Linedef type 457

Linedef type 457, Track Object's Angle, is a type of linedef executor which, when triggered, starts tracking whether the triggering Object is facing a specified Object Angle Anchor. If the Object faces too far away from the anchor for too long, another linedef executor will be executed. This effect is used in Tutorial Zone to train players how to move while keeping their view on another Object.

Setup

Place an Object Angle Anchor at the desired position in the map. Tag this linedef to the sector the anchor is placed in and make sure the tag is not used by any other sector. Once any Object triggers this linedef executor, the game will start tracking whether the Object is facing towards the anchor. The Object does not have to be a player. The front X offset determines how far away the tracked Object may face from the anchor, measured as an angle in degrees. The front Y offset determines how long the tracked Object may look away from the anchor, measured in tics. If the tracked Object faces away from the anchor by more than the specified angle for more than the specified number of tics, a trigger linedef is called. The tag of the trigger linedef is specified by the back X offset.

Normally, the tracking is stopped once the trigger linedef is executed for the first time. If Flag [7] / No Midtexture Skew / Effect 2 is set, the tracking continues afterwards. If the tracked Object triggers a linedef executor with linedef type 458, the tracking is also stopped.

Sample

Example file: Ex_ld457_trackobjectsangle.wad (MAP01)

When the player steps on the grass, object angle tracking starts.
When the player turns away from the sunflowers, he teleports to the REDFLR floor.

How to use
You may load this file into your favorite map editor, such as Zone Builder. Select `MAP01` as the map to load. You may also load this file in the game: Save `Ex_ld457_trackobjectsangle.wad` into the `addons` folder of your SRB2 directory. Start SRB2, go to the Addons menu, and then select `Ex_ld457_trackobjectsangle.wad`. Start the game in Single Player mode. Press the Console button (`~`), and type in the command `MAP MAP01` to access the example map. When you load this file in the game, it replaces Greenflower Zone Act 1.

	Linedef types – Linedef executors	[view]
Triggers: Continuous • Each Time • Once • Ring Count (Continuous • Once) • Character Ability (Continuous • Each Time • Once) • Race Only – Once • CTF Red Team (Continuous • Each Time) • CTF Blue Team (Continuous • Each Time) • No More Enemies – Once • Number of Pushables (Continuous • Once) • Condition Set Trigger (Continuous • Once) • Unlockable (Continuous • Once) • Trigger After X Calls (Continuous • Each Time) • NiGHTSerize (Each Time • Once) • De-NiGHTSerize (Each Time • Once) • NiGHTS Lap (Each Time • Once) • Ideya Capture Touch (Each Time • Once) • Player Skin (Continuous • Each Time • Once) • Object Dye (Continuous • Each Time • Once) • Emerald Check (Continuous • Each Time • Once) • NiGHTS Mare (Continuous • Each Time • Once) • Gravity Check (Continuous • Each Time • Once) • Level Load

Actions:
Sector: Set Tagged Sector's Floor Height/Texture • Set Tagged Sector's Ceiling Height/Texture • Copy Light Level to Tagged Sectors • Set Tagged Sector's Flats • Change Tagged Sectors' Tag • Change Front Sector's Tag • Start Adjustable Flickering Light • Start Adjustable Pulsating Light • Start Adjustable Blinking Light (unsynchronized) • Start Adjustable Blinking Light (synchronized) • Fade Light Level • Stop Lighting Effect • Change Plane Scroller Direction • Set Tagged Sector's Light Level
Plane movement: Move Tagged Sector's Floor • Move Tagged Sector's Ceiling • Move Floor According to Front Texture Offsets • Move Ceiling According to Front Texture Offsets • Stop Plane Movement • Start Platform Movement • Crush Ceiling Once • Crush Floor Once • Crush Ceiling and Floor Once
Player/Object: Teleporter • Change Object State • Stop Object • Award Score • Enable/Disable 2D Mode • Enable/Disable Gravity Flip • Award Power-Up • Disable Player Control • Change Object Size • Change Object Type State • Enable Bosses with Parameter • Track Object's Angle • Stop Tracking Object's Angle • Award Rings • Spawn Object • Stop Timer/Exit Stage in Record Attack • Dye Object • Trigger Egg Capsule
Other: Change Music • Play Sound Effect • Run Script • Switch to Cut-Away View • Change Sky • Change Weather • Shatter FOF • Change Tagged Linedef's Textures • Start Metal Sonic Race • Condition Set Trigger • Call Lua Function • Earthquake • Make FOF Disappear/Reappear • Make FOF Crumble • Change Tagged Sector's Colormap • Change Skybox • Execute Linedef Executor (from Tag) • Execute Linedef Executor (Random Range) • Set FOF Translucency • Fade FOF • Stop Fading FOF • Fade Tagged Sector's Colormap • Stop Fading Tagged Sector's Colormap • Control Text Prompt • Toggle Level Fail
PolyObject: Door Slide • Door Swing • Move • Move, Override • Rotate Right • Rotate Right, Override • Rotate Left • Rotate Left, Override • Move by Waypoints • Turn Invisible, Intangible • Turn Visible, Tangible • Set Translucency • Fade Translucency