Re: [pygame] particles

[Pete Shinners <pete@shinners.org>]

your performance seems a bit lower than i'd expect, i've got to get my 
pyopengl going and play with it myself. in the meantime, the bottleneck 
really looks like it's the "dead" handling section. hmmm..

   pos = self.points.coord.point
   clr = self.points.color.color

   #random value for all particles, be sure to import RandomArray
   rnd = RandomArray.random(pos.shape)

   #set "dead" to be around 1/4 of all points below floor
   dead = pos[:,1] <= 0.0 and rnd[:,0] <= 0.25

   #move dead to emitter point and reset color
   self.points.coord.point = where(dead, emitter, pos)
   self.points.color.color = where(dead, initialColor, clr)

   #set random velocities
   newvel = rnd + (-.5, .1, -.5) * (2, 20, 2)
   self.velocities = where(dead, newvel, self.velocities)


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