Create a surface bettwen two elipses (X,Y)

[Cristiano Alves]

Hello, I drew an ellipse on the Z plane and another one on the Y plane.
Final Objective: draw half a solid like an egg.

Z plane:

 

X plane


 

How do I cut the bottom part of my sketch to keep only the upper part along the line that looks like a triangle?

Then, how can I create a surface that connects the ellipse in Z with the 'half ellipse in X'?

I tried NURBS and LOFT surfaces but without success.

Edited December 7, 2023 by Cristiano Alves

[Cristiano Alves]

[Update]

I have some progress.

1- I use this ellipse:


2- Convert them to line


3- Delete some segments


4- At this time I try join the lines of the curve. Didn't work.
4.2- I used the NURBS Curve tool to draw a curve line with the points of the "old curve line"
5- On this view I use "Revolve with Rail"


The result is great:

 

 

The revolve was only applied to the blue line, I wanted to apply it to the Blue+Green line (see previous image).

However, I cannot bring these two lines together in any way.

I tried Join, but it didn't work, I tried Compose, but it didn't work either.
(I did this in Front view.)

The problem shouldn't be that the lines have coincident points, since I tried joining two lines outside of this example without success.

What is the tool to join two lines?
Can anyone help me?

And last one, this is a better and correct way to do this?







 

Edited December 8, 2023 by Cristiano Alves

[zoomer]

9 hours ago, Cristiano Alves said:

What is the tool to join two lines?

 

 

I think it is not a Tool but a Command.

"Compose" from the menu.

 

9 hours ago, Cristiano Alves said:

5- On this view I use "Revolve with Rail"

 

Also thought about Revolve.

But did not answer as I was not sure if it would work

a) that way in general and

b) with ellipses

 

 

I thought about starting with circles and arcs or just by a globe

and using 3D Manipulation Tools.

Which in effect would just do a nonuniform scaling .... which may

look pretty similar - but not the same as elliptical.

And so far i assumed true Ellipses are mandatory.

[Jesse Cogswell]

I was able to get it to work.  I'll share my process.

 

Draw top ellipse in Top/Plan view

 

Off to the side, draw profile ellipse in Top/Plan view

 

Draw angled cutting line

 

Draw axis line

 

Using the 2D Polygon tool in "Paint Bucket" mode, click on the quadrant to create our true profile

 

Decompose the created polyline

 

Select the resulting polylines along the outside edge and the cutting line and Compose

 

Select the new polyline and the axis line and Convert to NURBS and Ungroup, you should have two NURBS curves

 

Use Rotate 3D to get your NURBS curves into the proper plane

 

Recenter your NURBS curves onto your rail ellipse

 

Convert your rail ellipse into a NURBS curve.  You should now have three NURBS curves

 

Revolve with Rail, selecting the axis curve, the profile curve, and the rail curve.  Then Ungroup and Add Solids to get your final shape

 

I hope this answers your question.  The key is getting to a point where you can get the profile curve and the cutting line to be able to be composed together before converting to a NURBS curve.

[VIRTUALENVIRONS]

I would probably have gone at this a different way.  Perhaps this method lacks the accuracy of revolve with rail, but it is quick.