Difference between revisions of "Hello Avatar"

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{{LSL Header}}
{{LSL Header|ml=*}}


== The New Script ==
The following script contains the default code that is placed in every new script. It says "''Hello, Avatar''" when it is saved or reset and says "''Touched.''" when it is touched. That makes it the LSL representation of the famous [http://en.wikipedia.org/wiki/Hello_world_program Hello world program].


The script you get from the SL GUI, when first you ask to create a New Script in an object or in your inventory, was this script, as of 2007-08:
<source lang="lsl2">
 
<pre>
default
default
{
{
Line 18: Line 16:
     }
     }
}
}
</pre>
</source>
 
That script shows you how to get something to happen when you save or reset the script.
 
The example thing that happens is { llSay(0, "Hello, Avatar!"); }. The other example thing happens when you touch the object.
 
== How To Try New Lines of Code ==
 
You're supposed to notice that you can edit this script and click the Save button repeatedly to try out new code.
 
For example, you might try:
 
<pre>
default
{
    state_entry()
    {
        llSetText("look at me blue", <0.0, 0.0, 1.0>, 1.0);
        llOwnerSay("OK");
    }
}
</pre>
 
Each time you edit and Save, the SL GUI will compile and run your new line of code. Every time you click Reset, the SL GUI will run your one line of code again.
 
== Your First New Lines of Code ==
 
Exploring new commands in this way can run you thru a long series of demoes that teach you about how scripts work, such as the following.
 
* Twiddle the red, green, and blue intensity, also the "alpha" opacity/ transparency:
<pre>
        llSetColor(<0.3, 0.3, 0.3>, ALL_SIDES); // darken
        llSetColor(<1, 1, 1>, ALL_SIDES); // lighten
        llSetAlpha(0.7, ALL_SIDES); // make translucent
</pre>
 
* Twiddle the label of the object running the script:
<pre>
        llSetText("look at me green", <0.0, 1.0, 0.0>, 1.0); // label
        llSetText("look at me black", <0.0, 0.0, 0.0>, 1.0); // label differently
        llSetText("", <0.0, 0.0, 0.0>, 1.0); // do not label
</pre>
 
* Move and rotate while not physical, then kick and spin while physical and bouncy.
<pre>
        llSetStatus(STATUS_PHYSICS, FALSE); llSleep(0.1);
        llSetPos(llGetPos() + <0.0, 0.0, 2.1>); // teleport up the Z axis
        llSetPos(llGetPos() - <0.0, 0.0, 2.1>); // teleport back down the Z axis
        llSetLocalRot(llEuler2Rot(<0.0, 0.0, PI_BY_TWO>)); // face one way
        llSetLocalRot(llEuler2Rot(ZERO_VECTOR)); // face another way
        llSetStatus(STATUS_PHYSICS, TRUE); llSleep(0.1);
        llSetBuoyancy(0.9); // bounce well, without floating
        llApplyImpulse(<0.0, 0.0, 1.0>, TRUE); // advance along the Z axis
        llApplyRotationalImpulse(<0.0, 0.0, 3.0>, TRUE); // yaw about the Z axis
        llSetStatus(STATUS_PHYSICS, FALSE); llSetStatus(STATUS_PHYSICS, TRUE); // zero rot inertia
</pre>


* Poke around inside the object running the script:
Notes:
<pre>
* Scripters should learn to call the simpler [[llOwnerSay]] rather than llSay, in order to avoid making objects that spam the neighborhood via [[PUBLIC_CHANNEL]] zero.
        llOwnerSay(llList2CSV([ZERO_VECTOR, FALSE, TRUE, STATUS_PHYSICS, PI])); // reveal some named code values
        llOwnerSay((string) llGetAgentSize(llGetLinkKey(llGetNumberOfPrims()))); // often not ZERO_VECTOR while avatar sits
</pre>


* Chat a question for you the object's owner to answer (and then chat the answer that you chose):
* Scripters should learn to call [[llInstantMessage]] rather than llSay, in order to stop losing chat while far away or logged off.
<pre>
        llDialog(llGetOwner(), "A clarifying demo?", ["No", "Yes"], 7); // chat some Q & A
</pre>


{{#vardefine:sort|Hello Avatar}}{{LSLC|Library}}{{LSLC|Examples}}
{{#vardefine:sort|Hello Avatar}}{{LSLC|Library}}{{LSLC|Examples}}
{{LSLC|Tutorials}}
{{LSLC|Tutorials}}

Latest revision as of 12:26, 24 January 2015

The following script contains the default code that is placed in every new script. It says "Hello, Avatar" when it is saved or reset and says "Touched." when it is touched. That makes it the LSL representation of the famous Hello world program. 

default
{
    state_entry()
    {
        llSay(0, "Hello, Avatar!");
    }

    touch_start(integer total_number)
    {
        llSay(0, "Touched.");
    }
}

Notes:

  • Scripters should learn to call the simpler llOwnerSay rather than llSay, in order to avoid making objects that spam the neighborhood via PUBLIC_CHANNEL zero.
  • Scripters should learn to call llInstantMessage rather than llSay, in order to stop losing chat while far away or logged off.
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