How can I get a list as output in C#?

Grasshopper Developer
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1

New user of Grasshopper 3D here,
and my problem is that I created a component that generates some Points, this component run 26 times (for example) because I gave him 26 inputs. The thing is I want a list of this 26 ouputs instead of the 26 points because I want to use them all together to iterate through the list for the next component that I’m coding.

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2

Declare that input as List.

Anyway ALWAYS post something since problem solving via an Image is not yet invented.

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3

I changed the input and I’m still getting an invalid cast
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This is the Generate Matrix component

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The Ray | Surface - uv floor output is a Point2d

4

Maybe I was not clear enough: POST the C# (in a test gh file) that refuse to do things. Plus a CLEAR description about what you are after.

5

It looks like the problem is not with the output of the previous component, but the input of your ‘Generate Matrix’ component.
In RegisterInputParams you need to use GH_ParamAccess.list for the param, and in SolveInstance use GetDataList instead of GetData.

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6

Thank you Daniel,
but now I get invalid cast Point>>Point2d

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7

I’m sorry I don’t think this is the exact thing you want but I don’t know how to upload this in a gh file so I upload the full C# code.
GhGenerarMatriz.cs (2.8 KB)

Full Description: I want to generate a Matrix via 2 inputs, these inputs are a list of uv Points and a surface (plane surface). I need the surface to calculate the rows and columns of the matrix.
With this I want to go though the list to fill the matrix, if there is an uv point {1,1} I want to add +1 to the position [1,1] of the matrix, if there is a {1,2} it will add +1 to the [1,2] position etc.
This component will call a Method called GenerarMatriz(Points2d, surface) that does this work.

So after this description my problem is that the component Ray | Surface (intersect a ray with a surface) calculates this uv intersection points and I need these points to generate the matrix but when I try to input them I get the invalid cast.

I did this How can I get a list as output in C#? - #5 by DanielPiker but now i get Point>>Point2d invalid cast.

8

Ah, I hadn’t noticed you’re using Point2d.
Probably the easiest way here is to use AddPointParameter instead of Generic, (and GetDataList<Point3d>), then you get a list of Point3d (and can just ignore the Z part in the bits you do next).

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9

Yes! worked with Point3d.
Thank you Daniel!

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10

Given the opportunity:

  1. If you want some sort of “visual map” of a Tree to a Matrix … see comments in the attached.

  2. Ray3d DOES not work on BrepFaces … thus see Method used .

Matrix_MapCcxPtsTree_To_Matrix_V1.gh (157.9 KB)

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