Lists

Hello

I would appreciate if someone could point me to the right direction with list manipulation problem that I have.

This is my first Grasshopper definition, which I started yesterday, so probably it is something easy to do (?)

I try to create a surface out of a mesh (that looks like a vase). I need to create a grid of points on the mesh and interpolate them to create the surface. I need this because the parametrisation of the surface needs to be quite exact. To achieve this I extract contours in one direction and then split them with two planes. I sample points in each of the three sections using different densities.

Then, I need to create contours, in the other direction, based on the sample points.

Ideally, I would like to get all these points and create a surface out of them directly.

However, because I don't understand yet how to make a structured point grid out of the point lists, I try to just make contours in the opposite direction, which I can loft.

For the moment I cannot create all these contours all at once. I use sliders to specify a specific contour index and bake it into Rhino and then I loft them manually.

Here is the section of the GH definition that does the last contour creation:

Could you please help me in creating all the contours at one, so I can avoid exporting them one by one. In this way, I will be able to directly loft the surface with GH.

In this definition the 'Sample Contours' components are 'Divide Curve' components.

The components that write Top/Middle/Bottom Sections are 'List item' components (i=0, 1, 2 respectively), as well as those that write 'Get Rows' (i from slider).

The 'Get Rows' ones are flattened to provide a single list for interpolation.

Thanks in advance.

Stratos

Replies to This Discussion

Permalink Reply by ng5 Alex on February 6, 2015 at 8:26am

Hello Stratos

please upload your definition to take a look at. (sometimes it is difficult to recreate from screenshot)

cheers

alex

Permalink Reply by Stratos on February 6, 2015 at 9:07am

Thank you very much for having a look at this. I really appreciate it.

I attach a version of the GH definition that includes a representative sample mesh.

As a first step, I would like to get three lists of 'horizontal' contours and us them to lost a surface.

Currently, the definition can only be used to extract these contours one by one.

Ideally, I would like to make the surface directly out of the grid of points, because when lofting the parameterisation is affected/twisted. So, if this not so difficult to achieve, it would be preferable approach.

Thanks for your help.

Stratos

Attachments:

GH01.gh, 45 KB

Permalink Reply by ng5 Alex on February 6, 2015 at 10:16am

Hello

you can try the following

flip matrix is the key component to have your curves. when things with lists get tedious that when data trees (collection of lists) come in handy. you will get great benefit from studying both lists and data trees.