The following script can be used to create a brazier that will light up whenever an avatar is detected in the proximity (10 meters range).

Smoke	Flame

The textures above are referenced in the script as "Flame" and "Smoke".

proximity_brazier.lsl

///////////////////////////////////////////////////////////////////////////
//  Copyright (C) Wizardry and Steamworks 2013 - License: GNU GPLv3      //
//  Please see: http://www.gnu.org/licenses/gpl.html for legal details,  //
//  rights of fair usage, the disclaimer and warranty conditions.        //
///////////////////////////////////////////////////////////////////////////
 
default
{
    state_entry() {
        llSensorRepeat("", "", AGENT, 10, TWO_PI, 1);
    }
    sensor(integer num) {
        float d = llFabs(llVecDist(llDetectedPos(0),llGetPos()));
        llParticleSystem([0,295,PSYS_PART_MAX_AGE,3.800000,PSYS_PART_START_COLOR,<1,.98431,.04706>,3,<.98431,.00000,.00000>,PSYS_PART_START_SCALE,<.20213,.20213,.20213>,6,<.27788,.59734,2.66495>/d,PSYS_SRC_PATTERN,2,13,.050000,8,<.00000,.00000,.10000>,PSYS_SRC_BURST_PART_COUNT,10,16,.350000,PSYS_SRC_BURST_SPEED_MIN,.100000,18,.100000,20,llGetKey(),22,1,PSYS_SRC_ANGLE_END,1,PSYS_SRC_OMEGA,<.00000,.00000,.00000>,PSYS_SRC_TEXTURE,"Flame",PSYS_SRC_MAX_AGE,.000000,2,.501961,PSYS_PART_END_ALPHA,.098039]);
        llSetPrimitiveParams([PRIM_POINT_LIGHT, TRUE, <1,.5,0>, 2 / d, 10, .75]);
    }
    no_sensor() {
        llParticleSystem([0,1|PSYS_PART_INTERP_SCALE_MASK|PSYS_PART_EMISSIVE_MASK,PSYS_SRC_PATTERN,4,PSYS_PART_START_COLOR,<1,1,1>,3,<.8,.8,.8>,2,.3,PSYS_PART_END_ALPHA,.0,PSYS_PART_START_SCALE,<.025,.035,.0>,6,<1,1.125,.0>,PSYS_PART_MAX_AGE,30.0,8,<.0,.0,.01>,PSYS_SRC_TEXTURE,"Smoke",13,.75,22,3.141593,PSYS_SRC_ANGLE_END,(3.141593-.1),PSYS_SRC_BURST_PART_COUNT,1,16,.01,PSYS_SRC_BURST_SPEED_MIN,.0,18,.01,PSYS_SRC_OMEGA,<.3,.3,0>]);
        llSetPrimitiveParams([PRIM_POINT_LIGHT, FALSE, <1,.5,0>, 1, 10, .75]);
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        llResetScript();
    }
}