angle changing between the lines

Hi everbody,

I have a question about how to change angle between the lines in grasshopper. My aim is to obtain a deployable hypar with constant bar length. I have defined a hyperbolic paraboloid (hypar) with 4 skew lines. As you will see in the attached file, it can be deployed by moving the upper nodes. However, this cause to change of line lengths. Rather than this, is it possible to change the angle between the adjacent lines??

I would be glad if someone can help me.

thank in advance,,

feray

hypar.gh

Attachments:

hypar.gh, 7 KB

Replies to This Discussion

Permalink Reply by Ola Jaensson on April 3, 2013 at 10:09am

This is one way to do it, but the second rotation should perhaps be adapted after the first one, to be more predictable.

/ola

Permalink Reply by Fery on April 3, 2013 at 1:40pm

Thx for ur help, I got it ;) I think u described some construction lines to generate the hypar. I am asking u this, cuz I m new to gh: Is it possible to eliminate these lines? Another question is that how to draw lines between two opposite lines by dividing them into segments as in the image below.

I have enclosed the new gh file.

Attachments:

hypar_from_Ola.gh, 9 KB
Hyperbolic-paraboloid.png, 34 KB

Permalink Reply by Ola Jaensson on April 3, 2013 at 3:45pm

Yes, my program just constructs the edge lines. Add this to the right in the definition to get the divisions.

The construction lines is how GH works; everything generated by the program stays on screen unless explicitly hidden. Select all the components, press space and klick the blindfolded head. Then rightclick and select "preview" on the components you want to see.

/Ola

Permalink Reply by Fery on April 4, 2013 at 8:21am

thx u so much ;)

Permalink Reply by Artyom Maxim on April 3, 2013 at 10:30am

Or you can create a domain using a start, end angle and number of lines:

Here's also included an additional possibility to map the angles to a specific function in graph mapper.

Attachments:

hypar_1.gh, 7 KB

Permalink Reply by Fery on April 3, 2013 at 1:23pm

unfortunately, I couldn't open the file that u sent. I think it is due to that u did it in the latest version of grasshopper. If possible, could u plz send it again, because I couldn't find some of the component in the image. Thx,,

Permalink Reply by Artyom Maxim on April 3, 2013 at 1:26pm

I think Grasshopper doesn't have the option to save in the earlier version format, so resaving won't help.

Permalink Reply by Hannes Löschke on April 3, 2013 at 1:35pm