43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
#include "math.h"
|
|
#include "object.h"
|
|
#include <cglm/cglm.h>
|
|
|
|
float frand48(void) {
|
|
float number = (float) rand() / (float) (RAND_MAX + 1.0);
|
|
float side = rand() % 2;
|
|
if (side == 0) {
|
|
number = -number;
|
|
}
|
|
|
|
return number;
|
|
}
|
|
|
|
void calculate_gravity(struct object *src, struct object *target, vec3 force) {
|
|
vec4 tmp;
|
|
glm_vec4_sub(target->position, src->position, tmp);
|
|
|
|
vec3 distance;
|
|
glm_vec3(tmp, distance);
|
|
|
|
float distance_xy = sqrt((distance[0] * distance[0]) + (distance[1] * distance[1]));
|
|
float distance_xyz = sqrt((distance_xy * distance_xy) + (distance[2] * distance[2]));
|
|
float force_scale = 4.0f;
|
|
|
|
float g = 6.67f * 1e-11f;
|
|
float top = g * src->mass * target->mass;
|
|
|
|
for (int i = 0; i < 3; i++) {
|
|
distance[i] = (distance[i] * distance[i] * distance[i]);
|
|
}
|
|
|
|
for (int i = 0; i < 3; i++) {
|
|
if (distance[i] == 0) {
|
|
force[i] = 0.0f;
|
|
continue;
|
|
}
|
|
|
|
force[i] = (top / (distance_xyz / (target->position[i] - src->position[i]))) * force_scale;
|
|
}
|
|
}
|
|
|