n_3d.h

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#ifndef _N_3D_HEADER
#define _N_3D_HEADER
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "n_log.h"
#include "n_common.h"
#include <sys/time.h>
 
#define MOVE_STOPPED 0
#define MOVE_INTER 1
#define MOVE_SIMU 2
 
#define VECTOR3D_DONT_INTERSECT -2
#define VECTOR3D_COLLINEAR -1
#define VECTOR3D_DO_INTERSECT 0
 
typedef double VECTOR3D[ 3 ];        /* x , y , z  */
 
 
#define VECTOR3D_SET( VECTOR , X , Y , Z ) \
   VECTOR[ 0 ] = (X) ; \
   VECTOR[ 1 ] = (Y) ; \
   VECTOR[ 2 ] = (Z) ;
 
typedef struct PHYSICS
{
    time_t delta_t ;
    VECTOR3D    position ;
    VECTOR3D speed ;
    VECTOR3D acceleration ;
    VECTOR3D orientation ;
    VECTOR3D angular_speed ;
    VECTOR3D angular_acceleration ;
    VECTOR3D gravity ;
    int can_jump ;
    int sz ;
    int type ;
} PHYSICS ;
 
/* distance between two points */
double distance( VECTOR3D *p1, VECTOR3D *p2 );
/* update componant[ it ] of a VECTOR3D */
int update_physics_position_nb( PHYSICS *object, int it, double delta_t );
/* update componant[ it ] of a VECTOR3D, reversed time */
int update_physics_position_reverse_nb( PHYSICS *object, int it, double delta_t );
/* update the position of an object, using the delta time T to update positions */
int update_physics_position( PHYSICS *object, double delta_t );
/* update the position of an object, using the delta time T to reverse update positions */
int update_physics_position_reverse( PHYSICS *object, double delta_t );
/* compute if two vector are colliding, storing the resulting point in px */
int vector_intersect( VECTOR3D *p0, VECTOR3D *p1, VECTOR3D *p2, VECTOR3D *p3, VECTOR3D *px );
/* dot product */
double vector_dot_product( VECTOR3D *vec1, VECTOR3D *vec2 );
/* vector normalize */
double vector_normalize( VECTOR3D *vec );
/* vector angle with other vector */
double vector_angle_between( VECTOR3D *vec1, VECTOR3D *vec2 );
 
#define copy_point( __src_ , __dst_ ) \
   memcpy( __dst_ , __src_ , sizeof( VECTOR3D ) );
 
#ifdef __cplusplus
}
#endif
 
#endif // header guard