[Opensim-users] llVolumeDetect

[Fred Beckhusen]

I use llVolumeDetect()  to detect avatar collisions to trigger game 
effects and teleports when an avatar falls into water or fire, or walks 
into a rabbit hole.

The widely used hypergrid "Blamgate" teleporter I based my work on would 
sometimes not work after a reset.   The llVolumeDetect prim property did 
not get preserved after a restart.

I eventually figured out that a changed()  event with the 
Opensim-specific CHANGED_REGION_RESTART ( not CHANGED_REGION_START) flag 
is needed to turn llVolumeDetect(FALSE) and llVolumeDetect (TRUE) again. 
This will turn the collision off and on again. I have found this, and 
only this, works reliably.

// Works in

default
{
     state_entry()     {
         llVolumeDetect(TRUE);
     }
     collision_start(integer total_number)    {
         llSay(0, "Bumped: "+(string)total_number);
     }
     changed(integer what)    {
         if (what & (CHANGED_REGION_RESTART)    // not 
CHANGED_REGION_START, that is for Second Life, REstart is for Opensim
         {
             llVolumeDetect(FALSE);    // toggle bug fix in Opensim
             llVolumeDetect(TRUE);
         }
     }
}

--ooo------/\/\/\-----|(------ooo------/\/\/\-----|(------ooo----
Ferd Frederix/Fred K. Beckhusen
http://www.outworldz.com