Rezzes a ball for each avatar in range. Each ball tracks it's on AV and displays distance.

Scanner/Rezzer Script

Place this script in a prim along with the scan ball. When touched it will scan the surrounding area and rezz a ball for each avatar.

Suggestion: Create a sphere with a diameter of 2 meters. Set transparency about 60. Create another sphere about 0.05 diameter, color a dark color and put it in the center of the large prim. Select small prim 1st and then large prim and link them. This will give you a center point to reference. The scan ball script is set to scan for it's avatar to a range of 96 meters.

This formula: vector avDivPos = (avPos - rPos) * 0.010417; Takes the (avatars position - position of scanner) & multiplies by (radius of the distance you want the balls to go(2 meter sphere = 1 meter radius)/scan range(96meters)):

1/96 = approximately 0.010417

//////////////////////////////////////////////////////////////////////////////////////////////////////
//				3D Radar 2.5
// 				"Oct 15 2008", "18:43:28"
// 				Creator: Jesse Barnett
//				Released into the Public Domain
//////////////////////////////////////////////////////////////////////////////////////////////////////
 
integer Scan = TRUE;
string avKey;
integer list_pos;
list key_list;
integer key_chan;	//Key channel is generated randomly and passed to the scan ball
integer die_chan = -9423753;	//Hey pick your own channels and be sure to paste them into
						//the scan balls too!
integer key_rem_chan = -49222879;
default {
	state_entry() {
		llSetObjectName("3D Radar");
	}
	touch_start(integer total_number) {
		if (Scan) {
			llSensorRepeat("", "", AGENT, 96, PI, 1);
			key_list =[];
			llListen(key_rem_chan, "", "", "");
			llOwnerSay("on");
			Scan = FALSE;
		}
		else {
			llSensorRemove();
			llRegionSay(die_chan, "die");
			llOwnerSay("off");
			Scan = TRUE;
		}
	}
	sensor(integer iNum) {
		integer p = 0;
		for (p = 0; p < iNum; ++p) {
			avKey = llDetectedKey(p);
			list_pos = llListFindList(key_list, (list)avKey);
			if (list_pos == -1) {
				key_list += (list) avKey;
				key_chan = (integer) llFrand(-1000000) - 1000000;
				llRezObject("scan ball", llGetPos(), ZERO_VECTOR, ZERO_ROTATION, key_chan);
				llSleep(.25);
				llRegionSay(key_chan, avKey);
			}
		}
	}
	listen(integer c, string name, key id, string msg) {
		integer r = llListFindList(key_list,[(key)msg]);
		key_list = llDeleteSubList(key_list, r, r);
	}
}

Scan Ball Script

Place this script in a prim and then place the prim into the inventory of the Scanner/Rezzer. It will automatically name itself.

Suggestion; Create a sphere prim of 0.05 diameter with glow set about .80.

//////////////////////////////////////////////////////////////////////////////////////////////////////
//				3D Radar 2.5
// 				"Oct 15 2008", "18:44:36"
// 				Creator: Jesse Barnett
//				Released into the Public Domain
//////////////////////////////////////////////////////////////////////////////////////////////////////
 
string avName;
integer avDistance;
key avKey;
integer avListen;
integer key_chan;
integer die_chan = -9423753;
integer key_rem_chan = -49222879;
vector avPos;
vector rPos;
default {
	state_entry() {
		llSetObjectName("scan ball");
	}
	on_rez(integer start_param) {
		rPos = llGetPos();
		key_chan = start_param;
		llListen(die_chan, "", "", "");
		avListen = llListen(key_chan, "", "", "");
	}
	listen(integer c, string n, key id, string msg) {
		if (c == die_chan)
			llDie();
		else {
			avKey = (key) msg;
			avName = llKey2Name(avKey);
			llSensorRepeat("", avKey, AGENT, 96, PI, 1.0);
			llListenRemove(avListen);
		}
	}
	sensor(integer n) {
		avPos = llDetectedPos(0);
		vector avDivPos = (avPos - rPos) / (96 / 1);	//Scan range/Radius of large sphere
		avDistance = (integer) llVecDist(rPos, llDetectedPos(0));
		llSetPos(rPos + avDivPos);
		llSetText(avName + "[" + (string) avDistance + "]", <1, 1, 1 >, 1);
	}
	no_sensor() {
		llRegionSay(key_rem_chan, avKey);
		llDie();
	}
}