stk-code/data/gfx/gfx_firework_a.xml

<?xml version="1.0"?>

<!-- For sky particles, the size of the box is ignored -->
<particles emitter="sphere" radius="0.1">

    <spreading angle="5"           />
    
    <velocity  x="-0.000"
               y="0.002"
               z="-0.000"             />
    
    <material  file="gfx_sparkFire_a.png" clampu="Y" clampv="Y" />
    
    <!-- Amount of particles emitted per second -->
    <rate      min="20"
               max="50"           />
    
    <!-- Minimal and maximal lifetime of a particle, in milliseconds. -->
    <lifetime  min="400"
               max="500"          />
    
    <!-- Size of the particles -->
    <size      min="0.2"
               max="0.3"          />
    
    <color     min="40 255 40"
               max="255 255 255"   />

</particles>