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

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

Postby Husky » Mon Jul 01, 2013 7:52 am

I tried to design an ellipse with QCAD Tools - but I stuck .... maybe someone has an easy solution for me 8)

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 :wink:
Left side .... a disaster :lol: I have no idea how I can make it correct looking :oops:

Husky-2013.06.30-01.png
Husky-2013.06.30-01.png (7.76 KiB) Viewed 2815 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? :shock:

Iso Ellipse.dxf
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Re: How do I create an ellipse in an Isometric Projection ..

Postby Clive » Mon Jul 01, 2013 10:29 am

Hi Husky
Do you mean something like this ?

Dowel example.png
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Re: How do I create an ellipse in an Isometric Projection ..

Postby Husky » Mon Jul 01, 2013 7:01 pm

YES! Nice!!! How??? :shock: I'm to dummzumzum! :lol:
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Re: How do I create an ellipse in an Isometric Projection ..

Postby Clive » Mon Jul 01, 2013 7:34 pm

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

Postby Husky » Tue Jul 02, 2013 3:40 am

Nice, thanks a lot! The grid was the trick :wink:


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 ... 8)
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Re: How do I create an ellipse in an Isometric Projection ..

Postby Husky » Fri Aug 16, 2013 8:32 pm

Husky wrote:Yep - that would be nice! But I'm sure - we have just to sit tight ... 8)

And here it is! :lol: :lol: :lol:

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
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You have to try it by yourself! 8)
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Re: How do I create an ellipse in an Isometric Projection ..

Postby Clive » Tue Aug 20, 2013 4:54 pm

Husky wrote:You have to try it by yourself! 8)

' Yippe kay yay' :D :D :D 8)
Yes what an excellant tool, I've been playing around with it...so very useful, especially for isometric work :wink:
Have you also noticed the extra Circle 'geometry' tools:
Main menu > Misc > Drawing...

Misc > Drawing .png
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Re: How do I create an ellipse in an Isometric Projection ..

Postby Husky » Tue Aug 27, 2013 10:42 pm

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
Husky-2013.08.27-03.png (15.49 KiB) Viewed 2450 times


Be a little creative, play in combination with this tool also with the clipboard and you can see how powerful this tool is!!! 8)
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