Beginning Scripting

LIB 287 - Jeremy Kemp

Second Life

• Avatar customization

• Community Building

• 3D Modeling

• Economy

• Object Interactions

Linden Scripting Language

• “LSL” makes objects interactive• Allows commerce, serious gaming,

interfaces, web connectivity• “event execution model”

(unique in this way)• Awkward use of data• Linked objects may perform

independent actions

Variables hold data

• They come in flavors (types)

• Have meaning to the ENTIRE script or only a portion of it

• Using them properly is one of the hardest jobs in scripting

Variable Types

• Float = floating point or real number• Integer = positive whole number• String = a text word or phrase• Vector = a set of three floats

– rgb color, xyz pos, xyz vel, xyz accel

• Key = uuid - object identity• Rotation = x,y,z,s - hard!• List = rough database

Global vs Local Variables

• Declare global variables at top of the script - they are usable throughout

• Declare local variables inside the block it will be used in

Typecasting

• a=(string)b

Rotate script

default

{

state_entry()

{

llTargetOmega( < 0, 0, 1 >, .01, 1.0 );

}

}

URL Loader script

default

{touch_start(integer total_number)

{

llLoadURL(llDetectedKey(0), "Name", “site.com");

}

}

•

Giver script

default

{touch_start(integer total_number)

{

llGiveInventory(llDetectedKey(0), “item”);

}

}

•

Hello World

default{ state_entry() { llSay(0, "Hello, Avatar!"); } touch_start(integer total_number) { llSay(0, "Touched."); }}

Floating text

default{

state_entry(){

llSetText("Text", <1,1,1>, 2.0);}

}

Color by Numbers

Other Possible Events

• collision(integer total_number)

• sensor(integer total_number)

• money(key giver, integer amount)

• changed(integer changed)

Loops

• for (j = 0; j < count; j++)

{ // do stuff here }• do

{

// do stuff here and increment j

} while (j < count);• while (j < count)

{ // do stuff here and increment j }

More info

• http://lslwiki.net– LSL 101: The Complete Newbie's Guide to

Scripting in Second Life

• http://slurl.com/secondlife/Daydream%20SE%20Islands/206/40– Bromley College walkthrough