Aligning Images

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 From:  Wlawton
7725.1 
As a newbie one if the biggest problems I have is how to get started. In particular I cannot seem to properly align the 3 view images. I have searched the forums and have not seen any tutorials on properly aligning a 3 view drawing so the modeling process can begin. In several of the tutorials they usually start after the 3 views have already been aligned and placed. Could someone help by showing how this is done. I have included 3 typical images for a top, side, and front view of an airplane.
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 From:  Michael Gibson
7725.2 In reply to 7725.1 
Hi Wlawton, there are a few demos of image alignment functions here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1982.9
http://moi3d.com/forum/index.php?webtag=MOI&msg=1982.6
http://moi3d.com/forum/index.php?webtag=MOI&msg=2501.14

Probably the easiest way to start before you place any images is to draw in a few lines which match the lengths you have in the bitmaps.

So for your case, draw in a line 28.5 meters long in the Front view, another line 7.87 meters long in the Right view, and another line 29.39 meters long in the Top view.

To draw a line of a certain length, start the Draw curve > Line command, and then place the first point of the line, and before placing the second point type in your desired length and hit Enter. That will activate "Distance constraint" and the next point will be placed at that speciifed distance away from the first point. After you have drawn a line if you wish to center it, grab it by its midpoint and drag it to the center axis line.

Now the next step is to place the images in - place each image in to the corresponding Top, Front, and Right views by using the View > Image command, push the "Add" button in the command options area to pick an image and place it in the proper viewport. Just place it at a rough size for now, the proper sizing will come in the next step.

Once the images are in the viewports, let's now size them to the proper sizes. To do this stay in the View > Image command, and use the "Align" function, there's a button for it in the command options area in the upper right corner of the main window, and the first link above shows a demo of it being used. The way the Image Align works is you first select which image you want to manipulate by clicking it in the list of images that is shown above the buttons, do that before you actually launch the Align function. Then once you are doing the Align you will pick 2 points on the image right on the registration line in the image that shows the distance. Then pick 2 points snapped on to the line in the model that you drew previously. If the side-view silhouette lines of the other images are getting in your way and confusing you then hide the other images before doing the align of that particular image. To hide an image select it in the list and then use the Hide button below the list.

Once you have used the View > Align function like that, the images are all now at the proper size with the distance marked in the image matching up to the same distance in the model space.

Now you need to position each image - you do that by staying in the View > Image command and clicking and dragging on an image, that will move it around. You can click on a corner, edge midpoint, or center of an image to drag from those key points or otherwise if those don't match to a good point on the image you will instead just drag right on a spot of the image like on the bottom of the wheel and move that until it is visually right above the x axis line, or possibly some other reference line that you can draw in before going into the View > Image command.

For your case here, maybe position the Front and Right views dragging the bottom of a wheel to the x-axis line, and then place a line or a circle would be good at the tip of the nose cone (I drew a circle by placing the first point of the circle in the Right viewport at the tip of the nose, then finished the circle in the Front view, that now gives you a common reference you can see in 2 views and you can then drag the Top view image to match the nose up to it.

If you need to rotate an image, when you are inside the view > Image command move your mouse over the rotation grip control that is part of the "Edit frame" that surrounds the image and drag it to rotate it.

Hope this helps, let me know if you get stuck on any step.

- Michael
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 From:  Frenchy Pilou (PILOU)
7725.3 
Cut first your images at the extremities of your object in their 3 directions!
Just draw 3 rectangular plans with dimensions of your 3 views trimed of your object then call/draw your images inside! )

(here imaginary 3 plans)

EDITED: 17 Nov 2015 by PILOU

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 From:  Wlawton
7725.4 In reply to 7725.3 
Dear Frenchy,

When you say that I should cut my images at their extremities would you look at the three new images and tell me if that was what you were thinking?
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 From:  Frenchy Pilou (PILOU)
7725.5 In reply to 7725.4 
Yes like that if you have made precise fit of dimensions! ;)
And you can put any number of images!
Have happy modeling!

EDITED: 17 Nov 2015 by PILOU

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 From:  Elang
7725.6 
For image references placement, MoI3D has the most flexible and easiest way...
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 From:  Wlawton
7725.7 In reply to 7725.5 
Dear Frenchy,


Would you mind taking a look at this alignment and tell me if you think it is okay before I start the modeling.

Sincerely,
Bill
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 From:  Frenchy Pilou (PILOU)
7725.8 In reply to 7725.7 
Your images are not with your file! ;)

If I load your last previous images there are not trimed at the extremities! )

More your trim will be precise, more the modeling will be easy! )

Of course you can use the Align function with the 2 points Source / Target
if you don't want make some trim but...

EDITED: 18 Nov 2015 by PILOU

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 From:  Wlawton
7725.9 In reply to 7725.8 
Dear Frenchy, or should I call you Pilou?

First and fore most I want to thank you for your patience. This must be trivial to experts like you and Michael.

The reason that I am taking so much time and care with this, is that aligning these figures is extremely important for me to get an accurate representation of the configuration. Once I have a Moi description for the configuration an iges file is exported to a grid generation program to produce a computational fluid dynamics simulation of the configuration.

I am attaching a moi file with the three images inserted into rectangles as you suggested. The images have been clipped as close as possible and I am attaching them also. The rectangles measure 96'5" (96.41667') long by 93'6" (93.5') wide, by 25'10" (25.83333') high. I am attaching a file called g5503_view which shows the original dimensions of the 3 views.

The problem that I have is that if you draw a line from the leading edge of the engine inlet in the top view, it does not line up with the engine in the side view. This misalignment would be critical.

Is there something that I am doing wrong or is this something that you see in your own work? Any help you can provide would be greatly appreciated.

Sincerely,
Bill
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 From:  Frenchy Pilou (PILOU)
7725.10 
<< Dear Frenchy, or should I call you Pilou?

Pilou is more friendly! Frenchy is more general! ;)

When I say images is not inside your file, it's that you can save the 3 images directly with your 3Dm File!

Case: View / Properties / Embed Image Data in 3DM File
So I will can see what that you do exactly! ;) (Images, position, scale...)

Of course file will be a little more big but...

If something is not well aligned :
either original scale of one image is not at the good scale
or trim is somewhere bad
or aligment is not well realised
or...

Courage! :)

Ps I am not very fluent with imperial measures - an headache nightmare! :)
Decimal is a dream in comparaison! :D

In any case dimension are not important if you have 3 images well fited between them!
You will can resize the 3D model at the end if you need some 2D / 3D drawings for Print or...! ;)

EDITED: 18 Nov 2015 by PILOU

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 From:  Wlawton
7725.11 In reply to 7725.10 
Dear Pilou,

I have modified the properties of the images as you suggest. I am learning something new. Does this version of the file include the images?

Sincerely,
Bill
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 From:  Frenchy Pilou (PILOU)
7725.12 In reply to 7725.11 
<< Does this version of the file include the images?
Of course yes! We are in 2015! ;)

And yes there is a little problem with the side views! In height and weight ...for the reactor (?) and also for the top of the cabin!!!
So you must adapt it! Maybe original image was deformed on the 2D prog ...

EDITED: 18 Nov 2015 by PILOU

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 From:  Michael Gibson
7725.13 In reply to 7725.9 
Hi Bill,

re:
> The problem that I have is that if you draw a line from the leading edge of the engine inlet in the
> top view, it does not line up with the engine in the side view. This misalignment would be critical.

Probably the images are not accurate - if the images are just kind of quick sketches that have differences between them then there won't be any way to align them 100%.

They need to be accurate views of the same exact object if you want them to align properly.

- Michael
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 From:  Wlawton
7725.14 In reply to 7725.12 
Thank you very much for helping me understand better the process of aligning images. I agree with you that this particular 3view is nou accurate enough and I will look for a better one

Sincerely
Bill
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 From:  coi (MARCO)
7725.15 In reply to 7725.14 
Hi Bill,
is that a Gulfstream G500/G550? Otherwise I converted( to PDF via Photoline) and imported the SVG-file from this Wikipedia article https://en.wikipedia.org/wiki/Gulfstream_G550#Specifications. These are actually all unconnected curves, no tracing necessary. I grouped the curves and named them after their initial view, so front, side and top. Might be of some help, i dunno.



Best,
Marco

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 From:  Wlawton
7725.16 In reply to 7725.15 
Marco,

Thank you very much for your input. I found it very interesting. I am not sure that I no what an SVG file, or how you obtained it, but your geometry matches much better than the 3 view that I had.

Thank you again for you help and guidance.
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