Finding values within a 3D Array

The problem I have is that I have a 3D array with the dimension of 181x361x1931. If I was to simulate a line at any point through the 3D array, is there a way to retrieve all the data that the simulated line would penetrate through and store them within a new array.

I have seen various answers that deals with a 2D array, but haven't seen anybody answer a question regarding a 3D array. I have also seen that there are various packages on Matlab that deals with Bresenham Line Algorithm in 3D matrix, but like I said the line is imaginary thus, i don;t have much of an idea of how to go about it. I was purely wondering if there is an easier way of doing such calculations.

[Mathieu NOE]

if your line goes through existing points of your 3D array, I don't see why this would be difficult;

if your line has an arbitrary trajectory, it may simply not go through any point; what are we supposed to do in that case ? interpolation ?

[Rik]

Perhaps you need my point_to_line_distance function? Or findND? At any rate, your question is not clear enough to give an actual suggestion.

[Chunru]

If the 3D data array and line coordinates are known, the interp3 function can be used to retrieve the data.

[Tianchu Lu]

So now I used griddedInterpolant function within Matlab and it worked. than you Chunru for the suggestion

Answer 1

[Tianchu Lu]

The use of griddedInterpolant to solve the issue.

For more information check out the matlab page.