PHYSICS: simple 3D movement simulation

Data Structures
struct	PHYSICS
	structure of the physics of an object More...

Macros
#define	copy_point(__src_, __dst_)    memcpy(__dst_, __src_, sizeof(VECTOR3D));
	VECTOR3D copy wrapper.
#define	MOVE_INTER   1
	PHYSICS object state for move interpolated between two position.
#define	MOVE_SIMU   2
	PHYSICS object state for move simulated from latest update.
#define	MOVE_STOPPED   0
	PHYSICS object state for STOPPED.
#define	VECTOR3D_COLLINEAR   -1
	value when the two VECTOR3D are collinear
#define	VECTOR3D_DO_INTERSECT   0
	value when the two VECTOR3D are intersecting
#define	VECTOR3D_DONT_INTERSECT   -2
	value when the two VECTOR3D are not connected
#define	VECTOR3D_SET(VECTOR, X, Y, Z)
	helper to set a VECTOR3D position

Typedefs
typedef double	VECTOR3D[3]
	struct of a point

Functions
double	distance (VECTOR3D *p1, VECTOR3D *p2)
	distance between two points
int	update_physics_position (PHYSICS *object, double delta_t)
	update the position of an object, using the delta time T to update positions
int	update_physics_position_nb (PHYSICS *object, int it, double delta_t)
	update component[ it ] of a VECTOR3D
int	update_physics_position_reverse (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_nb (PHYSICS *object, int it, double delta_t)
	update component[ it ] of a VECTOR3D, reversed time
double	vector_angle_between (VECTOR3D *vec1, VECTOR3D *vec2)
	vector angle with other vector
double	vector_dot_product (VECTOR3D *vec1, VECTOR3D *vec2)
	dot product
int	vector_intersect (VECTOR3D *p0, VECTOR3D *p1, VECTOR3D *p2, VECTOR3D *p3, VECTOR3D *px)
	compute if two vector are colliding, storing the resulting point in px
double	vector_normalize (VECTOR3D *vec)
	vector normalize

Detailed Description

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Data Structure Documentation

PHYSICS

struct PHYSICS

structure of the physics of an object

Examples

ex_gui_particles.c, ex_iso_astar.c, and ex_trajectory.c.

Definition at line 69 of file n_3d.h.

Collaboration diagram for PHYSICS:

Data Fields
VECTOR3D	acceleration	ax,ay,az actual acceleration
VECTOR3D	angular_acceleration	rax,ray,raz actual angular acceleration
VECTOR3D	angular_speed	rvx,rvy,rvz actual angular speed
int	can_jump	ability
time_t	delta_t	last delta_t used
VECTOR3D	gravity	gx , gy , gz gravity
VECTOR3D	orientation	ax,ay,az actual rotation position
VECTOR3D	position	x,y,z actual position
VECTOR3D	speed	vx,vy,vz actual speed
int	sz	size
int	type	optionnal type id

Macro Definition Documentation

copy_point

#define copy_point	(		__src_,
			__dst_
	)		memcpy(__dst_, __src_, sizeof(VECTOR3D));

VECTOR3D copy wrapper.

Definition at line 114 of file n_3d.h.

MOVE_INTER

#define MOVE_INTER   1

PHYSICS object state for move interpolated between two position.

Definition at line 46 of file n_3d.h.

MOVE_SIMU

#define MOVE_SIMU   2

PHYSICS object state for move simulated from latest update.

Definition at line 48 of file n_3d.h.

MOVE_STOPPED

#define MOVE_STOPPED   0

PHYSICS object state for STOPPED.

Definition at line 44 of file n_3d.h.

VECTOR3D_COLLINEAR

#define VECTOR3D_COLLINEAR   -1

value when the two VECTOR3D are collinear

Definition at line 53 of file n_3d.h.

VECTOR3D_DO_INTERSECT

#define VECTOR3D_DO_INTERSECT   0

value when the two VECTOR3D are intersecting

Definition at line 55 of file n_3d.h.

VECTOR3D_DONT_INTERSECT

#define VECTOR3D_DONT_INTERSECT   -2

value when the two VECTOR3D are not connected

Definition at line 51 of file n_3d.h.

VECTOR3D_SET

#define VECTOR3D_SET	(		VECTOR,
			X,
			Y,
			Z
	)

Value:

    do {                              \
        VECTOR[0] = (X);              \
        VECTOR[1] = (Y);              \
        VECTOR[2] = (Z);              \
    } while (0)

helper to set a VECTOR3D position

Examples

ex_gui_particles.c, and ex_trajectory.c.

Definition at line 61 of file n_3d.h.

Typedef Documentation

VECTOR3D

typedef double VECTOR3D[3]

struct of a point

Examples

ex_iso_astar.c, and ex_trajectory.c.

Definition at line 58 of file n_3d.h.

Function Documentation

distance()

double distance	(	VECTOR3D *	p1,
		VECTOR3D *	p2
	)

distance between two points

distance between two points

Parameters

p1	The first point
p2	The second point

Returns

The computed distance

Definition at line 36 of file n_3d.c.

update_physics_position()

int update_physics_position	(	PHYSICS *	object,
		double	delta_t
	)

update the position of an object, using the delta time T to update positions

update the position of an object, using the delta time T to update positions

Wrapper of update_physics_position_nb to update each component.

Parameters

object	The object physics to update
delta_t	Elapsed time since last call for component update computing

Returns

TRUE or FALSE

Definition at line 105 of file n_3d.c.

References __n_assert, and update_physics_position_nb().

Referenced by manage_particle_ex().

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update_physics_position_nb()

int update_physics_position_nb	(	PHYSICS *	object,
		int	it,
		double	delta_t
	)

update component[ it ] of a VECTOR3D

update component[ it ] of a VECTOR3D

Parameters

object	The object physics to update
it	component of VECTOR3D to update. it values : 0 -> x, 1 -> y , 2 -> z
delta_t	Elapsed time since last call for component update computing

Returns

TRUE or FALSE

Definition at line 49 of file n_3d.c.

References __n_assert, and acceleration.

Referenced by update_physics_position(), and update_physics_position_reverse().

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update_physics_position_reverse()

int update_physics_position_reverse	(	PHYSICS *	object,
		double	delta_t
	)

update the position of an object, using the delta time T to reverse update positions

update the position of an object, using the delta time T to reverse update positions

Wrapper of update_physics_position_reverse_nb to update each component.

Parameters

object	The object physics to update
delta_t	Elapsed time since last call for component update computing

Returns

TRUE or FALSE

Definition at line 83 of file n_3d.c.

References __n_assert, and update_physics_position_nb().

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update_physics_position_reverse_nb()

int update_physics_position_reverse_nb	(	PHYSICS *	object,
		int	it,
		double	delta_t
	)

update component[ it ] of a VECTOR3D, reversed time

update component[ it ] of a VECTOR3D, reversed time

Parameters

object	The object physics to update
it	component of VECTOR3D to update. it values : 0 -> x, 1 -> y , 2 -> z
delta_t	Elapsed time since last call for component update computing

Returns

TRUE or FALSE

Definition at line 67 of file n_3d.c.

References __n_assert, and acceleration.

vector_angle_between()

double vector_angle_between	(	VECTOR3D *	vec1,
		VECTOR3D *	vec2
	)

vector angle with other vector

vector angle with other vector

Parameters

vec1	first VECTOR3D
vec2	second VECTOR3D

Returns

angle between vectors in rad (todeg = returnval * 180/PI_2)

Definition at line 233 of file n_3d.c.

References vector_dot_product(), and vector_normalize().

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vector_dot_product()

double vector_dot_product	(	VECTOR3D *	vec1,
		VECTOR3D *	vec2
	)

dot product

dot product

Parameters

vec1	first VECTOR3D
vec2	second VECTOR3D

Returns

dot product value

Definition at line 210 of file n_3d.c.

Referenced by vector_angle_between().

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vector_intersect()

int vector_intersect	(	VECTOR3D *	p1,
		VECTOR3D *	p2,
		VECTOR3D *	p3,
		VECTOR3D *	p4,
		VECTOR3D *	px
	)

compute if two vector are colliding, storing the resulting point in px

compute if two vector are colliding, storing the resulting point in px

Parameters

p1	First point of vector 1
p2	Second point of vector 1
p3	First point of vector 2
p4	Second point of vector 2
px	Storage for the eventual point

Returns

VECTOR3D_DONT_INTERSECT , VECTOR3D_COLLINEAR or VECTOR3D_DO_INTERSECT

Definition at line 133 of file n_3d.c.

References same_sign(), VECTOR3D_COLLINEAR, VECTOR3D_DO_INTERSECT, and VECTOR3D_DONT_INTERSECT.

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vector_normalize()

double vector_normalize

(

VECTOR3D *

vec

)

vector normalize

vector normalize

Parameters

vec	VECTOR3D to normalize

Returns

normalized value of vec

Definition at line 219 of file n_3d.c.

Referenced by vector_angle_between().

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