together areas, the less likely it becomes that you will be able to create it automatically with using only one application of one single tool. It is normal that you will need to break such things up into smaller pieces.

Sometimes it is also possible that you could use some additional shape curves to help define it better. With your initial curves, MoI just doesn't know that the initial shape is supposed to swing around more rapidly than the curve is turning.

- Michael
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 From:  Frenchy Pilou (PILOU) 6 Nov 2006  (17 of 80) 
207.17 In reply to 207.16 
Yes :)
All that seems reasonable !
The discovery of the day will be the 2 separates oposite curves along the Sweep rail !!!
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 From:  Frenchy Pilou (PILOU) 7 Nov 2006  (18 of 80) 
207.18 

I discover again than a "Sweep" can have any numbers of different profils !
So the "icone" of "Sweep" is some misleading :)

A funny & terrific thing is make a sweep and after select the rails / show Points, Add Points and move the points!!!
In this case (show points enable) does exist a trick for move the last point as a "tangente" ?
(only warm points, and axes seems work not the "tangent" (?) )
For the moment the only I found is draw another line as "tangent" and return to the point for move it on this new line ! It's no so bad :)

EDITED: 7 Nov 2006 by PILOU
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 From:  Michael Gibson 7 Nov 2006  (19 of 80) 
207.19 In reply to 207.18 
> In this case (show points enable) does exist a trick for move the last point as a "tangente" ?

One easy way is to just draw a line like you mention.

Another way is to select your point, then use the Transform / Move tool. Then drag a construction line along the tangent direction that you want.

The Transform/Move command can sometimes be a better way to move things with precision, since the existing object remains snappable, and you can also create construction lines with it easier than you can with dragging style movement.

- Michael
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 From:  Frenchy Pilou (PILOU) 7 Nov 2006  (20 of 80) 
207.20 In reply to 207.19 

Yes!!! It was the "move tool" ! That rocks! THx!
Another time no think to take a "tool" for move a point, thinking that mouse's moves (or Pen's moves:) were sufficent !

Another little thing :)
That is a tangente with the last point of control "out" the curve
Is it the same tangent than a point who will be near the extremity and the extremity but "on" the curve?
Seems yes, but I ask the question :)

EDITED: 8 Nov 2006 by PILOU
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 From:  Michael Gibson 7 Nov 2006  (21 of 80) 
207.21 In reply to 207.20 
> Is it the same tangent than a point who will be near the extremity and
> the extremity but "on" the curve?
> Seems yes, but I ask the question :)

Yes, the way NURBS curves work is the end tangent direction of the curve is defined by the direction of the last 2 control points.

But just to be clear - a point on the curve that is near the end but a small distance away from it will not have this tangent quite yet - it is only the very end of the curve that has this tangent. But I think that you have shown that in your graphic. As you move closer and closer along the curve towards the end point, the curve's tangent at that point will get closer and closer to the line between those 2 points.

- Michael
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 From:  Frenchy Pilou (PILOU) 7 Nov 2006  (22 of 80) 
207.22 In reply to 207.21 

Yes very very closer but not the same :)
In the file linked...
There are one big curve "curve", a little curve "straight" near the extremity and "on" it, a big curve "straight" tangente to the little curve
I had no preconceived ideas of that, now I am fixed :)
That maybe good to know that in particular extrem conditions :)
So it's better to draw out a curve "curve" by the function "Extend" than by an tangent aligment to the control's points :)

So MoI is a very cool tool for verify geometry concepts :)

Ps Is it possible to have somewhere the Zoom status? (with some decimal numbers :)
I have made that : a curve extend to a line, and an extension by the alignment of the control point (see divergence jpg)
I made some mouse's wheel actions before see a "divergence" :)
What is the "clickety clack zoom dimension" of a wheel action?
I made as an approximation of 125 "single" clikety clack :)

PSs Have you plan an "intersection Snap On" with a surface when you start a line ?

EDITED: 8 Nov 2006 by PILOU

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