What prevents a Projectile from being seen through a window?

[PJMail]

It appears standard Plasma bolts (projectile) cannot be seen through the front windows of a Vertibird (all other projectiles can) and also have no effect.

Only the muzzle flash is visible.

Basically the player has a plasma weapon who's 'projectile' point is outside the VB while the player is inside. It works fine for Laser, 5mm bullets and missiles.

I am very surprised even the impact effect does not happen (so it causes no damage).

Anyone have a clue why/what is going on here?

[Qrsr]

It sounds like a missing flag in the NIF for the plasma projectile.