www.pudn.com > LightTrack.rar > Track.h
#if defined(_CI_)
#error Cannot use _CI_ for ray tracing.
#endif
#if !defined(_TRACE_H_)
#define _TRACE_H_
/** 3DGPL *************************************************\
* (RGB hardware) *
* Header for the 3D ray tracing engine. *
* *
* Ifdefs: *
* _RGB_ Colour/Intensity model. *
* *
* Files: *
* track.c Ray tracing engine. *
* *
* (c) 1995-98 Sergei Savchenko, (savs@cs.mcgill.ca) *
\**********************************************************/
#include "Vector.h" /* V_LNG_VECTOR */
/**********************************************************\
* Material. Contains reflection coeficients. *
* *
* +--------------------+ *
* | +---+---+---+ *
* | tr_ambient | R | G | B | *
* | +---+---+---+ *
* | | *
* | +---+---+---+ *
* | tr_diffuse | R | G | B | *
* | +---+---+---+ *
* | | *
* | tr_specular | *
* | tr_exponent | *
* | tr_reflect | *
* +--------------------+ *
* *
\**********************************************************/
struct TR_matter
{
//环境反射，RGB矢量
float tr_ambient[V_LNG_VECTOR]; /* coefs of ambient reflection */
//漫反射，RGB矢量
float tr_diffuse[V_LNG_VECTOR]; /* coefs of diffuse reflection */
//镜面反射
float tr_specular; /* coef of specular reflection */
//镜面反射系数
float tr_exponent; /* specular exponent */
//递归光线
float tr_reflect; /* recursive ray */
};
/**********************************************************\
* Light source. Represents a point light equal into all *
* directions. *
* *
* +--------------------+ *
* | +---+---+---+ *
* | tr_centre | X | Y | Z | *
* | +---+---+---+ *
* | | *
* | +---+---+---+ *
* | tr_intensity | R | G | B | *
* | +---+---+---+ *
* +--------------------+ *
* *
\**********************************************************/
struct TR_point_light
{
float tr_centre[V_LNG_VECTOR]; /* point light source */
float tr_intensity[V_LNG_VECTOR];
};
/**********************************************************\
* Ray. Represented through origine and direction vector. *
* *
* +--------------------+ *
* | +---+---+---+ *
* | tr_start | X | Y | Z | *
* | +---+---+---+ *
* | | *
* | +---+---+---+ *
* | tr_codirected | X | Y | Z | *
* | +---+---+---+ *
* +--------------------+ *
* *
\**********************************************************/
struct TR_ray
{
float tr_start[V_LNG_VECTOR]; /* origin of the ray */
float tr_codirected[V_LNG_VECTOR]; /* a co-directed vector */
};
/**********************************************************\
* Sphere. Represented through centre and radius. *
* *
* +--------------------+ *
* | tr_type | TR_SPHERE *
* | +-------------+ *
* | tr_material | TR_material | *
* | +-------------+ *
* | | *
* | +---+---+---+ *
* | tr_centre | X | Y | Z | *
* | +---+---+---+ *
* | tr_radius | *
* +--------------------+ *
* *
\**********************************************************/
#define TR_SPHERE 0x1
struct TR_generic_object /* for storage in the world */
{
int tr_type;
struct TR_matter tr_material; /* material it is made of */
};
struct TR_sphere
{
int tr_type; /* TR_SPHERE */
struct TR_matter tr_material; /* material it is made of */
float tr_centre[V_LNG_VECTOR]; /* sphere's centre */
float tr_radius;
};
void TR_sphere_init(struct TR_sphere *s);
float TR_sphere_intersect(struct TR_ray *r,struct TR_sphere *s);
float *TR_sphere_normal(float *normal,float *where,
struct TR_sphere *s
);
/**********************************************************\
* Polygon. Represented through its vertex set. *
* *
* +--------------------+ *
* | tr_type | TR_POLYGON *
* | +-------------+ *
* | tr_material | TR_material | *
* | +-------------+ *
* | | *
* | +---+---+---+ *
* | tr_normal | X | Y | Z | *
* | +---+---+---+ *
* | | *
* | | +---+---+---+---+ *
* | tr_edges ------------------->| A | B | C | D | *
* | | +---+---+---+---+ *
* | | | ... | *
* | | +---------------+ *
* | | *
* | tr_no_vertices | +---+---+---+ *
* | tr_vertices ---------------->| X | Y | Z | *
* | | +---+---+---+ *
* | | | ... | *
* +--------------------+ +-----------+ *
* *
\**********************************************************/
#define TR_POLYGON 0x2
struct TR_polygon
{
int tr_type;
//多边形的材质
struct TR_matter tr_material; /* material it is made of */
float tr_normal[V_LNG_VECTOR];
//多边形的边链表
float *tr_edges; /* for intersection calcs */
//起始点和中止点重合，多边形的节点总数
int tr_no_vertices; /* first vertex equals last */
//多边形的节点链表
float *tr_vertices;
};
void TR_polygon_init(struct TR_polygon *p);
float TR_polygon_intersect(struct TR_ray *r,struct TR_polygon *p);
float *TR_polygon_normal(float *normal,float *where,
struct TR_polygon *p
);
/**********************************************************\
* World. A set of objects, a set of lights and a viewer. *
* The latter always views along Z axis. *
* *
* +--------------------+ *
* | +---+---+---+ *
* | tr_viewer | X | Y | Z | *
* | +---+---+---+ *
* | | *
* | +---+---+---+ *
* | tr_ambient | R | G | B | *
* | +---+---+---+ *
* | tr_no_point_lights | *
* | | +---+---+-- ----+ *
* | tr_point_lights -------->| O | O | ... | *
* | | +-|-+-|-+- -----+ *
* | | V V *
* | +----------------+ +----------------+ *
* | | TR_point_light | | TR_point_light | *
* | +----------------+ +----------------+ *
* | tr_no_objects | *
* | | +---+---+-- ----+ *
* | tr_object -------------->| O | O | ... | *
* | | +-|-+-|-+- -----+ *
* +--------------------+ V V *
* +-----------+ +-----------+ *
* | TR_object | | TR-object | *
* +-----------+ +-----------+ *
\**********************************************************/
#define TR_MAX_POINT_LIGHTS 10
#define TR_MAX_SPHERES 10
struct TR_world
{
float tr_ambient[V_LNG_VECTOR]; /* illumination of the world */
int tr_no_point_lights;
struct TR_point_light **tr_point_lights;
int tr_no_objects; /* number of objects */
struct TR_generic_object **tr_objects;
};
#define TR_AMBIENT 0x1 /* only ambient illumination */
#define TR_DIFFUSE 0x2 /* only diffuse illumination */
#define TR_SPECULAR 0x4 /* plus all of the above */
#define TR_SHADOW 0x8 /* shoot shadow rays */
#define TR_REFLECT 0x10 /* shoot reflection rays */
void TR_init_rendering(int type);
void TR_set_camera(float viewer_x,float viewer_y,float viewer_z,
float screen_x,float screen_y,float screen_z,
float screen_ux,float screen_uy,float screen_uz,
float screen_vx,float screen_vy,float screen_vz
);
void TR_init_world(struct TR_world *w);
void TR_trace_world(struct TR_world *w,int depth);
/**********************************************************/
#endif