Laser Fences used to work in Red Alert 2 and Yuri’s Revenge 1.000 but stopped working with the arrival of the 1.001 patch, in that the ‘lasers’ never turned on (this appears to have been an incidental change and not something Westwood did intentionally).
Laser Fences now work just the same as they did in Tiberian Sun. You
need a BuildingType with
LaserFencePost=yes to act as a corner
post, and another BuildingType with
LaserFence=yes which will be
placed in between the corner posts automatically (see the original building’s
SHP from Tiberian Sun to see how the art is controlled). These fences
are impassable to ground objects and invulnerable to normal damage, but when a
corner post is destroyed, the fences connected to it are lost. When the corner
post loses power, the fences connected to it go offline and become freely
passable. When the post regains power, the fences reactivate and any object
unfortunate enough to be traversing them will be destroyed.
New in version 0.1.