Using if statement in analyzing/editing a txt file

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Taylor Gates
Taylor Gates on 21 Jul 2018
Commented: Taylor Gates on 21 Jul 2018
I am trying to develop a code to analyze a text file in MATLAB. The text file was an stl file for 3D printing. It repeats 7 lines about 100000 times to call out each triangle in the stl file. I am trying to develop a code using sscanf, fprintf, and if statements to cut away the bottom portion of the file for printing. I know the code will need to analyze the z values, cut them out if they are below the halfway point, and put the points back into a modified txt/stl file. How can I do this? Here's an example of the first 7 lines. I was thinking to use an if statement that if the line begins with 'vertex' it would analyze the 3rd number value in the row?
facet normal 0.278814 -0.935724 -0.216066
outer loop
vertex -0.596372 -4.060564 5.681240
vertex -0.555372 -4.055394 5.711758
vertex -0.599424 -4.075450 5.741772
endloop
endfacet
  7 Comments
Taylor Gates
Taylor Gates on 21 Jul 2018
It only pulls out the x value instead of x y and z how can I fix that

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