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Author Topic: Auto-construct roof geometry  (Read 4803 times)
nikoola
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« on: May 02, 2009, 11:04:38 PM »

It´s exelent feature from ArchiCad I like to see in Cycas.
Here is some tehnical documents I found about this:
http://www.vterrain.org/Culture/BldCity/Roof/
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diogo.urb
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« Reply #1 on: May 05, 2009, 12:38:39 AM »

That will certainly be a very good feature to implement on cycas
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steve
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« Reply #2 on: May 05, 2009, 07:27:33 AM »

i don´t know. i think it´s a good exercise to build the roof manually. then you know for sure if it can work or not. with automatic processes maybe we will become lazy!
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dlang
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« Reply #3 on: May 05, 2009, 10:24:28 AM »

anything that can let us be lazy about getting the structure into the computer and instead concentrate on the important part (tweaking it to be _exactly_ what we want) is a very good thing.
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steve
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« Reply #4 on: May 10, 2009, 11:35:46 PM »

you may be right, but there are a lot of features i would like to see in cycas before an automatic roof tool
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dlang
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« Reply #5 on: May 15, 2009, 09:00:38 AM »

no disagreement from me (with the highest thing on my list being the broken export problem)
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steve
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« Reply #6 on: May 15, 2009, 09:56:18 AM »

remind me about that...
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dlang
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« Reply #7 on: May 15, 2009, 08:14:02 PM »

when exporting to any triangulated format (confirmed with 3ds and dxf, suspected with gts), openings in walls are frequently covered (partially or completely)
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steve
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« Reply #8 on: May 15, 2009, 09:12:02 PM »

i think we´ve hijacked this thread, oh well...

yeah i remember now. it seems like this is not a problem unique to cycas. i often import 3ds or dxf into sketchup which has a smart option on its importer: merge coplanar faces. this eliminates the problem on import.
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dlang
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« Reply #9 on: May 16, 2009, 02:00:59 AM »

unfortunantly that software isn´t available for linux
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nikoola
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« Reply #10 on: May 16, 2009, 02:14:45 PM »

Here is open source library you can use (not only for this):

http://www.cgal.org/

Here is Straight skeleton part:

http://www.cgal.org/Manual/3.2/doc_html/...apter_main.html
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Blackhawke
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« Reply #11 on: November 01, 2009, 10:09:15 PM »

Have to agree with Steve here -- there are a lot of things on my list that I would like to see in Cycas before an automated roof geometry function.

For one thing, Chief Architect has had such a function for a very long time and Chief  users have a famous saying about it: "It´s guaranteed to be right between 0% and 100% of the time." In other words: For simple roofs it works flawlessly; for complex geometries, it´s totally worthless. Most experienced Chief users don´t even let Chief try to figure out the roof geometry. They do their roofs by hand because, in the end, it´s faster and more accurate.
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steve
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« Reply #12 on: November 02, 2009, 02:26:37 AM »

excellent point, blackhawke!

even the slightest out-of-the-ordinary feature and those auto roof procedures fail. and some apps even lack the basic machinery to build a roof by hand at all!!
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Blackhawke
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« Reply #13 on: November 06, 2009, 07:15:13 PM »

Tell you one thing that WOULD be handy for doing roof planes is the ability to set the pitch so that you could just put the different roof planes together and not have to "raise" them from flat rectangles. Having to "raise the roof" (pun intended) is in and of itself a pain in the a$$ when working with complex geometries.

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