simultaneous X and PERP snap line to curve?  1-20  21-27

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 From:  brash
5767.1 
Hi,

Need a line perpendicular straight and curve simultaneous. I draw constraction line in straight direction, > relocate cline > move on curve but don't see Perp mark. Object snap/Pepr is on.

Pls help!
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 From:  Frenchy Pilou (PILOU)
5767.2 In reply to 5767.1 
Full screen of your view (for a more easilly view of the Snap Perp on the curve) because when you zoom your first click on the curve can be becoming out of the screen ! )
Disable Grid Snap and move your mouse with the helper line untill see Perp Snap ;)
Re Enable Grid Snap if needing

You can draw this Helper line before the first click of the Line, after the first click of the Line on the curve...(and before the last click... of another function used)

So you have the choice to click the first point of the Function Line on the curve or not! ;)

Here the first click of the Line function is not made ---just the first click of the Helper Line
--- I am waiting the second fixed click of the Helper line for draw the two clicks points of my line! --- suspense :)
And because I can move (If I want) my Helper Line on another point of the curve and Reorient it for a New Perp Snap!!!

Like this I can draw any number of perpendicular Helper lines along my curve for choice the better one for my wish !

EDITED: 14 Mar 2013 by PILOU

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 From:  Michael Gibson
5767.3 In reply to 5767.1 
Hi brash - There are several different kinds of perpendicular cases, and it's not really very clear to me which kind you're actually referring to, maybe if you could include a graphic that would help illustrate that might help.

Perp object snap will find a perpendicular for a line from the previous picked point onto a curve. So for example when you're drawing a line and placing the second point of the line, it will find a point perpendicular to the curve close to your mouse from the first point of the line that you picked.

When you are doing a construction line relocate, the "previous point" in that case will be the first point that was picked in creating the construction line.

But I'm not sure if you are talking about having perp snap engaged for the cline relocation step itself, or are you talking about doing some perpendicular snap after you have finished relocating the cline?

If you want to have a perpendicular that's coming off from a curve like Pilou shows above, then that's done with perpendicular "straight snap" - you need straight snap turned on for that one to get triggered. Perp object snap controls kind of the other direction, when you are approaching a curve from a different point not when you are going away from a curve.

I think I need some more information from you to clarify what you're looking for though, I don't understand which particular kind of snap you're looking for in combination with relocating the cline.

- Michael
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 From:  brash
5767.4 In reply to 5767.3 
Thanks PILOU and Michael!

In circle it is easy from Cen to y-direction. How about curve without center?

EDITED: 14 Mar 2013 by BRASH

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 From:  Frenchy Pilou (PILOU)
5767.5 In reply to 5767.4 
Just make a wheel zoom! And move your zoomed circle to the top screen before make anything! ;)

Or Make a first general perpendicular Help line, then zoom then draw your 62.2 Line whished

EDITED: 14 Mar 2013 by PILOU

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 From:  brash
5767.6 In reply to 5767.5 
the megazooom! I think here must be Perp mark. 62.62 i find on center of the circle :) How i can make it without center?


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 From:  Michael Gibson
5767.7 In reply to 5767.4 
Hi brash, thanks for posting the pictures!

Unfortunately I'm still very uncertain what in particular you're looking for....

You seem to be creating a y-direction construction line but at some arbitrary location, is that correct? Then you are interested in finding the distance from that construction line to the center of the circle? This is one part that is confusing me, why are you looking for that distance when you do not seem to have placed the initial construction line at any key location itself?

Also I don't understand what kind of center point distance you want to target on a "curve without center" - if the curve lacks a center point which point do you wish to measure then, how can a center point be targeted when there is no center point?


Is it that you are trying to measure a particular distance?

If you are having a problem with measuring the distance on a curve that is not a circle could you maybe show a screenshot of that problematic curve with the distance you are trying to measure labeled on it?

Sorry but I am still not at all clear about what you are looking for yet...


If you are looking to measure a distance from a vertical line through the circle's center point then maybe you want to be creating 2 construction lines - one vertical one going through the center point and then drop a second one from your point of interest onto that vertical line...

- Michael
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 From:  Frenchy Pilou (PILOU)
5767.8 In reply to 5767.6 
Sorry I had not precised!

Not this Zoom In ! :)
The Inverse Zoom Out ! Mousewheel in the other side!
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 From:  Michael Gibson
5767.9 In reply to 5767.4 
Hi brash, one of your screenshots shows this:




But that is expected that you will not find a "perp" snap in that spot - perp snap in that case of relocating a construction line will find this perpendicular here from the previous point going towards the curve:





Are you possibly trying to locate areas on a curve where the curve tangents are aligned to the x or y axis directions?

If so then check out this recent post about doing that:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5758.1


The single "Perp snap" will not give you the point you are looking for there - but there are other methods you can use to get it, either select the curve and use the BoundingBox command (set up either a keyboard shortcut for it or hit the tab key and type in BoundingBox and push enter) to generate a bounding frame which will then have intersection points at the spots you want, or set up parallel lines or construction lines and use perp/perp (note - the double perp on both sides, not just single perp snap) as shown here in blue:

http://moi3d.com/forum/index.php?webtag=MOI&msg=3042.14
http://moi3d.com/forum/index.php?webtag=MOI&msg=3042.13

- Michael

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 From:  Michael Gibson
5767.10 In reply to 5767.1 
Here's an example of finding a point on a squiggly curve that will be going perpendicular to the y axis direction using perp/perp snap:




To do it with this method, first put in a line or construction line going in x-axis direction. Then place the first point of the line somewhere in the general area where the perpendicular point is at, then when you place the second point onto the x-axis line, move your mouse around until you find the perp/perp point, it will usually be a slight distance to one side of the single perp snap. Once that is located you will see a "Perp/Perp" label shown on both the first and the current point of the line (not just only on the current point like regular "perp" object snap) - this is a special snap that not only modifies the current point but also modifies the previous point as well, that's why the labels are shown on both the base and the target point for this one. Because it modifies the previous pick and not just only the current point it's only enabled for some particular commands that are like line drawing, like the line, polyline commands and when drawing (not relocating) construction lines too, but since you can generate construction lines in any drawing command you can use them to get it when needed in other commands.

The other way is if you use the BoundingBox command you will get a frame around the curve and it should then have intersection snap points at these locations as well.

In the future I'd like to add some way to make individual snap points show up at these locations, but it takes some calculation to figure these out on squiggly curves and it's not always so good to have too many snap points all going at the same time since it can get in the way of more freely placing points. So maybe it would be something that you would go into an extended properties dialog to turn on or off those snap points on a particular curve maybe. But in the meantime one of these other methods can get you those particular points as well.

I hope that I didn't misunderstand what you are looking for...

- Michael

EDITED: 14 Mar 2013 by MICHAEL GIBSON


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 From:  brash
5767.11 In reply to 5767.9 
sorry my english is not native.
I need find perpendicular to curve and parallel to straight. both points are very closly but I need accuracy.)))














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 From:  Frenchy Pilou (PILOU)
5767.12 
You have an infinity of Y Perp along this curve!

Choose first the point you want on the curve!
---
Pilou
Is beautiful that please without concept!
My Gallery
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 From:  Michael Gibson
5767.13 In reply to 5767.11 
Hi brash,

> I need find perpendicular to curve and parallel to straight. both points
> are very closly but I need accuracy.)))

You may not have seen my above posts since you were probably writing a reply at the same time I was posting them.

Check up above for how "perp/perp" snap works - I think that's what you want. Place a line or construction line along the x-axis direction below your curve. Then you will be able to draw a line or construction line and engage "perp/perp" snap to find a point on the curve where the curve perpendicular matches the perpendicular to the x-axis direction. That will be a line at a point on the curve where the curve perpendicular and y-axis direction are the same.

There is a video screencap and more explanation in the above posts.

Or also if you use the BoundingBox command to generate a frame around the curve you will then have some intersections at the points you want as well.

- Michael
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 From:  brash
5767.14 
Yes, I need this! perp/perp snap to both sides. I move parallele but must perpendicular))))
Thanks so much!


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 From:  Michael Gibson
5767.15 In reply to 5767.14 
No problem brash, I'm glad that does what you need! Sorry I did not understand what you were asking about at first.

Also, when using perp/perp snap the initial point on the first curve must be somewhere in the general area (like with 50 pixels or something like that) of where the actual final point will be at. That helps to avoid it being triggered accidentally all the time, basically it only triggers if there was a shared perpendicular line in the screen area nearby both the first and the second pick.

If you have placed the first point very close to where the final perp/perp snap will be, you will usually find the activating point on the second pick to be just slightly to one side or the other of the "single perp" snap. You will know when you have activated perp/perp since you will see the label switch to "perp/perp" and it will also show on both points to indicate that both the first point and the second point are being modified by this particular snap.

The "single perp" object snap is different since it snaps the current point only, finding the perpendicular line coming directly from the base point. Perp/perp only uses your picked points as guides for where to look on the curve and the actual perp/perp snap locations come from a calculation that finds a shared perpendicular line between the curves.

- Michael
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 From:  brash
5767.16 In reply to 5767.15 
Thanks again, Michael!

Pls note my logic as simple man as I showed in first pics ;) To draw helper line in need direction and relocate it to find perp to the helper line on curve. maybe possible add this function "perp locator"?
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 From:  Michael Gibson
5767.17 In reply to 5767.16 
Hi brash,

> maybe possible add this function "perp locator"?

Maybe, but I'm not sure how it would work for just regular picks which in general only have a "previous point" defined for finding perpendiculars. Do you mean it would be added only specifically to the construction line relocation only? That's getting pretty highly specialized, and it might be tricky to give a good label to actually show what was happening there, I can't really just say "perp" because the regular "perp" snap does something different than that (using the direction from the previous point).

- Michael
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 From:  BurrMan
5767.18 In reply to 5767.17 
I would solve his particular workflow desire with "Keep C-lines"....

On that note, Michael, has anything changed enough about what Paul's custom "construction Line" command does that it could be altered to include the c-line edit option on the kept lines?

So rememeber that the initial inaccessibility to the kept c-lines (or maybe the visual that they have been "activated or picked") yet still "transformed with the regular tools" (They do actually get picked like objects. with a name and a style). Maybe that can now be added to it?

Thanks

EDITED: 14 Mar 2013 by BURRMAN

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 From:  Michael Gibson
5767.19 In reply to 5767.18 
Hi Burr,

> I would solve his particular workflow desire with "Keep C-lines"....

But he's looking to find a location on a curve where the curve perpendicular matches a particular cline direction - that would be a new kind of snapping function (but one that can currently be done by perp/perp snap instead), just keeping clines doesn't give that.


> On that note, Michael, has anything changed enough about what Paul's custom
> "construction Line" command does that it could be altered to include the c-line
> edit option on the kept lines?

No, not currently - right now it is built into that little pop up menu that it is implicitly editing (by things like reorient or relocate) the last created cline.

- Michael
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 From:  BurrMan
5767.20 In reply to 5767.19 
I was editing my post while you were posting back.....


""""""""""But he's looking to find a location on a curve where the curve perpendicular matches a particular cline direction - that would be a new kind of snapping function (but one that can currently be done by perp/perp snap instead), just keeping clines doesn't give that.""""""""""""

Yeah, I saw that and was thinking of the perp/perp, but he seems to be wanting to do it kindof "backwards', and I thought that the keep c-lines would let him do it. It's kindof the same as drawing an actual "line first", then having that to work with.
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