Series
Duke Nukem
11 games, 1991–2011.
Games
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The series by yearMechanics
A marked cell changed from the game before. “Uses” means the game has the mechanic, with no variant recorded yet.
Every claim, by mechanic and game
| Concept | Duke Nukem 3D
1996 |
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| Autoaim | - When a Duke Nukem 3D player fires the pistol, shotgun, or chaingun,
aim looks for a target within AUTO_AIM_ANGLE, 48 of 2,048 angle units (about 8.4°, computed), to either side of the facing; of those in sight, more than 512 along the facing, and with a height difference over that distance (scaled by 10) within 100 of the view's pitch, it takes the nearest along the facing, searching the sprite lists 10, 13, 1, and 2 in that order and stopping at the first list with a match, and skipping fellow players in co-op. The shot then turns to the target's angle (getangle) and takes the slope to a point ((xrepeat × tile height) << 1) + (5 << 8) above the target's z. Doom's P_BulletSlope traces only straight ahead and 5.625° to each side, and its bullet keeps the player's facing. Code
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| Damage formula | - Each shot a Duke Nukem 3D player fires from the pistol, shotgun, or chaingun carries the strength its actor declares in the CON script plus
TRAND%6 (0 to 5): 6 to 11 for the pistol (SHOTSPARK1), 10 to 15 for each of the shotgun's 7 pellets, and 9 to 14 for the chaingun; a monster's shot carries the strength alone. Each bullet from Doom's pistol, chaingun, or shotgun deals 5, 10, or 15. Code - A Duke Nukem 3D sprite's pending damage (
hittype[].extra) is set to −1 when the sprite is created and again each time ifhitbyweapon takes it; a shot that checkhitsprite handles in its default branch adds its damage to the pending total, and ifhitbyweapon subtracts the total from the target's health, so a target hit once between checks loses 1 less than the shot carries, and several hits between checks take 1 less than their sum (computed). An explosion's hitradius sets the pending damage outright for the targets it rolls for, so those lose the full roll. Code - A Duke Nukem 3D pipe bomb that goes off passes its strength, 140 (
HANDBOMB_WEAPON_STRENGTH), to hitradius with the radius PIPEBOMBRADIUS, 2,500; each sprite in lists 1, 6, 10, or 12 (not flammable) with extra of 0 or more that is a tripbomb, a monster (badguy), a QUEBALL, a STRIPEBALL, a DUKELYINGDEAD, or solid (cstat&257), within that dist and in sight of the blast, takes 105 to 139 inside a third of the radius, 70 to 104 inside two thirds, and 35 to 69 beyond: three quarters, a half, or a quarter of the strength plus TRAND modulo the next band's gap, 35 (computed). A monster in sprite list 2, which the hit wakes into list 1, goes through checkhitsprite instead unless a sight test at a random height fails, and loses 139 at any distance in the radius, the bomb's 140 added to its pending −1; a bomb set off by a hit first loses that hit's damage from its strength. A Doom rocket's blast falls off linearly, 128 minus the distance. Code
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| Hitscan | |
| Running | - Duke Nukem 3D schedules its timer with
TS_ScheduleTask at a rate of TICRATE, 120, which the atlas reads as counts per second (the task manager's source isn't in the release), and faketimerhandler reads the player's input and queues one move every TICSPERFRAME counts, TICRATE/26, which integer division makes 4; domovethings runs once per queued move, so on that reading the game runs 30 tics a second (computed), where Doom runs 35. Code - A Duke Nukem 3D keyboard sets the forward and side moves to 40 walking or 80 running (
NORMALKEYMOVE), each clamped apart to ±90 (MAXVEL, MAXSVEL); getinput turns the pair by the facing, and each tic processinput adds it to the player's velocity times TICSPERFRAME (4) and 64, doubled while steroids last and the jetpack is off, in the air as on the ground. A hard landing and a few other actions zero the velocity instead. Doom thrusts only on the floor, with moves of 25 or 50 forward and 24 or 40 sideways. Code - After the thrust, Duke Nukem 3D multiplies the player's velocity each tic by
dukefriction, which the CON's gamestartup sets from RUNNINGSPEED, 53,200 of 65,536 (0.812; the C default is 0xcc00, 0.797): 0x2000 less when kicking or crouching on the ground, 0x1400 less underwater, and three quarters of it again while shrunk; the velocity drops to 0 once both axes are under 2,048. A steady run moves 4.31 times the per-tic thrust (0.812 / 0.188, computed), and a released run falls under half its speed within 4 tics (computed). Doom keeps 0.90625 of its momentum each tic. Code
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| Strafe-running | |