Finding the lowest point of 4

Replies to This Discussion

Permalink Reply by Danny Boyes on October 13, 2009 at 9:27am

Hi Simon,

Take your list of 4 points and plug them into a Decompose Point component. Plug the Z value list into a Sort component (K) and then plug your original point list into the synchronous sort input of the same sort component (A) this will match the sort properties of you Z values. Your newly sorted point list will have the lowest value first (output A)

Permalink Reply by Theunis du Toit on October 13, 2009 at 11:45am

Hi Danny, did your method work on the definition? I would be very interested to see if it works that way, because I was looking for the best way to do it and the sorting would be so nice if it does. I tested it quickly and it jumbled up the end result.

I ask because I am really interested if there is an easier way than this little more complicated method I used which worked quite well though.

Attachments:

• Grasshopper.jpg, 123 KB
• 091013_Schuppentier2B.ghx, 1.4 MB

Permalink Reply by Danny Boyes on October 13, 2009 at 3:29pm

Hi Theunis,

It works, but you need an extra component before lofting. As you no longer have control over which direction the lines are to be drawn you need to make sure that they are both in the same direction before lofting. Using the flip curve component will fix this, plug one line into the C input with the other one into the guide curve and then loft the output with the original guide curve. See attached. Although this does mess up the curves to be drawn in the other section of the definition as some are aligned 90 degrees out from he other panels.

From the other thread about boolean conversion you can plug the Equals results directly into the Weave component as shown to achieve the same results:

Attachments:

• LowestZSort.png, 436 KB

Permalink Reply by taz on October 13, 2009 at 3:35pm

Simon,

I'll see if I have time to put together an example, but what you are asking to do would involve more than just finding the lowest point.

At the same time you are sorting the corner points you would also need to synchronously sort an index list corresponding to your point ordering.

Once you find the lowest point and move it then you would need to re-merge it with the original 3 points at it's corresponding index location. With some tree work I think the Srf4Pt component can be made to work.

Maybe there's a quicker way...

-taz

Permalink Reply by Danny Boyes on October 13, 2009 at 3:46pm

Hi Simon,

In case you miss the discussion with Theunis try this definition.
Best regards,
Danny

Attachments:

• 091013_Schuppentier3.ghx, 1.5 MB
• LowestZSort.png, 436 KB

Permalink Reply by Simon Vorhammer on October 13, 2009 at 4:04pm

Guys, Thanks a lot for all your answers.
I will try them out immediately tommorow morning.

Best, Simon

Permalink Reply by Theunis du Toit on October 13, 2009 at 4:50pm

Wow, I never stopped to think it the curve direction, I was convinced it was creating a listing problem when you sort it. I see it yet still my brain tells me it should be going wrong somewhere.

Thanks for the example. A much simpler approach than mine. I'll blame it on the Weave component, I just like it.

Permalink Reply by taz on October 13, 2009 at 4:19pm

I suppose this would be an alternate approach that doesn't use lofting...

Permalink Reply by Theunis du Toit on October 13, 2009 at 4:46pm

Interesting, thanks.

Permalink Reply by Danny Boyes on October 14, 2009 at 4:31am

Hi Taz,

I never realised that the sort component had a multiple input manager. Its made me think what else has!

Thanks
Danny

Permalink Reply by Simon Vorhammer on October 14, 2009 at 5:56am

In this definition the curve direction problem is solved, so its possible to create the surfaces via loft, again.

Attachments:

• 091014_Schuppentier4_a.jpg, 464 KB
• 091014_Schuppentier4_b.jpg, 207 KB
• 091013_Schuppentier4.ghx, 1.8 MB

Permalink Reply by Simon Vorhammer on October 14, 2009 at 6:22am

another thing...
Does anybody have a solution for unrolling the lofts?
I couldn´t find any solution for grasshopper geometry in the forum.
Best, Simon

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