And did you correctly setup attenuation equation? Attenuation is controlled 
by glPointParameter function (
http://www.khronos.org/opengles/sdk/1.1/docs/man/) with pname 
GL_POINT_DISTANCE_ATTENUATION, where you suppose to provide array of 3 
floats with attenuation equation coeffs (a, b and c). 

This equation is:

1 / (1 + b * D + c * D^2)

where D is point sprite distance. Initial value for this coeffs is 1, 0, 0 - 
that is attenuation is disabled.
 

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