Changes

To make it flat, just set cornersize (line 107) to something small, like 0.001 and cornersmooth (line 110) to something large, like 8000.0. Then, comment out (i.e., put two slashes in front of it, like this: // ) line 141, #define CURVATURE.

Define Curvature. Something like that Comment it out. That means adding "//" in front of it. It should look like this when you're done:  //#Define CurvatureCURVATURE