O.K., a question was placed on another thread, if there is a program that could make 3D model of fuselage if side and top views are available.
There is no such program, but using some commands it can be done in Rhinoceros3D program.
Of course, there is many ways to make 3D model using different approaches and sets of commands, but here is a presentation that starts with fuselage contours, following by cross sections and surface loft.
I will show how it is possible to get 3D fuselage using just 4 to 6 lines...(4 enough for eliptic cross sections like sailplanes, more lines for more "boxy" cross sections)
- upper fuselage contour
- lower fuselage contour
- side fuselage contour
Of course, we are not able to have full controll over the cross sections as program do that by its best way, and that doesnt suits us well everytime.
But this writting is only for presentation what commynds are used to go trough that steps. One can always use surface modifying tools to fine tune shape here and there later.
So lets go drawing a fuselage!
I will use a jpg drawing, a hand shetch of a vintage racer looking sport aeroplane, as an base for my 3d modelling.
Now I will place this shetch into Rhino as an background image.
browse to and pick that image stored in my computer
pick first corner and second corner, where you want this image to appear on your Rhino drawing space (I use Right view).
Now you use bolean curve tool and draw a line that represent upper contour of the fuselage. Dont make any sharp cornerns! make smooth transitions! Look how I go with line over a canopy area!
Note the curve avoiding coners at cockpit area!
Now I draw also the bottom line (the belly curve of the fuselage)
And we made also two aditional lines that will represent location of the widest fuselage line in top view.
This will make our fuselage more beffier.
Note all lines done. Of course, I draw them just roughly following the background shetch, but they can be made excatly as you want, up to your actual aeroplane measurements. As lines aee bolean cuves, we can still change or modify them to get closer to what we want. Just pick the "handle" point of a line and move to desired location. As you can see, I made lines at rear end of fuselage longer than needed.
Now we move to the top layout of the fuselage to make line that will repesent side contour of the fuselage.
As we did on side view, we just draw an bolean line over a side contour of the fuselage.
Note the red line in top view. It is made to get a straight line for a fuselage centerline in top view.
Note the green lines that are just a guidelines in order not to missalign sideview and top view lines.
A yellow line is the side contour of our fuselage.
We must rotate side contour that we just make for 90 deg.
Now we can see in perspective view that side curve is rotated and became also visible in top view.
But now we must place that top side contour to match both lines on the side view that were previously drawn between upper and lower contour as a line where fuselage side line will be placed.
It is an simple mater!
Let mirror side contour first, to get two! (we need two of them..we can also use copy comand)
See mirrored line over a red centerline. See top view and perspective view.
Now we will use simple Rhino command to "married" two lines and get one at the place we want!
We will use "intersecting curve projections".
Just pick one of the side curves and one of the lines at side view and click this button:
and new line is created!
Lets do that with another pair of lines!
Of course you will notice that lines (yellow) are somehow odd... one on left side, and another on right side.
We just pick both and mirror them around fuselage ceterline on the top view window.
Lets mirror them and hide or erase all other unwanted lines!
I make lines in color, so you can see on different views where each line is placed.
I remove all other lines that helps me het up to here.
Now we need just thoese 6 lines.
We will use another interesting Rhino command to get fuselage cross sections that will goest exactly between the lines that we already prepared.
Now we must pick contour lines in proper order. I pick as follows:
bottom contour, bottom left, upper left, upper contour, right upper, right lower.
If we mix order, the fuselage cross section will be crooked...like 8 number or worse!
Now we pick the locations of cross sections. Do wherewer suits you.
Showing the cross section locations.
Note the different desnity of cross section locations. More dense where we dont want porogram to go his own way. See more dense at cockpit area.
And let see these cross sections that were just automatically created in all views:
Note: yellow cross sections! That wee need!
Now erase or hide all lines except these cros sections!
WE will now use these cross sections to create a surface over them!
We will show all sections and choose command Loft. (menu Surface, command: Loft)
If we want surface, that goes excatly over our cross sections, we will choose option "Tight", we can also use option "Straight sections" (maybe when we shape metal plane), or left Rhino to smooth surface ("Loose") avoiiding sudden bumps and voids..
I choose "Tight" in this case.
As we confirm our choice a surface is created:
Now we go to the details!
We will cut oppening in the cockpit area.
We just make a plilyne that will goes trough a opening line in a side view:
Now we use split command and split fuselage surface at line we just made.
We can erase surface part that we dont need or use it as a canopy glass if the shape is O.K.
Here is not the case, so I will erase that part.
Now I will make a windshield.
I will draw a windshield rear frame and after that create a surface between frame and front cockpit edge.
We need two rails and two coss sections to make a canopy surface.
Rails are upper canopy contour, left canopy openning edgem, and cross sections are rear cockpit edge (turtledeck edge) and forward canopy opening edge.
We will use command Surface, Sweep 2 rails. And surface is created.
This is only one half of surface we need. We can mirror it now ar later.
Now wee draw a line that will represent rear frame of the windshield. Then we will split surface at that line.
Then we will erase unnecessarry part of surface..the rear part as wee need just windshield in my case.
Now look what we have!
Now only minor work is needed to complete that fuselage. For instance trimming front end for a spinner, closing rear end, making surface offset toward inside (if we want to presentate fuselage sandwich thickness), make some bulkheads and fuselage formers, arange cockpit internals as seat and instrumental panel, headrest, cockpit edges leather padding, wing root attachments, vertical and horizontal tail, landing gear and of course the wing.
And final work should look something like this: