Returns the distance in pixels from the mouse pointer to a 3D section of a disc.
Calculates the screen space distance from the mouse pointer to the disc section at given world
space position with the given radius and normal. The disc section is defined by
from vector and the angle in degrees.
現在のカメラが距離を決定するのに使います。
Additional resources: DistanceToDisc, DistanceToCircle.