User:haravikk Mistral/LlCastRay

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/LSL

CastRay

User:llCastRay

	LSL Feature Request
	The described function does not exist. This article is a feature request.

Summary

Function: llCastRay( vector origin, vector normal, float range, integer type, list detect );

0.0	Forced Delay
10.0	Energy

Casts a ray from origin along the direction described by normal until either range is reached, the ray hits a region boundary, or the results limit is reached.

• vector	origin
• vector	normal
• float	range
• integer	type
• list	detect

Specification

• Results are filtered by type (see below), and the data to capture is described by detect (see below, default is [DETECT_KEY, DETECT_TYPE]).
• This function will trigger a sensor() event with any results found, or a no_sensor() event if no results were detected. The usable llDetected*() functions within the sensor event are determined by detect.

Constant	Description
AGENT	Avatars, optionally identified by their display name.
AGENT_BY_LEGACY_NAME	Avatars, optionally identified by their legacy name.
AGENT_BY_USERNAME	Avatars, optionally identified by their username.
ACTIVE	Physical objects that are moving or objects containing an active script.
PASSIVE	Non-scripted or script is inactive and non-physical or, if physical, not moving.
SCRIPTED	Objects that has any script, which is doing anything in simulator just now.
LAND	The simulator's ground segments (only supported by llCastRay()).

Constant	Description
DETECT_ALL	Convenience entry to return all available data. Essentially this is the same as providing a list with all other DETECT_* constants valid for the current function, excluding those asking specifically for root-prims, avatar username, or avatar legacy name.
DETECT_GROUP	Populates llDetectedGroup() with the key of the group that the detected object, avatar, or land belongs to.
DETECT_KEY	Populates llDetectedKey() with the key of the primitive or avatar that was detected. If land is detected this value will be NULL_KEY.
DETECT_ROOT_KEY	Populates llDetectedKey() with the key of the object root or avatar that was detected. If land is detected this value will be NULL_KEY.
DETECT_LINK_NUMBER	Populates llDetectedLinkNumber() with the link-number of the primitive that was detected. If an avatar or land were struck then this will be zero.
DETECT_NAME	Populates llDetectedName() with the name of the primitive or the display name of the avatar that was detected. If land is detected this value will be an empty string.
DETECT_ROOT_NAME	Populates llDetectedName() with the name of the object root or display name of the avatar that was detected. If land is detected this value will be an empty string.
DETECT_LEGACY_NAME	Populates llDetectedName() with the name of the primitive or the legacy name of the avatar that was detected. If land is detected this value will be an empty string.
DETECT_ROOT_LEGACY_NAME	Populates llDetectedName() with the name of the object root or legacy name of the avatar that was detected. If land is detected this value will be an empty string.
DETECT_USERNAME	Populates llDetectedName() with the name of the primitive or the legacy name of the avatar that was detected. If land is detected this value will be an empty string.
DETECT_ROOT_USERNAME	Populates llDetectedName() with the name of the object root or username of the avatar that was detected. If land is detected this value will be an empty string.
DETECT_OWNER	Populates llDetectedOwner() with the UUID of the avatar that owns the detected object or land. If an avatar is detected then their key is returned here.
DETECT_POSITION	Populates llDetectedPos() with the position of the primitive that was detected.
DETECT_ROOT_POSITION	Populates llDetectedPos() with the position of the object root that was detected.
DETECT_ROTATION	Populates llDetectedRot() with the rotation of the primitive that was detected.
DETECT_ROOT_ROTATION	Populates llDetectedRot() with the rotation of the object root that was detected.
DETECT_TOUCH_BINORMAL	Populates llDetectedTouchBinormal() with the tangental normal vector of the point at which the object was detected.
DETECT_TOUCH_FACE	Populates llDetectedTouchFace() with the primitive face that was detected. If an avatar or land were detected then this will be TOUCH_INVALID_FACE.
DETECT_TOUCH_NORMAL	Populates llDetectedTouchNormal() with the normal vector of the point at which the object was detected.
DETECT_TOUCH_ST	Populates llDetectedTouchST() with the face coordinates of the point at which the object was detected. If an avatar or land are detected then this will be TOUCH_INVALID_TEXCOORD.
DETECT_TOUCH_UV	Populates llDetectedTouchUV() with the texture coordinates of the point at which the object was detected. If an avatar or land are struck then this will be TOUCH_INVALID_TEXCOORD.
DETECT_TYPE	Populates llDetectedType() with the type of object that was detected.
DETECT_VELOCITY	Populates llDetectedVel() with the velocity of the object that was detected.

Caveats

• A range of 0.0 or less will be ignored. Under LSO-LSL the maximum value of float can be used for what is effectively an infinity value, while under Mono true infinity can be provided.
• This function will return a maximum of 16 results (the limit of the sensor() event). The results are ordered such that the nearest result is first, followed by the second, and so-on.
• Only a single ray-cast can be performed by a script at a time; calling this function again before the sensor() event is triggered will interrupt the in-progress ray-cast and begin a new one.
• The sensor() and no_sensor() events may not trigger (ray-cast silently fails) if your script is triggering ray-casts too frequently. The simulator will make a best effort to complete requests, though these may be delayed depending upon script or physics-lag for the region.

Examples

<lsl>default {

   state_entry() {
       llSetTimerEvent(30.0);
   }
   timer() {
       llCastRay(llRot2Fwd(llGetRot()), 20.0, AGENT, [DETECT_NAME]);
   }
   sensor(integer x) {
       string message = "Hi there"; integer first = TRUE;
       while ((--x) >= 0) {
           if (first) first = FALSE;
           else if (!x) message += " and ";
           else message += ", ";

           message += llDetectedName(x);
       }
       llSay(PUBLIC_CHANNEL, (message = "") + message + "!");
       // Produces a message such as:
       // "Hi there, Haravikk Mistral, Strife Onizuka and Kelly Linden!"
   }

}</lsl>

Notes

To support this version of the llCastRay() implementation, please vote on SVC-6442

Deep Notes

Signature
//function void llCastRay( vector origin, vector normal, float range, integer type, list detect );