Walkway visibility dependent on camera angle

Description

The visibility of a walkway at the beginning of the game is dependent on the camera angle, making it look as if it is vanishing and reappearing.

Version

0.005

Steps to reproduce

1. Leave the starting room and enter the roofed area where you see the first switch in the game.
   
2. Point the camera at the bridge leading to the walkway leading to the castle (barrels and red flags in plain view in front of the player).
   
3. Without moving the player, move the camera up and down.
   
4. Expect no architectural changes.
   
5. Observe that the first portion of the walkway disappears and reappears depending on the camera location.
   

Thanks for the nice bug! This should be fixed in 0.006.