Phasma - Developable surfaces definition

Hi Grasshoppers!

Here is the companion you missed...

Why don't you go playing together?

See this discussion too. I think it would be possible to use kangaroo rather than galapagos with this method.

Please post works and comments.

Fred.

Attachments:

Phasma 0.9.9b.zip, 959 KB

Replies to This Discussion

Permalink Reply by synergy on May 14, 2011 at 9:19am

Honestly, i don´t even know how to start using it...

Permalink Reply by Yoann Mescam (Systemiq) on May 14, 2011 at 9:22am

Which kangaroo are you using for the duplicate lines component ? Phasma doesnt seem to want to load this component with kangaroo 005 installed.

Permalink Reply by Fred Becquelin on May 14, 2011 at 11:04am

Systemiq,

My bad! It comes from Karamba. You can change it in the first cluster, it's very close to the end before the loft component. Or download karamba.

synergy,

Rhino curves = input your curves

Modified curves = galapagos modified curves

plug the one you want into the curve list component

Sampling = the number of division

Reverse curve list and Multi planks mode sometimes help to get better results.

Multi planks mode Normal = curve 0 to curve 1, 1 to 2, 2 to 3, 3 to 4 etc

Multi planks mode Jump = curve 1 to curve 0, 1 to 2, 3 to 2, 3 to 4 etc

Kill cusps = remove generatrices that cross previous ones. It's cheating.

Lowest Admissible Min Radius = only controls the gradient. About 2m for 15mm plywood.

Ther will be more explanation in a next release.

Fred.

Permalink Reply by Yoann Mescam (Systemiq) on May 14, 2011 at 11:19am

Merci, du coup je vais jeter un oeil sur Karamba que je ne connaissais pas et qui pourrait s'avérer utile.

Permalink Reply by Yoann Mescam (Systemiq) on May 14, 2011 at 5:26pm

It looks like I cant make Karamba run under rhino5, and I have some bugs on my rhino 4 version, so I changed it as you suggested so it can work with Kangaroo.

Notice: using the Galapagos optimization can be frustrating as it needs a loooot of time, first time users should probably set the population very low (about 5), to be sure it is running ok, then set it back to 50, start and go do something else.

Also, if you dont connect the two components with the red dots between them, launching galapagos may crash rhino.

synergy: this defintion should automagically work with your file

Attachments:

Phasma 0.9.8b(Kang).zip, 338 KB

Permalink Reply by synergy on May 14, 2011 at 11:24am

OK, i input the rhino curves, but i don´t know how to use the galapagos modified curves...sorry.

I would appreciate A LOT (need to test a curved developable roof) some noobs tutorial (please) or something.

Permalink Reply by Fred Becquelin on May 14, 2011 at 11:44am

first, did you take care of the remove duplicate lines error (see above)?

Rhino curves = input your curves

Modified curves = galapagos modified curves

plug the one you want (i.e. modified curves) into the curve list component

Plug an ARN cluster for each curve you input into the big merge component on the left and link the sliders to galapagos.

then launch the solver.

Use low sampling, 10 or 15 depending on the curves. 25 max.

did you open the 3dm file? it should be all rigged.

Permalink Reply by synergy on May 14, 2011 at 12:50pm

Uff, i feel like an idiot.

Can i watch a similar procedure before i attempt this? I feel lost, and if this is similar to this method (http://eat-a-bug.blogspot.com/2010/10/developable-surface-optimization.html) i think is THE solution for my roof.

I don´t want to forced you to help me, i just wanna learn the basics to test your work.

Of course, thanks a lot.

Permalink Reply by synergy on May 14, 2011 at 2:01pm

Maybe with a easy example:

How can i get a developable lofted surface from the attached curves using your method?

Attachments:

loft developable.3dm, 45 KB

Permalink Reply by Fred Becquelin on May 16, 2011 at 11:53am

Hi!

Did you make any progress?

Here is a video of how you can do it.

Hope it'll help

Fred.

Permalink Reply by synergy on May 16, 2011 at 3:31pm

Thank you very much for your effort Fred.

My roof material is a sheet of steel (3mm COR-TEN). Do you think is possible with such a gaussian curvature (2,34)? Is possible to reduce it to zero?

*I´ve got this error:

Permalink Reply by Fred Becquelin on May 16, 2011 at 4:49pm

Don't worry about this error, it's a feature that doesn't work yet.

it's 2.34e-10 (0.0000000002.34), see the GC display factor.

As you can see in the end of the video, the surface unrolls properly (0.06% bigger). I stopped the solver after the first generation too.

If you feel there are still hard points then you should probably modify control points again. As I said, you need fair and look-alike curves to get a fair dev surf. That's why I rebuilt the in the begining.