User:Jack Abraham

Lantern by day, filler of blank (personal) pages.

Code Snippets

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. Requires llCastRay.

<lsl>key camPing() {

   // End points at the camera and 20m in front of it
   vector camPos = llGetCameraPos();

   // Clamp the end position to within the sim
   // From an SLUniverse post by Chalice Yao
   // http://www.sluniverse.com/php/vb/scripting/46344-llcastray-available-testing-maybe-only.html#post969497
   float xSteps;
   float ySteps;
   vector camRot = llRot2Fwd(llGetCameraRot());
   fXSteps = llAbs( ( 256.0 * !!camRot.x ) - camPos.x ) / camRot.x;
   fYSteps = llAbs( ( 256.0 * !!camRot.y ) - camPos.y ) / camRot.y;
   if(xSteps > ySteps)
       xSteps = ySteps;
   if ( xSteps > 20.0 )
       xSteps = 20.0

   // Cast the ray; ignore hits on land, otherwise get the root key
   list contacts = llCastRay( camPos, camPos + ( camRot * xSteps ), 
       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>