geometry from surfaces

hello everyone,

how to create a closed geometry from surafces?

In this case I want to crate a kind of cube (but not straight) or a box from 6 surfaces.

At least I need to calculate the volume form this geometry.

When I do this by using the join-Brep-tool I get an unusfull result like: 2.8798e+7

But anyway.At first I'm higly interessted in understanding on how to get a closed geometry from touching surfaces.

Thank you for your help.

Replies to This Discussion

Permalink Reply by nikos tzar on September 4, 2014 at 9:02am

hello Johannes,

I think it would be better if you posted your file so people can examine it and help you.

In the following simple example [joinbrep] works just fine in recreating a box from its faces so you should investigate the differences from your file (maybe your surfaces have gaps between them, or maybe they are trimmed surfaces and this somehow creates a problem, i don't know...)

cheers,

nikos

Permalink Reply by Johannes on September 13, 2014 at 7:00pm

Hello Nikos,

sorry for my late reply.

Please find my file below.

I found out the meaning of the unusefull numbers and that my definition works well.

The e+7 from 0. 1.0539e+7 shows the missing numbers behind the point which can not be shown because of the length.

That was all i needed to know.

So I found a way to get a suitable result by deviding it.

Thank You.

Attachments:

create_box_from_surfaces.gh, 5 KB

Permalink Reply by nikos tzar on September 14, 2014 at 6:02am

I didn't know that either, thanks for getting back.

nikos

Permalink Reply by Pieter Segeren on September 14, 2014 at 1:35pm

Hi Johannes, hi Nikos,

I think Roundtrip is useful here:

Format("{0:R}", x)

two search results:
http://www.grasshopper3d.com/forum/topics/equality-in-function-does...
http://www.grasshopper3d.com/forum/topics/create-set-not-working

Permalink Reply by nikos tzar on September 14, 2014 at 2:27pm

Hi Pieter,

thank you for the links.

What I still don't understand is when does grasshopper display the "e+7". It rounds up any floating point number but doesn't always display this... for example:

is this a setting somewhere or is it based on something else?

Permalink Reply by Pieter Segeren on September 14, 2014 at 3:03pm

I think default is rounding at 6 decimals for GH,
maybe the settings in File > Preferences > Display will adjust that. I didn't check that.
I don't know what the general rule for displaying is, and where/when/who it deviates from it...

Permalink Reply by Thomas on September 14, 2014 at 5:37pm

Hi!

As Pieter already mentioned you can specify the representation of floating point numbers in the preferences.

The scientific notation is used when a number is smaller than 10^(E-Lower) or greater than 10^(E-Upper).

If "Special Case Integers" is selected then floats near to natural numbers (deviation < 1e-12) are represented without scientific notation. Also floats greater than 1e15 are displayed without exponent because they can't represent decimal places and are therefore handled like naturals.

RSS