building extrusion on terrain with planar cap

Hi,

I wish to extrude a few buildings on an undulating terrain (seen in blue) by projecting them onto the brep surface of the terrain. The problem that I'm facing is that I am unable to 'cap' them as the uniform extrusions create non planar polylines. So my question is that;

Is there a way where I can extrude these building on the terrain while making planar cap of the buildings? Or is there a way by which i can make the footprint of the building planar on the surface of the terrain by keep the height same of all the buildings

I am attaching a snapshot of the model,(the model being too heavy) and the simple GH definition that I am working on.

Thank you,

Tania

Attachments:

massing testing 1_query.gh, 3 KB
planar caps.jpg, 87 KB

Replies to This Discussion

Permalink Reply by peter fotiadis on January 2, 2015 at 2:55am

Here you are. Notify if you want in depth explanations about why this (or that) fails - see Path to nowhere (1),(2).

best, PeterTheRat

Attachments:

massingtesting1_Rats_And_Humans.3dm, 81 KB
massingtesting1_Rats_And_Humans.gh, 33 KB

Permalink Reply by Tania Kaushal on January 2, 2015 at 3:21am

Thanks Peter for your prompt reply. Although, I was looking for a solution where I can do away with trimming the solid extruded geometry . Rather place the (projected) polylines on the terrain while still keeping it planar. But the 'solid difference' component in your definition does help me a bit.

Thanks again for your reply!

Cheers,

Tania

Permalink Reply by peter fotiadis on January 2, 2015 at 4:00am

OK, we could do anything you want and far more : we can dig in into a real solid terrain, create real-life (tapered) excavations, do this, do that ... as I said anything imaginable (but I don't use components any more: boring, so that could be a single weird "component" - not a cluster he he - that could do the work for you)

Anyway, get the trad update with some "hints" about:

(a) the planar thing that you've mentioned AND

(b) about how to control the rat kingdom "domain" (the basement on a per building basis in plain English).

best, Peter

Attachments:

massingtesting1_Rats_And_HumansV2.gh, 54 KB

Permalink Reply by peter fotiadis on January 2, 2015 at 4:42am

Speaking as an Architect here's the right way to deal with this:

1. If these are contemporary AEC things, changes are that their facades have some modular cladding (think more Buchtal than ugly plaster).

http://www.agrob-buchtal.de/en/cd/produkte/produkte_seiten_13045.ht...

2. 1 puts some "modular Z" increment puzzles (for more than obvious reasons). Additionally the excavation cost VS any ECO-benefits ... (heat exchangers in the foundation blah blah). OK that means that the footprint it's also modular., not to mention the whole composition (potentially).

3. So: use the projection ONLY for defining where a given footprint meets the terrain (see the yellow and blue things in V2) and then LOFT pairs (see PlanA, B) of profiles into 2 DISTINCT portions ("solids" so to speak): (a) the basement (or at least something where some potential partitions could being classified as "underground" spaces), (b) the classic building.

4. By doing 3 ... keep an eye on 2 as well (Don't forget the classic minor terrain "adjustments" around each building (meaning usage or "tmp" solids), access roads/pavements (ditto), potential connection of basements (parking), soil stabilization issues, bad seismic behavior on unevenly(Z) formed basements etc etc).

Permalink Reply by peter fotiadis on January 2, 2015 at 12:31pm

Here's an indicative proper way to do it using ... er ... hmm ... just one "component", he he.

PS: In real life that "component" could become extremely complex.
PS: Notice that the "profile" Z position has nothing to do with the Lofted things (as it happens in real-life).

best, Peter

Attachments: