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I've been playing Defense Grid: The Awakening, and I can't help but notice that my towers (most noticable with flame / laser so far) seem to get in the way of each other; their cone (or line) of fire stops whenever it would 'shoot' an allied tower instead.

Is this a bug? Am I going crazy?

If it's intended, are there any towers which don't behave like this (which is to say, obeying the perceived line of effects)?

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up vote 11 down vote accepted

You're not crazy. Direct-fire towers use line-of-sight (LoS) to determine if they can attack an enemy or not (and of course range).

The only towers unaffected are the true Area of Effect (AoE) towers (not inferno), and the indirectly firing Meteor tower, here is a brief summary:

Direct fire: Cannon, Gun, Inferno, Laser, Missile*, Telsa

Indirect fire: Meteor, Missile*

*Given that the Missile tower fires seeking missiles (but appears to initially target using LoS), it could be considered to be to be both

Area of Effect Damage: Concussion

Area of Effect Other: Temporal, Command

You'll usually see AoE towers on the second row (being unaffected by LoS), and Indirect fire towers more distanced from the killing zone. There are, however, some good non-AoE second row candidates:

The cannon is great on the second row because it fires high damage (but slowly), taking advantage of momentary visibility. A brief loss of LoS is also often moot, as it will usually be reloading (which it spends most of its time doing).

The laser is also good on the second row, as it continues to cause lingering heat damage for a short while after hitting the target (you'll see them glowing), meaning the LoS interruption is mitigated slightly.

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missile towers are a bit strange, sometimes mine refuse to shoot at flying units at all even though they are in range –  z - Apr 9 '11 at 13:01
    
@yx_: That is odd. Could it be a perspective thing; the camera angle makes it seem like they're in range? I would screenshot it happening if I were you, and post it as a question. –  Stuart Pegg Apr 9 '11 at 16:00
    
this is only tangentially related, but do laser towers do any damage other than the DoT? I've seen some sources claiming the only thing the laser tower does is reset the DoT duration (where all of its damage comes from). –  Raven Dreamer Apr 9 '11 at 17:15
    
@Raven Dreamer: It would explain some of the lacklustre direct damage, but I'm afraid I don't know for sure. –  Stuart Pegg Apr 9 '11 at 19:55
    
On the subject of laser damage (for anyone curious): gaming.stackexchange.com/questions/21443/… –  Stuart Pegg May 3 '11 at 11:08
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