How to skew something (via XFORM)

[Anonymous]

Apologies to Katarina:

Her thread was sort of hijacked into a discussion of XFORM, so I have copied it into the GDL forum for further discussion of XFORM. Her original question on walls should be answered in the remaining thread in Working in ArchiCAD:

http://archicad-talk.graphisoft.com/viewtopic.php?t=26825

Sincerely,
Karl

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Hello,

I am trying to create a wall that is slanted in two different directions, see the picture, but I haven’t been able to figure out how to do. I have looked at the complex profiles tool, but I have only managed to create a wall that is slanted at the same direction in both ends, not in opposite directions.

Anyone who knows how to do?

Regards,
Katarina

[Karl Ottenstein]

Cannot think of a way to do this with walls of the top of my sleepy head.

But, you can create those shapes with GDL script ... or visually in ArchiForma (Cigraph plug-in). Just a Ruled surface (either GDL or ArchiForma) would do it...with the top and bottoms of your walls being the match lines unless the wall is to bulge too... then probably need a Coons. The result would be an object, not a wall.

Karl

[Anonymous]

Hello Karl,
I was wondering whether your "Skewer.gsm" object could be used
to twist another object with a simple rectangular cross section.
Otherwise, the only way I can think of, other than the GDL commands
you have mentioned, is to use the TUBE command with an incrementing
angle parameter in a multi-segment path to create the twist.
Peter Devlin

[Karl Ottenstein]

Peter wrote:
I was wondering whether your "Skewer.gsm" object could be used
to twist another object with a simple rectangular cross section...

Hi Peter,

I didn't think anyone noticed the Skewer thing, since CB 4 never got printed. 😉

Skewer will distort all points in an object in the same way, so it wouldn't be able to do the irregular shape shown below.

Yes, I think Tube would do it, too.

Cheers,
Karl

[Anonymous]

Hello Karl,
I have your "skewer.gsm" object but for the life of me
I can't remember where I got it from. I have Cookbook 4
as a PDF but I got that way after I got "skewer.gsm" and
the code for "skewer.gsm" is not in that PDF.
Frank Beister in this thread indicated that he had it in his
openGDL board site but I could not find it there.
http://archicad-talk.graphisoft.com/viewtopic.php?p=74058&highlight=skewer#74058
Peter Devlin

[Karl Ottenstein]

Hi Peter,

I didn't realize that David didn't distribute a zip of the contributed library parts with the CB4 PDF. I've uploaded the skewer.gsm object and the PDF pages describing it (dating from 2004) to the GDL Depository in the 01 General section:
http://archicad-talk.graphisoft.com/object_depository.php?

Thanks!
Karl

[Anonymous]

Hello Karl,
I am glad you did that because I think it is a useful object.
I have not used it myself because I have your XFORM object
that taught me how to use the XFORM command in GDL scripts
and I have used it several times in my scripts.
So, I thank you,
Peter Devlin

[Karl Ottenstein]

Thanks, Peter. Glad it was helpful. 😉

To you and the 5 other people who downloaded between when I posted and now... please download again, as I accidentally posted the first draft rather than the final March 2004 version of the PDF and the object. (The Feb 2004 version did not assign unique ID's to each hotspot.)

Thanks and best regards,
Karl

[Karl Ottenstein]

Again, thanks, Peter for your posts, as it turns out that David omitted my pages from the Cookbook 4 for some reason. The CB4 can be downloaded from here:
http://www.archicad.ca/?p=84#more-84

(Thanks to Dwight for pointing that out in another thread.)

Both PDF and the object are uploaded to the depository here under 01 General: http://archicad-talk.graphisoft.com/object_depository.php?

Cheers,
Karl

[Anonymous]

Hello Karl,
Thank you for uploading the object and the PDF.
I had skewer.gsm but never had the .PDF tutorial.
I had stated in one of my posts in this thread that
I had your XFORM object and that it taught me
how to use the XFORM command. I now discover
that I no longer have your XFORM object in my hard drive.
I must have lost it when my previous computer fried it's hard drive.

Is there any way I can obtain your XFORM object since it not
only explained how XFORM worked but it demonstrated how
it worked on a PRISM_ command. I found these demonstrations
very useful.
Thanks,
Peter Devlin