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Deterministic random numbers for the transonic instability calculation

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ulteq 2015-05-03 11:46:30 +02:00
parent 4d4604da28
commit e5a81bfe37
1 changed files with 27 additions and 7 deletions
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34
extensions/advanced_ballistics/AdvancedBallistics.cpp
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@ -1,9 +1,9 @@
#include "ace_common.h"
#include <time.h>
#include <string>
#include <vector>
#include <map>
#include <random>
#define M_PI 3.14159265358979323846f
#define GRAVITY 9.80665f
@ -44,6 +44,8 @@ struct Bullet {
double lastFrame;
double hDeflection;
double spinDrift;
unsigned randSeed;
std::default_random_engine randGenerator;
};
struct Map {
@ -372,6 +374,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
bulletDatabase[index].spinDrift = 0.0;
bulletDatabase[index].speed = 0.0;
bulletDatabase[index].frames = 0.0;
bulletDatabase[index].randSeed = 0;
int n = sprintf_s(output, outputSize, "%s", "");
return;
@ -411,6 +414,22 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
tickTime = strtod(strtok_s(NULL, ":", &next_token), NULL);
tickTime += strtod(strtok_s(NULL, ":", &next_token), NULL);
if (bulletDatabase[index].randSeed == 0) {
int angle = (int)round(atan2(velocity[0], velocity[1]) * 360 / M_PI);
bulletDatabase[index].randSeed = (unsigned)(720 + angle) % 720;
bulletDatabase[index].randSeed *= 3;
bulletDatabase[index].randSeed += (unsigned)round(abs(velocity[2]) / 2);
bulletDatabase[index].randSeed *= 3;
bulletDatabase[index].randSeed += (unsigned)round(abs(bulletDatabase[index].origin[0] / 2));
bulletDatabase[index].randSeed *= 3;
bulletDatabase[index].randSeed += (unsigned)round(abs(bulletDatabase[index].origin[1] / 2));
bulletDatabase[index].randSeed *= 3;
bulletDatabase[index].randSeed += (unsigned)abs(bulletDatabase[index].temperature) * 10;
bulletDatabase[index].randSeed *= 3;
bulletDatabase[index].randSeed += (unsigned)abs(bulletDatabase[index].humidity) * 10;
bulletDatabase[index].randGenerator.seed(bulletDatabase[index].randSeed);
}
double ballisticCoefficient = 1.0;
double dragRef = 0.0;
double drag = 0.0;
@ -572,12 +591,13 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
positionOffset[0] += sin(bulletDir + M_PI / 2) * spinDriftPartial;
positionOffset[1] += cos(bulletDir + M_PI / 2) * spinDriftPartial;
if (bulletSpeed < 345 && bulletSpeedAvg > 340 && bulletSpeed > 335)
{
srand((unsigned)time(NULL));
velocityOffset[0] += (((double)rand() / (RAND_MAX)) * 0.4 - 0.2) * (1 - bulletDatabase[index].transonicStabilityCoef);
velocityOffset[1] += (((double)rand() / (RAND_MAX)) * 0.4 - 0.2) * (1 - bulletDatabase[index].transonicStabilityCoef);
velocityOffset[2] += (((double)rand() / (RAND_MAX)) * 0.4 - 0.2) * (1 - bulletDatabase[index].transonicStabilityCoef);
if (bulletSpeed < 345 && bulletSpeedAvg > 340 && bulletSpeed > 335) {
std::uniform_real_distribution<double> distribution(0.0, 1.0);
double coef = 1.0f - bulletDatabase[index].transonicStabilityCoef;
velocityOffset[0] += (distribution(bulletDatabase[index].randGenerator) * 0.8 - 0.4) * coef;
velocityOffset[1] += (distribution(bulletDatabase[index].randGenerator) * 0.8 - 0.4) * coef;
velocityOffset[2] += (distribution(bulletDatabase[index].randGenerator) * 0.8 - 0.4) * coef;
};
int n = sprintf_s(output, outputSize, "_bullet setVelocity (_bulletVelocity vectorAdd [%f, %f, %f]); _bullet setPosASL (_bulletPosition vectorAdd [%f, %f, %f]);", velocityOffset[0], velocityOffset[1], velocityOffset[2], positionOffset[0], positionOffset[1], positionOffset[2]);