stk-code_catmod/data/gfx/black_smoke.xml

<?xml version="1.0"?>
<particles emitter="point">

    <spreading angle="10"        />
    
    <velocity  x="0.0"
               y="0.003"
               z="0.0"           />
    
    <material  file="smoke_black.png"  />
    
    <!-- Amount of particles emitted per second -->
    <rate      min="7"
               max="12"          />
    
    <!-- Minimal and maximal lifetime of a particle, in milliseconds. -->
    <lifetime  min="2500"
               max="5000"        />
    
    <!-- Size of the particles -->
    <size      min="1.6"
               max="2.5"
               x-increase-factor="2.6"
               y-increase-factor="2.6"         />

    <color     min="50 50 50"
               max="100 100 100" />

</particles>