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A nice, smooth particle system for chimneys and other smoking objects. It has white smoke.

// Keknehv Psaltery's Particle Script v1.1
// 1.0 -- 5/30/05
// 1.1 -- 6/17/05

//     This script may be used in anything you choose, including and not limited to commercial products. 
//     Just copy the MakeParticles() function; it will function without any other variables in a different script
//         ( You can, of course, rename MakeParticles() to something else, such as StartFlames() )

//    This script is basically an llParticleSystem() call with comments and formatting. Change any of the values
//    that are listed second to change that portion. Also, it is equipped with a touch-activated off button,
//    for when your particles go haywire and cause everyone to start yelling at you.

//  Contact Keknehv Psaltery if you have questions or comments.

MakeParticles()                //This is the function that actually starts the particle system.
    llParticleSystem([                   //KPSv1.0  
        PSYS_PART_FLAGS , 0 //Comment out any of the following masks to deactivate them
    //| PSYS_PART_BOUNCE_MASK           //Bounce on object's z-axis
    | PSYS_PART_WIND_MASK             //Particles are moved by wind
    | PSYS_PART_INTERP_COLOR_MASK       //Colors fade from start to end
    | PSYS_PART_INTERP_SCALE_MASK       //Scale fades from beginning to end
    | PSYS_PART_FOLLOW_SRC_MASK         //Particles follow the emitter
    | PSYS_PART_FOLLOW_VELOCITY_MASK    //Particles are created at the velocity of the emitter
    //| PSYS_PART_TARGET_POS_MASK       //Particles follow the target
    //| PSYS_PART_EMISSIVE_MASK           //Particles are self-lit (glow)
    //| PSYS_PART_TARGET_LINEAR_MASK    //Undocumented--Sends particles in straight line?
    //PSYS_SRC_TARGET_KEY , NULL_KEY,   //Key of the target for the particles to head towards
                                                //This one is particularly finicky, so be careful.
    //Choose one of these as a pattern:
    //PSYS_SRC_PATTERN_DROP                 Particles start at emitter with no velocity
    //PSYS_SRC_PATTERN_EXPLODE              Particles explode from the emitter
    //PSYS_SRC_PATTERN_ANGLE                Particles are emitted in a 2-D angle
    //PSYS_SRC_PATTERN_ANGLE_CONE           Particles are emitted in a 3-D cone
    //PSYS_SRC_PATTERN_ANGLE_CONE_EMPTY     Particles are emitted everywhere except for a 3-D cone
    ,PSYS_SRC_TEXTURE,           "2ca57748-4944-de53-b301-8d0efbafb2c6"     //UUID of the desired particle texture  
    ,PSYS_PART_MAX_AGE,          5.0                //Lifetime, in seconds, that a particle lasts
    ,PSYS_SRC_BURST_RATE,        0.05               //How long, in seconds, between each emission
    ,PSYS_SRC_BURST_PART_COUNT,  1                  //Number of particles per emission
    ,PSYS_SRC_BURST_RADIUS,      5.0                //Radius of emission
    ,PSYS_SRC_BURST_SPEED_MIN,   1.5                //Minimum speed of an emitted particle
    ,PSYS_SRC_BURST_SPEED_MAX,   2.0                //Maximum speed of an emitted particle
    ,PSYS_SRC_ACCEL,             <0.0,0.0,0.8>      //Acceleration of particles each second
    ,PSYS_PART_START_COLOR,      <0.8,0.8,0.8>      //Starting RGB color
    ,PSYS_PART_END_COLOR,        <0.2,0.2,0.2>      //Ending RGB color, if INTERP_COLOR_MASK is on 
    ,PSYS_PART_START_ALPHA,      0.9                //Starting transparency, 1 is opaque, 0 is transparent.
    ,PSYS_PART_END_ALPHA,        0.0                //Ending transparency
    ,PSYS_PART_START_SCALE,      <0.8,0.8,0.0>      //Starting particle size
    ,PSYS_PART_END_SCALE,        <4.3,4.3,0.0>      //Ending particle size, if INTERP_SCALE_MASK is on
    ,PSYS_SRC_ANGLE_BEGIN,       -.3                //Inner angle for ANGLE patterns
    ,PSYS_SRC_ANGLE_END,         .3                //Outer angle for ANGLE patterns
    ,PSYS_SRC_OMEGA,             <0.0,0.0,0.0>       //Rotation of ANGLE patterns, similar to llTargetOmega()

        MakeParticles();                //Start making particles

    touch_start( integer num )            //Turn particles off when touched
        state off;        //Switch to the off state

state off
        llParticleSystem([]);        //Stop making particles
    touch_start( integer num )        //Turn particles back on when touched
        state default;
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