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Fixed random seed when run in benchmark mode, use default random engine instead of fixed mersene twister

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Refs #269
This commit is contained in:
saschawillems 2018-01-18 21:31:19 +01:00
parent 5790f30c17
commit 9e073bdd3b
11 changed files with 55 additions and 60 deletions
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8
examples/computenbody/computenbody.cpp
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@ -289,7 +289,7 @@ public:
// Initial particle positions
std::vector<Particle> particleBuffer(numParticles);
std::mt19937 rndGen(static_cast<uint32_t>(time(0)));
std::default_random_engine rndEngine(benchmark.active ? 0 : (unsigned)time(nullptr));
std::normal_distribution<float> rndDist(0.0f, 1.0f);
for (uint32_t i = 0; i < static_cast<uint32_t>(attractors.size()); i++)
@ -307,15 +307,15 @@ public:
else
{
// Position
glm::vec3 position(attractors[i] + glm::vec3(rndDist(rndGen), rndDist(rndGen), rndDist(rndGen)) * 0.75f);
glm::vec3 position(attractors[i] + glm::vec3(rndDist(rndEngine), rndDist(rndEngine), rndDist(rndEngine)) * 0.75f);
float len = glm::length(glm::normalize(position - attractors[i]));
position.y *= 2.0f - (len * len);
// Velocity
glm::vec3 angular = glm::vec3(0.5f, 1.5f, 0.5f) * (((i % 2) == 0) ? 1.0f : -1.0f);
glm::vec3 velocity = glm::cross((position - attractors[i]), angular) + glm::vec3(rndDist(rndGen), rndDist(rndGen), rndDist(rndGen) * 0.025f);
glm::vec3 velocity = glm::cross((position - attractors[i]), angular) + glm::vec3(rndDist(rndEngine), rndDist(rndEngine), rndDist(rndEngine) * 0.025f);
float mass = (rndDist(rndGen) * 0.5f + 0.5f) * 75.0f;
float mass = (rndDist(rndEngine) * 0.5f + 0.5f) * 75.0f;
particle.pos = glm::vec4(position, mass);
particle.vel = glm::vec4(velocity, 0.0f);
}