// Xmin YZ plane, z axis
x = x2;
if ((z2 - z / offsetSize) < msize) {
for (double zoff = 0; zoff + z <= z2; zoff += offsetSize) {
o.addVertex(x, y1, z + zoff);
o.addVertex(x, y2, z + zoff);
}
}
// Xmax YZ plane, z axis
x = x1;
if ((z2 - z / offsetSize) < msize) {