Unfold Pyramides?

Hi,

i need some help unfolding a geometric shape:

It is a kind of a pyramide with variable height and opening (see screenshot) What i need is to unfold the whole thing to be able to print the hull out.

How can i achieve this? I added the Grasshopper definition + a (hopefully) describing screenshot ;)

Any help would be just awesome!!

Thank you so much!!!

Pcace

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Permalink Reply by peter fotiadis on November 23, 2015 at 2:14am

Well ... arranging the unroll result is not that simple (but I have a complex C# that does that).

In the mean time get this attached that decomposes BrepFaces (planar) and "attempts" an unroll "as-it-is" (using the unroll method: the yellow thingy).

If you provide your Brep and the getYours == true then it works on your stuff, if not it makes a random demo Brep and then decomposes it.

If the case is simple like yours the unroll method works without the complex C# mentioned:

If however things are more "complex":

Or:

PS: The 2 Breps shown (the pyramids) are internalized - I do hope that GH did it successfully (not the case in most situations).

best, Peter

Attachments:

decompose_brepV3.gh, 140 KB

Permalink Reply by J Frölich on November 23, 2015 at 4:41am

Hi,

thank you so much! for your Help!!

I just figured, that i can unfold them manually (using a bunch of vectors and some magic) because the main object will not change the amount of faces etc.

So i did this now with the help of school math ;)

Thanks!

Permalink Reply by peter fotiadis on November 23, 2015 at 5:21am

Well ... you can always use that C# provided for simple cases or - Plan B - "assemble" manually the BrepFaces made if Omens ... are against the unroll method, he he.

PS: Unrolling "connected" pieces (for laser cutting with MINIMAL waste material) is one of the most challenging tasks in programming these days. Kinda like super-charging a pro-level packing app (already not the simplest thing imaginable).

Permalink Reply by J Frölich on November 23, 2015 at 5:26am

I see what you mean... i am right now trying to figure out how to pack all of my unfolded Shapes now... i opened an other topic for this (since it actually is an other topic ;) )

i Hope thats oK: http://www.grasshopper3d.com/forum/topics/arranging-objects

Greetings

Permalink Reply by peter fotiadis on November 23, 2015 at 5:51am

Well this is 120000% undo able without code ... but packing algorithms are not exactly trivial stuff - there's some fellas making a rather good living out of these.

I bet that is almost impossible to find free code for that kind of stuff.

Permalink Reply by J Frölich on November 23, 2015 at 6:30am

Hmm, that sounds... ...not like what i wanted to hear ;)

But Thanks anyway! I will update the other topic with that i have done up to now.. ill see what happens ;)

Thanks !

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