def newVelocity(self, n):
"""Generate a new random velocity by blending the given direction with a random unit vector,
normalizing it, then multiplying by a randomly generated speed.
"""
randomDirections = Noise.randomVectors((n, 3), type=Float32)
randomDirections *= self._directionRandomness
randomDirections += self.premultDirection
normalize(randomDirections, randomDirections)
randomSpeeds = repeat(Noise.randomArray((n, 1), type=Float32, range=self.speedRange), 3, -1)
randomDirections *= randomSpeeds
return randomDirections
def __init__(self, size=(256,256), seed=None):
Texture.Texture.__init__(self)
r = Noise.randomArray(size, seed, (0,255), UInt8)
self.loadRaw(size, r.tostring(), GL_LUMINANCE, 1)
self.setFilter(GL_NEAREST, GL_NEAREST)