Surprisingly, I am unable to make wind and gravity work in Rune's 
particle system. I read and re-read the doc and I seem to follow the 
rules. These are the corresponding lines of code (see also the image in 
p.b.i.):

    #declare particle_drag      = 10;
    #declare particle_transfer  = 1.0;

    #macro particle_gravity  (Clock,Point) <0,-1,0> #end
    #macro particle_wind     (Clock,Point) <10*Clock, 0, 0> #end

So, if Rune, or anybody familiar with the macros can help me, I shall be 
most grateful.

Thomas

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