c_scan

c_scan (VECTOR* pos, ANGLE* ang, VECTOR* sector, var mode);

Detects entities or other objects within a cone or sphere, and triggers their EVENT_SCAN event.

Parameters:

pos	scan origin.
ang	scan direction Euler angle.
sector.x	horizontal scan sector, or scan cone width in degrees (360 for a full sphere)
sector.y	vertical scan sector in degrees, or 0 for a circular scan cone.
sector.z	scan range in quants.
mode	scan mode (see below).

The following mode values can be set:

IGNORE_ME	Ignores the me entity; to be combined with SCAN_ENTS.
IGNORE_YOU	Ignores the you entity; to be combined with SCAN_ENTS.
IGNORE_PASSABLE	A7.2 LC Ignores entities with the PASSABLE flag; to be combined with SCAN_ENTS.
IGNORE_FLAG2	A7.2 LC Ignores entities with FLAG2; to be combined with SCAN_ENTS.
SCAN_ENTS	Scans for entities within the cone, and triggers their EVENT_SCAN event.
SCAN_POS	Scans for camera positions placed in the level.
SCAN_PATHS	Scans for path start positions.
SCAN_NODES	Scans for path node positions.
SCAN_LIGHTS	Scans for static lights.
SCAN_LIMIT	Finds only entities with ENABLE_SCAN set, or only static lights whose range can reach the scan origin. Can be combined with SCAN_ENTS and SCAN_LIGHTS.
SCAN_FLAG2	A7.2 LC Opposite of IGNORE_FLAG2: Finds only entities with FLAG2.

Returns:

Distance to closest object found, or 0 if no object was found.

Modifies:

you	Pointer to the closest detected entity.
result	Distance to the closest detected object.
target	Position of the closest detected object.
bounce	Direction to the closest detected camera position.
tex_color	Color of the closest detected static light.

Remarks:

SCAN_ENTS scans for the object's origin only. If you have a large object, make sure the origin still lies within the scan cone.
If any entity with ENABLE_SCAN set is found with it's center within the scan segment, it's event function is triggered with event_type set to EVENT_SCAN, result set to the distance and you set to the scanning entity, if any.
If the my entity has ENABLE_DETECT set, it's event function is triggered once for every detected entity. During the event, event_type is set to EVENT_DETECT and you is set to the detected entity. This way all detected entities can be enumerated.
To prevent that a scanning entity triggers itself, set IGNORE_ME. To ignore a certain entity, set me or you to the entity pointer.
The function scans through walls - so don't use it for gunshots (use c_trace for that). However it is very useful to open doors, set switches, detect or alert enemies, apply explosion damage and so on.

Speed:

Slow

Example:

function operate() // scan nearby doors or switches for operating them
{
 	c_scan(camera.x,camera.pan,vector(120,0,200),SCAN_ENTS | SCAN_LIMIT);
}
...
on_space = operate;