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Add clamping of the maximum number of particles per frame to avoid too many particles being introduced at once when the particle system comes back on screen.

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Robert Osfield 2010-09-17 15:39:53 +00:00
parent 4d31f983f3
commit fc82c9cde8
1 changed files with 13 additions and 2 deletions
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13
include/osgParticle/RandomRateCounter
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@ -53,9 +53,20 @@ namespace osgParticle
inline int RandomRateCounter::numParticlesToCreate(double dt) const inline int RandomRateCounter::numParticlesToCreate(double dt) const
{ {
_np += dt * getRateRange().get_random(); // compute the number of new particles, clamping it to 1 second of particles at the maximum rate
float numNewParticles = std::min(static_cast<float>(dt * getRateRange().get_random()), getRateRange().maximum);
// add the number of new particles to value carried over from the previous call
_np += numNewParticles;
// round down the number of particles.
int n = static_cast<int>(_np); int n = static_cast<int>(_np);
// take away the number of rounded number of particles leaving the decimal place
// this is done so that two frames of 0.5's will results in first frame 0 new particles, second frame 1
_np -= n; _np -= n;
// return the rounded number of particles to be created
return n; return n;
} }