Create mesh from trimmed meshplane

Hey there, very new to grasshopper so please excuse my ignorance -

I’m trying to make a simple dome shaped gridshell. I cannot seem to create a mesh from this shape that I have created from trimming a meshplane with a circle. Any ideas? I’m sure it’s something simple that Ive missed.

Thank you! !

3.1.4 GRIDSHELL s.gh (11.8 KB)

Screenshot_1

I created sample .gh file but I think it is difficult because circle cannot keep accurate grid.
I hope you will find the document useful.

3.1.4 GRIDSHELL s20181106.gh (26.1 KB)

Does this help? Instead of trimming, culling faces. 181105_CullMeshFace_Datum.gh (7.3 KB)

That’s very close to what I’m looking for, thank you so much! I’m surprised how difficult it is to construct a mesh from those points…

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Thank you, but I need the form of the mesh to be a orthogonal grid… a sphere doesn’t work in this case :frowning: