stk-code_catmod/data/gfx/gfx_mudPot_a.xml

<?xml version="1.0"?>

<!-- For sky particles, the size of the box is ignored -->
<particles emitter="box" box_x="0.01" box_y="0.5" box_z="0.01">

    <spreading angle="30"           />
    
    <velocity  x="-0.000"
               y="0.002"
               z="-0.000"             />
    
    <material  file="gfx_mud_a.png" clampu="Y" clampv="Y" />
    
    <!-- Amount of particles emitted per second -->
    <rate      min="5"
               max="8"           />
    
    <!-- Minimal and maximal lifetime of a particle, in milliseconds. -->
    <lifetime  min="900"
               max="1000"          />
    
    <!-- Size of the particles -->
    <size      min="0.3"
               max="0.5"         
               x-increase-factor="2.6"
               y-increase-factor="2.6" />
    
    <color     min="40 255 40"
               max="255 255 255"   />
 
</particles>