## How do I create an ellipse in an Isometric Projection ...

Moderator: andrew

### How do I create an ellipse in an Isometric Projection ...

I tried to design an ellipse with QCAD Tools - but I stuck .... maybe someone has an easy solution for me

Case: Imagine a model wall build with round dowels - like a Blockhouse,
Now I have to cut the top round dowels under 30° to get a gable shape,
In an isometric this cut has to appear like an ellipse on both sides,
Right side was easy to do with QCAD - maybe not absolutely correct but good enough
Left side .... a disaster I have no idea how I can make it correct looking

Husky-2013.06.30-01.png (7.76 KiB) Viewed 2329 times

A square dowel shape is used as the construction base in the isometric.

I know how to design a correct ellipse step by step - that is not what I'm looking for! I'm looking for a fast and "just good enough looking" solution in QCAD!
Any Ideas?

Iso Ellipse.dxf

Husky
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Location: USA

### Re: How do I create an ellipse in an Isometric Projection ..

Hi Husky
Do you mean something like this ?

Dowel example.png (2.8 KiB) Viewed 2318 times

Clive
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Location: UK

### Re: How do I create an ellipse in an Isometric Projection ..

YES! Nice!!! How??? I'm to dummzumzum!

Husky
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Joined: Wed May 11, 2011 9:25 am
Location: USA

### Re: How do I create an ellipse in an Isometric Projection ..

Well, ideally we need some additional options in the ellipse tools to produce something like this easily!

So... for me I didn't use the ellipse tool, I instead used the Spline (control points - sp) tool, which to be honest with an 'oblique' rectangle as you have here, is a lot easier to achieve something that resembles an elliptical shape.

This is how I done it - it's not straight forward but it does get the job done for now.
1.First make a grid.
2.Use the Spline tool (control points) and fit to the grid intersections.
3.Copy and paste the rest where you need them.

elliptical shape.png (52.36 KiB) Viewed 2292 times

Clive
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Location: UK

### Re: How do I create an ellipse in an Isometric Projection ..

Nice, thanks a lot! The grid was the trick

clive wrote:Well, ideally we need some additional options in the ellipse tools to produce something like this easily!

Yep - that would be nice! But I'm sure - we have just to sit tight ...

Husky
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Posts: 646
Joined: Wed May 11, 2011 9:25 am
Location: USA

### Re: How do I create an ellipse in an Isometric Projection ..

Husky wrote:Yep - that would be nice! But I'm sure - we have just to sit tight ...

And here it is!

The new QCAD update - 3.2.1 - has a new tool what solves problems like this with just a few mouse-clicks. Perfect!!!

The new tool is called:
"Ellipse: Inscribed in quadrilateral (tangential to four lines) (EQ)"

Husky-2013.08.16-07.png (3.85 KiB) Viewed 2073 times

You have to try it by yourself!

Husky
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Posts: 646
Joined: Wed May 11, 2011 9:25 am
Location: USA

### Re: How do I create an ellipse in an Isometric Projection ..

Husky wrote:You have to try it by yourself!

' Yippe kay yay'
Yes what an excellant tool, I've been playing around with it...so very useful, especially for isometric work
Have you also noticed the extra Circle 'geometry' tools:
Main menu > Misc > Drawing...

Misc > Drawing .png (18.66 KiB) Viewed 2023 times

Clive
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Posts: 905
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Location: UK

### Re: How do I create an ellipse in an Isometric Projection ..

clive wrote:Have you also noticed the extra Circle 'geometry' tools:

Yes I have - but the absolute winner for me is:
Modification tools: Clip selection to rectangular area.

Husky-2013.08.27-03.png (15.49 KiB) Viewed 1964 times

Be a little creative, play in combination with this tool also with the clipboard and you can see how powerful this tool is!!!

Husky
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Posts: 646
Joined: Wed May 11, 2011 9:25 am
Location: USA