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

Posted: Mon Jul 01, 2013 7:52 am
by Husky
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 10731 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
(86.63 KiB) Downloaded 539 times

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

Posted: Mon Jul 01, 2013 10:29 am
by Clive
Hi Husky
Do you mean something like this ?
Dowel example.png
Dowel example.png (2.8 KiB) Viewed 10590 times

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

Posted: Mon Jul 01, 2013 7:01 pm
by Husky
YES! Nice!!! How??? :shock: I'm to dummzumzum! :lol:

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

Posted: Mon Jul 01, 2013 7:34 pm
by Clive
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
elliptical shape.png (52.36 KiB) Viewed 10564 times

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

Posted: Tue Jul 02, 2013 3:40 am
by Husky
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)

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

Posted: Fri Aug 16, 2013 8:32 pm
by Husky
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
Husky-2013.08.16-07.png (3.85 KiB) Viewed 10475 times
You have to try it by yourself! 8)

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

Posted: Tue Aug 20, 2013 4:54 pm
by Clive
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
Misc > Drawing .png (18.66 KiB) Viewed 10295 times

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

Posted: Tue Aug 27, 2013 10:42 pm
by Husky
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 10366 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)