Prim to Prim Communication

Hi guys, hopefully this is a pretty simple question, Im sure there is a tutorial out there but I havent been able to find it searching these forums or google, so I pose my question here...

I would like to create a little touch screen type of object, composed of a few linked prims, that when one button (prim) is pressed, it changes the texture of another prim. This requires prim to prim communication and I am just a little confused on how to achieve this. Any help is appreciated, thanks!

Joshua

If they're linked, just use llMessageLinked and link_message. Otherwise you'll need to use chat and listens or some other form of less direct communication.

Note however that it MAY NOT require communication between prims. If only one prim is going to be touched, or if you don't mind handling all the touches from a script in the root prim, you COULD do it using llSetLinkPrimitiveParams() instead of link messages. See http://www.lslwiki.net/lslwiki/wakka.php?wakka=llSetLinkPrimitiveParams

Never been to the LSL Wiki/Portal http://wiki.secondlife.com/wiki/LSL_Portal yet?

With linked prims on a hud you pass the touches to the root w/script and use either llDetectedLinkNum or llGetLinkName to see which prim was touched. Here is a basic example script, link 4 prim together and then drop this script in it:

integer prim_num;
string prim_name;
vector color;

default {
	touch_start( integer n ) {
		prim_num = llDetectedLinkNumber(0);
		prim_name= llGetLinkName(prim_num);
		if(prim_num == 1){
			color = <1, 1, 1>;
			llOwnerSay("I am also the Root Prim");
		}
		else if(prim_num == 2) color = <0, 0, 1>;
		else if(prim_num == 3) color = <0, 1, 0>;
		else if(prim_num == 4) color = <1, 0, 0>;
		llSetPrimitiveParams([PRIM_COLOR, ALL_SIDES, color, 0.6]);
		llOwnerSay( "Prim name: " + prim_name +
		", link #" + (string)prim_num + " touched." );
	}
}