Function rayIntersectNormalLine

Normal at ray intersection with a line

rayIntersectNormalLine(start, end, p, v): Vec2
Parameters
- start: Vec2
  start point of the line
- end: Vec2
  end point of the line
- p: Vec2
  A point
- v: Vec2
  A vector
Returns Vec2
The unit normal at the intersection point
- Defined in bloom/src/core/computation.ts:1994