HUD to toggle an attachment.

[Kaitopt]

Hi everyone. I'm new to LSL and scripting. I want to make a single button HUD that simply toggles the alpha of a prim attachment I created. To be clear, this attachment is made up of 5 prims and want a button to hide it and reveal it each time I click it. Thank you in advance.

[Rolig Loon]

Quite simply, your attachment needs a script that toggles alpha when it hears a signal from the HUD:

default
{
     state_entry()
     {
          llListen(my_channel,"","","");
     }

     listen(integer channel, string name, key id, string message)
     {
          if (message == "on")
          {
               llSetLinkAlpha(LINK_SET, 1.0,ALL_SIDES);
          }
          else if (message == "off")
          {
               llSetLinkAlpha(LINK_SET, 0.0, ALL_SIDES);
          }
     }
}

And your HUD needs to send a message when you click it:

integer iOn;

default
{
     touch_start(integer num)
     {
          llSay(my_channel,llList2String([ "off", "on" ], (iOn = !iOn) );
     }
}

Just be sure that you give my_channel the same value in both scripts.

[Quistess Alpha]

Welcome to the forums and to LSL scripting!

HUDs are one of the hardest things to script well in LSL. But for something this simple it should give you a good entry point

the first thing to know about HUDs is that they can't really do much to things in world (with a few fun notable exceptions) and generally speaking objects don't do things to other objects, they tell the objects to do things to themselves.

Part 1. Making a HUD.

HUDs are just like any other object, but you wear them in front of your face. so create a prim take it into your inventory and wear it as a HUD (details vary depending on viewer), then add a script like so:

@Rolig Loon beat me at typing; see her post.

then add a script that listens on the same channel to your object

See Rolig's example

Quite simple really.

 

Edited May 10, 2021 by Quistessa
added grammar.

[Kaitopt]

Thank you so much for the help. I learned about HUDs being objects back in the poseball days using root prims to make "pose anywhere" HUDs lol.