Destroying Terrain

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Revision as of 21:41, 11 May 2006 by Ethereal Cereal (talk | contribs) (typos notwithstanding)
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Most terrain features found on the battlescape can, with sufficient firepower, be destroyed. UFO outer hulls can be breached with a Blaster Bomb, inner UFO hulls can sometimes be breached by a Heavy Plasma, and weaker structures can be destroyed by more conventional weaponry, such as Grenades or even sometimes Rifles.

Damage vs. terrain

The general rule is that explosions will do a fixed 50% of their rated damage to a terrain feature, and projectile/beam weapons will do between 25% and 75% of their rated damage. The 50% damage for explosions is at the center of the explosion; damage will decrease by a constant amount the further away from the center you go.

If the damage dealt exceeds the terrain's damage rating (or "armor"), the terrain will be breached or even destroyed. If the damage is less than the terrain's damage rating, the terrain will be completely unharmed. See Explosions#Tile Characteristics for a table detailing several terrain types and their damage ratings.

UFO walls

The outer hull of a UFO has a damage rating of 100 points: as a result of this, only Blaster Bombs (Damage = 200) can breach them. Inner hulls and doors have a damage rating of 80 points. Heavy Plasmas, with a base damage of 115, can do between 28.75 and 86.25 points of damage to terrain. 6.25 values out of a range of 57.5 possible values (6.25 / 57.5) is 0.1087, which would mean Heavy Plasma shots will breach inner UFO walls 10.87% of the time (provided the random distribution of damage values is uniform -- this has not yet been tested). Three Heavy Plasma shots have a 29% chance of breaching a UFO wall, and even a full clip (35 shots) has a 1.78% chance of failing to break through.

Tank/Laser Cannon and Hovertank/Plasma both have a base damage of 110, which translates to a range of 27.5 to 82.5 against terrain objects. (2.5 / 55) is 0.0455, so these tanks should be able to breach inner UFO walls 4.55% of the time.

The Hovertank/Launcher's fusion ball munition has an explosive damage of 140. 50% of 140 is 70, which means a Launcher tank can never breach inner UFO walls.

Certain inner UFO walls and doors are more durable than the average inner wall. These so-called "security walls" have a damage rating of 100, like UFO outer walls, and can only be breached with the use of a Blaster Bomb. Security walls have a smooth, unsegmented appearance, with several bands running along the top. Security doors are darker than normal UFO doors and do not have a line running down their centers. The upper level of Battleships are constructed solely with security walls, although security doors are only used to enclose the central lift. See image below.


Terrain structures

These figures were researched using the MCDEdit program.

UFO structures

Terrain Object Damage Rating
Outer Wall/Door 100
Inner Wall/Door 80
Security Wall/Door 100
UFO Power Source 50
Elerium-115* 20
Blue Chair 60
Navigation Console (wall) 40
Navigation Table (octagonal) 15
Round Fuel Pod 20
Oblong Fuel Pod 30
Flashing Wall (Alien Entertainment?) 60

* Do not use explosive munitions near a UFO Power Source if you wish to collect the Elerium contained within it.

Alien base structures

Terrain Object Damage Rating
Dirt Wall (surface) 100
Dirt Wall (interior) 100
Metal Wall 80
Windowed Wall 100
Display Cases 10
4-space Vats 60
Other 1-space Vats 30
Command Center Table (octagonal) 15
Alien Plants 5-40*

* Green ones are 5-14, more colorful ones 20-40 depending on size

X-COM base structures

Terrain Object Damage Rating
Wall 80
Dirt Wall (interior) 60
Door 50
Hangar/Access Lift Door 75
Fuel Drum 12
Missile 20

Farm structures

Terrain Object Damage Rating
Wooden Wall 12
Door 12
Brick Wall 25
Stairway(lower) 16
Stairway(upper) 20
Wheat 6
Flowers 8
Vegetables 10
Apple Tree 16
Normal Tree 22
Damaged Tree 15
Stone Wall 25
Hedge 12
Fence 11

Forest structures

Terrain Object Damage Rating
Trees/Logs (various) 13-18
Large Tree (trunk) 24
Large Tree (branches) 18
Bushes 12
Hill 30

Urban structures

Terrain Object Damage Rating
Grey Brick Wall 25
White Wood Wall 14
White/Blue Doors 12
Yellow Walls (not used?) 25
Beige Warehouse Wall 30
Crates 20
Stairway 25
Green Door 30
Smooth Grey Wall 30
Glass Door 15
Misc. Retail Objects 5-16
Misc. Furniture 4-22
White Picket Fence 8
Grey Metal Fence 20
Brown Wood Wall 11
Hedge 8
Fruit Tree 20
Flowers (incl. Planter) 8
Pillar 35
Fuel Pump 18
Light Post 20
Garbage Can 15
Red Post Box 14
Hydrant 30
Phone Booth 25

Weapon damage ranges

Projectile/energy weapons

These are the damage ranges of these weapons vs. terrain objects (0.25 to 0.75 their normal rated damage). Their damage range vs. living creatures is between zero and twice rated damage.

Pistol 6.5 - 19.5
Rifle 7.5 - 22.5
Autocannon-AP 10.5 - 31.5
Laser Pistol 11.5 - 34.5
Plasma Pistol 13 - 39
Heavy Cannon-AP 14 - 42
Laser Rifle 15 - 45
Plasma Rifle 20 - 60
Heavy Laser 21.25 - 63.75
HWP Laser or Plasma 27.5 - 82.5
Heavy Plasma 28.75 - 86.25

Explosive weapons

Damage listed is for center of explosion, decreasing with distance. Damage range vs. living creatures is between one to three times these values.

Autocannon-HE 22
Grenade 25
Heavy Cannon-HE 26
Proximity Grenade 35
Small Rocket 37.5
Alien Grenade 45
Large Rocket 50
High Explosive 55
HWP Fusion Bomb 70
Blaster Bomb 100