Chapter_14/ParticleSystemTransformFeedback/ParticleSystemTransformFeedback.c line169

[huakaitingqian]

i can't understand the line 169,170.
the "lifetime" variable is always minus, there is no use deciding "lifetime <=0.0"
the code:

 float lifetime = a_curtime - u_time; 
 if( lifetime <= 0.0 && randomValue(seed) < u_emissionRate )
 {  
 }

i think it may be the following code, to decide whether the particle has
expired.
float lifetime = a_lifetime - (u_time - a_curtime);