func_tank
func_tank is a brush entity available in all 
GoldSrc games. It simulates a gun turret that can aim and shoot things.
Make sure Control Volume is set, as it's required. It can be controlled by a player using func_tankcontrols
It can also be used as a point entity by setting the model keyvalue to a precached model. The model should be authored so that its pivot point is at its origin (it will not animate).
Tip:The precaching can be achieved by placing a cycler elsewhere in the map, (which can be killtargeted by a trigger_auto), and using zhlt_usemodel to target the model. The func_tank itself should have an origin brush.
Note:The defined model is automatically precached in 
.Key Values
- Bullets
(bullet)<choices>
# Description 0 None 1 9mm 2 MP5 3 12mm
Targetname:
- Name
(targetname)<string> - The targetname that other entities refer to this entity by.
Target:
- Target
(target)<targetname> - The targetname of an entity this entity will trigger when activated.
Global:
- Global Entity Name
(globalname)<string> - Name to identify entity accross level transitions. Entities with the same global name will have the same status accross maps.
- Pitch Yaw Roll (Y Z X)
(angles)<angle> - This entity's orientation in the world. Pitch is rotation around the Y axis, yaw is the rotation around the Z axis, roll is the rotation around the X axis.
- Render FX
(renderfx)<choices> - Render FX mode to use, for special effects.
Value Description 0 Normal 1 Slow Pulse 2 Fast Pulse 3 Slow Wide Pulse 4 Fast Wide Pulse 5 Slow Fade Away 6 Fast Fade Away 7 Slow Become Solid 8 Fast Become Solid 9 Slow Strobe 10 Fast Strobe 11 Faster Strobe 12 Slow Flicker 13 Fast Flicker 14 Constant Glow 15 Distort 16 Hologram (Distort + fade)
- Render Mode
(rendermode)<choices> - Render Mode to use.
Value Description 0 Normal 1 Color 2 Texture 3 Glow 4 Solid 5 Additive
- Render Amount (0-255)
(renderamt)<integer> - Controls transparency when using another render mode then normal. 0 is completely invisible, and 255 is opaque. If render mode is solid, then all values except 0 are opaque.
- Render Color (R G B)
(rendercolor)<color255> - Color to use by the specified render mode.
Also used on brush entities to control the speed of scrolling textures; seefunc_conveyorfor more information.
- Master
(master)<targetname> - Name of a master entity. Mainly for use with 1009 team settings (game_team_master)
- Yaw rate
(yawrate)<string> - The speed of the left/right movement of the gun.
- Yaw range
(yawrange)<string> - Range of left/right movement in degrees.
- Yaw tolerance
(yawtolerance)<string> - Pitch rate
(pitchrate)<string> - The speed of the up/down movement of the gun.
- Pitch range
(pitchrange)<string> - Range of up/down movement in degrees.
- Pitch tolerance
(pitchtolerance)<string> - Barrel Leingth
(barrel)<string> - The distance from the center of the origin brush to the tip of the barrel.
- Barrel Horizontal
(barrely)<string> - Horizontal distance from the center of the origin brush to the center of the Barrel.
- Barrel Vertical
(barrelx)<string> - Vertical distance from the center of the origin brush to the center of the Barrel.
- Smoke Sprite
(spritesmoke)<string> - The sprite that will be shown at the end of the barrel when the gun is fired.
- Flash Sprite
(spriteflash)<string> - The sprite that will be shown at the end of the barrel when the gun is fired.
- Sprite Scale
(spritescale)<string> - Scale of the sprites that appear at the end of the barrel. 1 is normal, 0.5 is half, etc.
- Rotate Sound
(rotatesound)<sound> - Rate of Fire
(firerate)<string> - Number of bullets fired per second.
- Damage Per Bullet
(bullet_damage)<string> - Default is 0, so if you want it to kill things you must enter something.
- Firing persistence
(persistence)<string> - Used by non-player-controlled guns to determine for how long the gun carries on firing after the player has left its range.
- Bullet accuracy
(firespread)<choices>
# Description 0 Perfect Shot 1 Small cone 2 Medium cone 3 Large cone 4 Extra-large cone
- Minmum target range
(minRange)<string> - Minimum range the target can be at for a non-player-controlled gun to fire.
- Maximum target range
(maxRange)<string> - Maximum range the target can be at for a non-player-controlled gun to fire.
- Minimum light level
(_minlight)<string> - The minimum light level the entity will have, even if its initial position in the editor is in a purely dark room. This is a very aggressive value, so even a value of 0.02 will make the entity relatively bright.
Flags
Active : [1]
Only Direct : [16]
Controllable : [32]
- Minimum light level
(_minlight)<normal>
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Note:If any of the booleans are set in worldspawn, they can be disabled per entity by being set to -1.
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