NX About "Pitch Angle" option of the 'Hood Visibility Line' command

In 'Vehicle Design Automation' application there is command 'Hood Visibility Line'.

In 'Hood Visibility Line' dialog there is option 'Pitch Angle' and it has a value.

What is the meaning of this value?

The 'Hood Visibility Line' function uses a series of section planes to generate the hood visibility line. Pitch Angle is used to specify the section plane interval value that is used to calculate the number of section planes sampled in the range from -90 to 90 degrees.