Function frand

cpp/5_Domain_Specific/smokeParticles/ParticleSystem.cpp:160–160

random float [0, 1]

// random float [0, 1]
inline float frand() { return rand() / (float)RAND_MAX; }

// signed random float [-1, 1]
inline float sfrand() { return frand() * 2.0f - 1.0f; }