Extracting 2D plane values from a 3D mesh

I have 3 arrays (x,y,z) of size 243,528,000 each. These array have coordinates in x,y and z respectively. I want to extract the data in the 2D plane (say yz plane values at x = 2) from the 3D mesh. These x,y,and z arrays are used to create 3D mesh. How to perform this.

Answer 1

[Walter Roberson]

If you have vectors of values, then scatteredInterpolant() or griddedInterpolant()

However in your earlier question you were dealing with a regular mesh that for whatever reason had been reshaped into vectors. If that is still the situation then you should rearrange back into a 3D shape instead of working with scattered points.

Is your grid 1825 * 2085 * 64 ?

[Abhishek Saini]

Model contain 1000*417*584 nodes in x, y and z direction respectively.

Mesh is structured. I have extracted the centroid of 8 node element and I want to extract the values in a plane.

My main objective is to find the 2D plane to implement inpolygon because it is for 2d.

[Walter Roberson]

Is there a reason that you converted from the 1000*417*584 mesh to vectors 243528000*1 ? And which vector has the value associated with the nodes ?

My main objective is to find the 2D plane to implement inpolygon because it is for 2d.

https://www.mathworks.com/matlabcentral/fileexchange/43381-intriangulation-vertices-faces-testp-heavytest

https://www.mathworks.com/matlabcentral/fileexchange/47909-pointsinpolyhedron-test-if-points-are-in-polyhedron

https://www.mathworks.com/matlabcentral/fileexchange/48041-in_polyhedron

https://www.mathworks.com/matlabcentral/fileexchange/10226-inhull

[Abhishek Saini]

I converted in to a linear vector to use it in another FE software for computaion. I want to create a semi circular notch (as a crack) by deleting elements from the mesh as shown in attached figure. So I was planning to find the plane at a particular position and then use inpolygon to find element number for deletion.Because the crack is of almost zero widht so I am afraid whether I could use the in_polyhedron funcition or not.

[Walter Roberson]

If the input is the full 243528000 and the grid is regular, then reshape and indexing will be much much faster.

Otherwise, use logical masks comparing to the x y z bounding box of the notch to select a small subset of the points, which you can then compare against the detailed polygon.