proc length(self: RayShape): float64 {.
gcsafe, locks: 0, raises: [], tags: []
.}

proc length=(self: RayShape; val: float64) {.
gcsafe, locks: 0, raises: [], tags: []
.}

proc slipsOnSlope(self: RayShape): bool {.
gcsafe, locks: 0, raises: [], tags: []
.}

proc slipsOnSlope=(self: RayShape; val: bool) {.
gcsafe, locks: 0, raises: [], tags: []
.}