Talk:LlCastRay

llSonar please?

I would appreciate if you took in consideration my suggestions at http://jira.secondlife.com/browse/SVC-2486 please; any feedback is more than welcome.

ps:llCastRay is already awesome, you rock! Please try the hardest you can to figure out how to get this to come to the maingrid with the least crippling as possible.

--TigroSpottystripes Katsu 03:01, 3 July 2010 (UTC)

What am I looking at?

A function I just threw in to replace phantom bullets for quickly acquiring a point of interest -- whatever your camera's focused on (in this sim, within 20m) is returned, allowing quicker, more intuitive targeting of other objects. PERMISSION_TRACK_CAMERA must be previously set.

<lsl>key camPing() {

   // End points at the camera and 20m in front of it
   vector camPos = llGetCameraPos();
   vector endPos = camPos + ( <20.0, 0., 0.> * llGetCameraRot() );

   // Clamp the end position to within the sim
   if ( endPos.x > 255.0 ) endPos.x = 255.0;
   else if ( endPos.x < 0.0 ) endPos.x = 0.0;
   if ( endPos.y > 255.0 ) endPos.y = 255.0;
   else if ( endPos.y < 0.0 ) endPos.y = 0.0;

   // Cast the ray; ignore hits on land, otherwise get the root key
   list contacts = llCastRay( camPos, endPos, 
       RC_REJECT_LAND,
       RC_GET_ROOT_KEY );

   // Return values
   if ( llList2Integer( contacts, -1 ) > 0 ) { // Got a return
       return llList2Key( contacts, 0 );
   }
   return NULL_KEY;

} </lsl>

Jack Abraham 04:42, 3 July 2010 (UTC)

RC_GET_LINK_NUM? Not RC_GET_LINK_KEY?

I can't think of a circumstance where knowing the link number of the return would be useful. UUID of the prim hit would be far more useful; is that within the realm of possibility? Jack Abraham 04:47, 3 July 2010 (UTC)