how to keep precise control over a mesh?

hi, i would like to create a mesh but be able to manipulate it to a high degree parametrically.

in theory i would say that could find a way to gain control over the individual subdivisions of the mesh, however, how then would i control only specific ones?

i am hoping for a tutorial if possible since i assume this would be a pain to explain.

maybe the best way to do this would be to not generate the mesh in gh but instead link gh to an existing mesh in rhino, that way i would manipulate the rhino mesh and that would work? my only problem with this is that the mesh is originally generated from parametric elements in gh so if i change these elements the mesh in rhino will not change, therefore, making it now wrong - ie it would only work in the short term and not for exploration.

preferably everything could stay made in gh?

thanks

Ken

Replies to This Discussion

Permalink Reply by Hannes Löschke on January 1, 2013 at 6:51am

Maybe you could clarify what part of the mesh would you like to modify and how.

Why do you need it to be a mesh anyway, why not modify the original elements in GH?

Permalink Reply by Kenneth Allan on January 1, 2013 at 7:37am

i have uploaded an image that should be more clear.

i am trying to export that part of the model into another program. i want to create it in gh because it is mainly dependant on other things specifically the location of supports and the roof. so as i move a support or the roof the mesh will move automatically saving me some effort in recreating it every time after a move.

my problem is that the way i see it is that i am effectively vaulting between two curves to create a mesh since those are the only things that i am basing my mesh on. this process leaves me with a lack of control in between these two curves. i want to find a way go gain control in this area.

i hope this is more clear now?

i assume it is a really simple fix and that maybe i need to specify my mesh in a different way that give me more control over it - or maybe specify the surface as something else (brep maybe????) then convert that into a mesh? i really am clutching at straws now........

thanks

Attachments:

the mesh volume.jpg, 1.3 MB

Permalink Reply by Chris Tietjen on January 1, 2013 at 8:12am

Your description still seems a little bit esoteric. Can you show the actual geometry of what one iteration might look like rather than just the conceptual schematic?

Permalink Reply by Hannes Löschke on January 1, 2013 at 9:35am

First off, I really see no reason to use a mesh at your conceptual stage of work. Having a mesh might even complicate the way to modify the geometry. If you need to have a mesh for the final stage of exporting the geometry to whatever other software you use, you can always mesh any BRep or Surface before baking or mesh in Rhino.

The "esoteric" part that I see (and Chris probably referring to) is what kind of "control" you want to have. There is more than just one way to build a surface between your top boundary and the supports. Depending on the way you choose, you can get virtually any control over the shape you want. A sketch of the intended form and controls might help us to point you to the right direction.

Permalink Reply by Kenneth Allan on January 1, 2013 at 8:15am

i haven't gotten that far tbh - kind of hit a wall in my work. im away from working until the 7th then il try to build it and post the gh file etc on here.

thanks guys

Permalink Reply by Chris Tietjen on January 1, 2013 at 9:26am

Using scaling of mid curves derived from an initial volume based on a fixed roof and support input geometry. Just a guess to give you a direction.

Permalink Reply by Kenneth Allan on January 7, 2013 at 10:12am

ah wow thank you both for all of the hard work. Hannes - I was referring to geometric control similar to that of which Chris designed a definition for below. Chris - I am having a little difficulty in recognizing which components are what in the jpeg uploaded (i dont usually use the icons only display since I still do not know many of the components in gh yet) , I was wondering if you still had the files used to create the image below so that I can experiment with the definition a little and use that to make my own.

Thanks again guys! you have helped me out loads! I really appreciate it!

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