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Elliptical arc door hole

borgo1971
Newcomer
Every time I need it, I'm wondering Archicad hasn't a empty door hole with elliptical upper arc (or better, flattened semicircle arc).
Archicad normal arc hole, if curved part is less then half the hole width, lowers arc center and creates two edges between vertical part and the arc start. I often have arcs that haven't edges at start, but are much larger than twice the height of the curved part, with the curved part that becomes a a flattened semicircle.
Even elliptical window hole has not the geometry I need, but looks a bit better than door object.
I hope that sooner or later graphisoft will add this type of arch, both as a door object and as a window object.
since ArchiCAD 4 now 23 & 24 on
MacPro 2009 6x3.33GHz, 24GB ram, RX580 nitro+, nvme SSD, macOS 10.14.6
MBP 16"i9 8x2.3GHz, 16GB ram, AMD 5500M 4GB, nvme SSD, macOS 10.15.7
13 REPLIES 13

Lingwisyer
Virtuoso
Are you using the US library? The Arch Top Door Opening in the AUS and INT library has an adjustable curve, though it is by height rather than radius.




Ling.
AC18-23 AUS 7000
Self-taught, bend it till it breaks.
Win10 | E5620 x 2 | 24GB | K2200

borgo1971
Newcomer
I have italian library, and I think I get the same object. But I'ts not the arc I need. This (which I model cutting the hole with a form) is what I mean. No edges between arc and stills.
since ArchiCAD 4 now 23 & 24 on
MacPro 2009 6x3.33GHz, 24GB ram, RX580 nitro+, nvme SSD, macOS 10.14.6
MBP 16"i9 8x2.3GHz, 16GB ram, AMD 5500M 4GB, nvme SSD, macOS 10.15.7

Lingwisyer
Virtuoso
Ah. A 3 point arc.
AC18-23 AUS 7000
Self-taught, bend it till it breaks.
Win10 | E5620 x 2 | 24GB | K2200

Barry Kelly
Moderator
I can only speak for the AUS (INT?) library, but it seems there is not a 3 arch opening.
However there is a 3 arch window.
You can use that and turn of the 3D detail - you will have an opening.
Turn the 2D detail off and there will be no opening in plan - you will have to add a fill.

Barry.

One of the forum moderators.
Versions 6.5 to 25
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borgo1971
Newcomer
Barry wrote:
I can only speak for the AUS (INT?) library, but it seems there is not a 3 arch opening.
Same in ITA library.
However there is a 3 arch window.
In realty I'm not sure the geometry is a 3 arch... it's more a squeezed half circle. Or better, an half ellipse (https://en.wikipedia.org/wiki/Ellipse). I guess as you know, ellipse has two centres and the radius changes continuously. 3 arch has 3 centres with two or three radius (maybe left and right radius could be different). This can be combined with lowering center. There should be two parameters: center position with respect to the vertical part, and arc height (L1 and L2 in the last arc of attached example).
In any case, 3 arch hole could be acceptable in most cases.
You can use that and turn of the 3D detail - you will have an opening.
Turn the 2D detail off and there will be no opening in plan - you will have to add a fill.
OK, but this are all workarounds... I mean, it should not be too difficult for Graphisoft to create a door hole symbol for elliptical (or 3 arch) holes.
since ArchiCAD 4 now 23 & 24 on
MacPro 2009 6x3.33GHz, 24GB ram, RX580 nitro+, nvme SSD, macOS 10.14.6
MBP 16"i9 8x2.3GHz, 16GB ram, AMD 5500M 4GB, nvme SSD, macOS 10.15.7

runxel
Mentor
In the German library there is a window and an opening for that already...
It's called "Korbbogen" in German.

Technically it should be possible to extract that object from the OOTB .lcf.
Not sure, if users are allowed to share that one, tho.
AC 24 [ger] | Win 10 | Developer of the GDL plugin for Sublime Text |
«Furthermore, I consider that Carth... yearly releases must be destroyed»

borgo1971
Newcomer
runxel wrote:
In the German library there is a window and an opening for that already...
It's called "Korbbogen" in German.
I downloaded German Archicad Trial, but didn't find a door opening with 3 center or elliptical arc. There's the same 3 center window opening I have in Italian library, and there are two door objects I haven't in Italian library named "Terassentür Korbb ...", but seems it can't be used as empty opening.
since ArchiCAD 4 now 23 & 24 on
MacPro 2009 6x3.33GHz, 24GB ram, RX580 nitro+, nvme SSD, macOS 10.14.6
MBP 16"i9 8x2.3GHz, 16GB ram, AMD 5500M 4GB, nvme SSD, macOS 10.15.7

runxel
Mentor
You won't find it with the doors but the windows.
See screenshot:
AC 24 [ger] | Win 10 | Developer of the GDL plugin for Sublime Text |
«Furthermore, I consider that Carth... yearly releases must be destroyed»

borgo1971
Newcomer
runxel wrote:
You won't find it with the doors but the windows.
Yes, I know. It's in Italian library too. But it's not really elliptical. And I don't understand way Graphisoft didn't make a port hole, at last from this.
In any case, many times I need elliptical arcs... and sometimes asymmetrical 3 center arcs too.
since ArchiCAD 4 now 23 & 24 on
MacPro 2009 6x3.33GHz, 24GB ram, RX580 nitro+, nvme SSD, macOS 10.14.6
MBP 16"i9 8x2.3GHz, 16GB ram, AMD 5500M 4GB, nvme SSD, macOS 10.15.7

Lingwisyer
Virtuoso
Just curious, how would you actually build an elliptical arch?

Also, I believe the Ellipse Top Window Opening object is a three point arch given the math, so no actually and ellipse...



Ling.
AC18-23 AUS 7000
Self-taught, bend it till it breaks.
Win10 | E5620 x 2 | 24GB | K2200

mbl
Newcomer
As far as I know, it's also not possible to make an elliptical hole in a slab for example ... or basically any 3D Element of elliptical shape.

So I guess Archicad doesn't really like ellipses other than in 2D.
Archicad 15-22
Win 10

Mea navis volitans anguillis plena est.

borgo1971
Newcomer
Lingwisyer wrote:
Just curious, how would you actually build an elliptical arch?
Do you mean in construction?
Its pretty simple... you start with the two focal points at stills bundled with a taut string. Then start nearing the focal points and elevating the center of the string until you reach the desired arc height and you fix the focal points. After that you take a pencil and holding the string taut with it, you can draw the elliptical arc.
since ArchiCAD 4 now 23 & 24 on
MacPro 2009 6x3.33GHz, 24GB ram, RX580 nitro+, nvme SSD, macOS 10.14.6
MBP 16"i9 8x2.3GHz, 16GB ram, AMD 5500M 4GB, nvme SSD, macOS 10.15.7

borgo1971
Newcomer
mbl wrote:
So I guess Archicad doesn't really like ellipses other than in 2D.
In GDL you can create solid ellipse stretching a cylinder with MUL command. And there is an ELLIPS command for hemisphere ellipsoid (but this could be less suitable). But I guess the more feasible option is to calculate mathematically the coordinates of the points that approximate the elliptical arc based on the resolution parameter.
since ArchiCAD 4 now 23 & 24 on
MacPro 2009 6x3.33GHz, 24GB ram, RX580 nitro+, nvme SSD, macOS 10.14.6
MBP 16"i9 8x2.3GHz, 16GB ram, AMD 5500M 4GB, nvme SSD, macOS 10.15.7

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