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struct object {
enum { Cone, Cube, Cylinder, Plane, Sphere,
Union, Intersection, Difference } kind;
/* For base objects: Cone, Cube, Cylinder, Plane, Sphere */
struct closure surf; /* surface function */
struct matrix * world2obj, * obj2world;
flt max_scale_applied;
/* For compound objects: Union, Intersection, Difference */
struct object * o1, * o2;
/* For all objects: bounding sphere (center and radius) */
struct point center;
flt radius;
};
struct object * cone(struct closure c);
struct object * cube(struct closure c);
struct object * cylinder(struct closure c);
struct object * plane(struct closure c);
struct object * sphere(struct closure c);
struct object * orotatex(struct object * o1, flt a);
struct object * orotatey(struct object * o1, flt a);
struct object * orotatez(struct object * o1, flt a);
struct object * oscale(struct object * o1, flt sx, flt sy, flt sz);
struct object * otranslate(struct object * o1,
flt tx, flt ty, flt tz);
struct object * ouscale(struct object * o1, flt s);
struct object * odifference(struct object * o1, struct object * o2);
struct object * ointersect(struct object * o1, struct object * o2);
struct object * ounion(struct object * o1, struct object * o2);
void normal_vector(struct object * obj, struct point * p, int face,
/*out*/ struct vector * n);
#define BS_NOT_COMPUTED (-1.0)
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