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 Post subject: Fall is here in full force so... How bout some Leaves?
PostPosted: Tue Nov 02, 2010 9:49 pm 
Furious Typer
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Joined: Mon Aug 10, 2009 11:53 pm
Posts: 258
Greets all. I took the Rain Particle Script from the Script post here in these forums, ( Can be found here: viewtopic.php?f=5&t=2767 ) and reworked the numbers a bit. I am a particle geek, but realize that a lot of people have trouble with them (I still do) so here it is for you if you have a fancy for some gently falling leaves.

Just drop your favorite Leaf texture into a prim with this script, along with the touch / activate script from the original post if you like as well, and you will have a nice bit of falling leaves for your trees. Goes nicely with a few alpha prims of leaves lying around on the ground :)

[NOTE]: you will either need to rename your leaf texture to "leaf" once you've dropped it in, or you can change the script below to reflect the name of your texture.

Take care,

//// "Rain" PARTICLE TEMPLATE v1 - by Jopsy Pendragon - 4/8/2008

//// -> TEMPLATE CHANGED FOR FALLING LEAVES - by Haplo Voss - 11/2/2010 <-

//// You are free to use this script as you please, so long as you include this line:
//** The original 'free' version of this script came from THE PARTICLE LABORATORY. **//

// SETUP:  Drop one optional particle texture and this script into a prim.
// Particles should start automatically. (Reset) the script if you insert a
// particle texture later on.  Add one or more CONTROLLER TEMPLATES to any
// prims in the linked object to control when particles turn ON and OFF.

// Customize the particle_parameter values below to create your unique
// particle effect and click SAVE.  Values are explained along with their
// min/max and default values further down in this script.

string  CONTROLLER_ID = "A"; // See comments at end regarding CONTROLLERS.
integer AUTO_START = TRUE;   // Optionally FALSE only if using CONTROLLERS.

list particle_parameters=[]; // stores your custom particle effect, defined below.
list target_parameters=[]; // remembers targets found using TARGET TEMPLATE scripts.

default {
    state_entry() {
        particle_parameters = [  // start of particle settings
           // Texture Parameters:
           PSYS_SRC_TEXTURE, "leaf",
           PSYS_PART_START_SCALE, <.4,.4, FALSE>,  PSYS_PART_END_SCALE, <.5,.5, FALSE>, 
           PSYS_PART_START_COLOR, <1,1,1>,      PSYS_PART_END_COLOR, <1,1,1>,
           PSYS_PART_START_ALPHA, (float)0.5,       PSYS_PART_END_ALPHA, (float)1.0,     
           // Production Parameters:
           PSYS_SRC_BURST_PART_COUNT, (integer)5,
           PSYS_SRC_BURST_RATE, (float) 25.00, 
           PSYS_PART_MAX_AGE, (float)15.0,
           PSYS_SRC_MAX_AGE,(float) 0.0, 
           // Placement Parameters:
           PSYS_SRC_PATTERN, (integer)2, // 1=DROP, 2=EXPLODE, 4=ANGLE, 8=ANGLE_CONE,
           // Placement Parameters (for any non-DROP pattern):
           PSYS_SRC_BURST_SPEED_MIN, (float)0.5,   PSYS_SRC_BURST_SPEED_MAX, (float)0.0,
           PSYS_SRC_BURST_RADIUS, 5.0,
           // Placement Parameters (only for ANGLE & CONE patterns):
           PSYS_SRC_ANGLE_BEGIN, (float) .25*PI,   PSYS_SRC_ANGLE_END, (float)0.0*PI, 
        // PSYS_SRC_OMEGA, <0,0,0>,
           // After-Effect & Influence Parameters:
           PSYS_SRC_ACCEL, <0.0,0.0,-.8>, 
        // PSYS_SRC_TARGET_KEY,      llGetLinkKey(llGetLinkNum() + 1),       
           PSYS_PART_FLAGS, (integer)( 0         // Texture Options:     
                                | PSYS_PART_INTERP_COLOR_MASK   
                                | PSYS_PART_INTERP_SCALE_MASK   
                                | PSYS_PART_EMISSIVE_MASK   
                             // | PSYS_PART_FOLLOW_VELOCITY_MASK
                                                  // After-effect & Influence Options:
                                | PSYS_PART_WIND_MASK           
                             //   | PSYS_PART_BOUNCE_MASK         
                             // | PSYS_PART_FOLLOW_SRC_MASK     
                             // | PSYS_PART_TARGET_POS_MASK     
                             // | PSYS_PART_TARGET_LINEAR_MASK   
            //end of particle settings                     
        if ( AUTO_START ) llParticleSystem( particle_parameters );
    link_message( integer sibling, integer num, string mesg, key target_key ) {
        if ( mesg != CONTROLLER_ID ) { // this message isn't for me.  Bail out.
        } else if ( num == 0 ) { // Message says to turn particles OFF:
            llParticleSystem( [ ] );
        } else if ( num == 1 ) { // Message says to turn particles ON:
            llParticleSystem( particle_parameters + target_parameters );
        } else if ( num == 2 ) { // Turn on, and remember and use the key sent us as a target:
            target_parameters = [ PSYS_SRC_TARGET_KEY, target_key ];
            llParticleSystem( particle_parameters + target_parameters );
        } else { // bad instruction number
            // do nothing.

//============================= About Parameters =============================
// There are 22-ish NAMED attributes that affect a particle display.
// To customize a display you give each a VALUE.
// For example: PSYS_PART_START_COLOR is a named attribute,
// and <1.0, 0.5, 0.0> is a color VALUE (orange, in this case).
// As long as your 'names' and 'values' are paired up properly, they can
// be in any order!  Any you omit a pair, it reverts to a default value.

//============================= Texture Parameters =============================
// TEXTURE, can be an "Asset UUID" key copied from a texture
//          that you have full permissions to, or the name of
//          a texture in the prim's inventory.
// SCALE, (size) 0.0 to 4.0 meters wide, by 0.0 to 4.0 meters tall. (default 1x1)
//          Textures are FLAT, so the 'z' part of the vector is ignored.
//          Values smaller than 0.04x0.04 may not get rendered at all.
//          Tiny particles vanish if the viewer is not near them.
// BEGIN_SCALE sets particle start size. 
// END_SCALE (end size) is ignored, if the INTERP_SCALE_MASK option is disabled.
// COLOR, < RED, GREEN, BLUE > from <0.00,0.00,0.00> (black) to <1.00,1.00,1.00> (white/default)
// ALPHA, 1.0 = 100% visible(default), 0.0 = invisible.  Less than 0.1 might not get seen.
// START_COLOR and START_ALPHA set the color and transparency of newly created particles.
// END_COLOR and END_ALPHA are ignored, if the INTERP_COLOR_MASK option is disabled.
//============================= Production Parameters =============================
// BURST_PART_COUNT: quantity of particles per burst, 1 to 4096 (default 1),
// BURST_RATE: seconds to delay between particle bursts. 0.0 to 30.0 (default 0.1)
// PART_MAX_AGE: particle lifespan in seconds, 0.00 to 30.0 (default=10.0)
//               PART_MAX_AGE less than 0.5 might not be visible.
// The default total number of particles that can be seen is 4096, if one or more
// emitters try to create more than that, many will not be seen, and it may cause
// viewer lag.  Use as few particles as you can for your effect:
// AGE/RATE * COUNT will tell you approximately how many particles your emitter creates.
// SRC_MAX_AGE: emitter auto shut-off timer. 1.0 to 60.0 seconds. 0.0 = never stop. (default)

//============================= Placement Parameters =============================
// PATTERN:   
//      DROP, ignores all other placement settings.
//      EXPLODE, spray particles in all directions
//      ANGLE, sprays a flat "fan" shape defined by ANGLE_BEGIN and END values
//      CONE, sprays "ring" or "cone" shapes defined by ANGLE_BEGIN and END values
// RADIUS:  0.0 to 50.0?  distance from emitter to create new particles
//      (RADIUS is disabled with DROP pattern and the FOLLOW_SRC & TARGET_LINEAR options)
// SPEED: 0.00 to 50.0?  Sets min/max starting velocities for non-drop patterns. (default: 1.0)
// ANGLE_BEGIN & END:  0.00*PI (up) to 1.00*PI (down),  (Only for ANGLE & CONE patterns)
//       (Values work much like the Sphere-prim's DIMPLE attributes.) (defaults: 0.0)
// OMEGA: <x,y,z> Sets how much to rotate angle/cone spray direction after
//                every burst. 0.0 to PI?  (default: <0,0,0>)

//======================== After-Effects & Influence Parameters ================
// ACCEL, x,y,z 0.0 to 50.0?  sets a constant force, (affects all patterns)
//          Causes particles to drift up/down or in a compass direction.
//          Use ACCEL to create the illusion of (anti-)gravity or a directional wind.
//          (ineffective with TARGET_LINEAR option)
// TARGET_KEY,  "key", (requires the TARGET option be enabled). 
//       "key" can be a variety of many different things:
         // llGetOwner()
         // llGetKey() target self
         // llGetLinkKey(1) target parent prim
         // llGetLinkKey(llGetLinkNum() + 1) target next prim in link set
         // WARNING: New copies of objects get new keys, you can't simply paste
         // a prim's key into your script and expect it to always work.  Visit
         // the Particle Laboratory's section on TARGETS for a variety of ways
         // to dynamically find your target's key. There are different 'best ways'
         // depending on if your target is linked to your emitter or not.

//============================= About Options =============================
// Each option may be ON/ENABLED (no leading // )
// or OFF/DISABLED (by putting a // in front of it.)
// Options are combined together in a special way, (using the | symbol).
// This creates one single Parameter for PSYS_PART_FLAGS.

//============================= Texture Options =============================
// EMISSIVE: identical to "full bright" setting on prims     
// FOLLOW_VELOCITY: particle texture 'tilts' towards the direction it's moving
// INTERP_COLOR: causes particle COLOR and ALPHA(transparency) to change over it's lifespan
// INTERP_SCALE: causes particle SCALE(size) to change over it's lifespan

//======================== After-Effects & Influences Options ================
// BOUNCE:  particles bounce up from the z-altitude of emitter, and cannot fall below it.
// WIND: the sim's wind will push particles around
// FOLLOW_SRC: makes particles move (but not rotate) if their emitter moves, (disables RADIUS)
// TARGET_POS: causes particles to arrive at a some target at end of of their lifespan.
// TARGET_LINEAR: forces particles to form into an even line from emitter to target
//                and forces a DROP-like pattern and disables effects of WIND and ACCEL

//======================== USING CONTROL TEMPLATES =======================
// Want to control when your particles turn ON and OFF?   You can!
// Drop one (or more) of the CONTROL TEMPLATES from the particle laboratory
// into your object containing this script.  That's it!

// Your controls should be effective immediately.  (Some controllers can be
// adjusted and tuned, open them and read the USAGE notes to see.)
// One control template can control several particle templates in the
// same object.   (keep in mind that each prim can only have ONE
// particle effect active at a time).
// The 'particle_effect_name' value must be the same in both the control
// and particle template to work.  You can change that value and have
// a controller for one effect, and a different controller for a different
// effect in the same object.

//======================================== END ===============================

Sorry, I was just thinking upon the immortal words of Socrates who said ... "I drank what?? ... "
- Real Genius

Last edited by Haplo Voss on Wed Nov 03, 2010 8:09 pm, edited 1 time in total.

 Post subject: Re: Fall is here in full force so... How bout some Leaves?
PostPosted: Wed Nov 03, 2010 7:34 pm 
OSG Elite

Joined: Wed Aug 05, 2009 1:59 am
Posts: 411
cool! thanks Haplo!

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