#include <math.h>
#include <stdlib.h>

#if defined(__BORLANDC__) || defined(_MSC_VER)
	#define EXPORT __declspec (dllexport)
#else
	#define EXPORT extern
#endif

#ifdef __cplusplus
extern "C" {
#endif


void *implicitInit(int frame,float *bmin,float *bmax);
float implicitEval(float *dF,void *data,const float *point,float rayTime);
void implicitEvalNormal(float *dF,void *data,const float *point,float rayTime);
void implicitTini(void *data);


EXTERN void *implicitInit(int frame,float *bmin,float *bmax){
	bmin[0] = -5.5; bmin[1] = -5.5; bmin[2] = -5.5;
	bmax[0] = 5.5; bmax[1] = 5.5; bmax[2] = 5.5;
	return malloc(sizeof(int));
}

EXTERN float implicitEval(float *dF,void *data,const float *point,float rayTime){
	float d = sqrt(point[0]*point[0] + point[1]*point[1] + point[2]*point[2])-5;
	dF[0] = point[0] / d; dF[1] = point[1] / d; dF[2] = point[2] / d;
	return d;
}

/* -- Note: You don't have to provide this one -- */

/* 
EXTERN void implicitEvalNormal(float *dF,void *data,const float *point,float rayTime){
	float d = sqrt(point[0]*point[0] + point[1]*point[1] + point[2]*point[2])-5;
	dF[0] = point[0] / d; dF[1] = point[1] / d; dF[2] = point[2] / d;
}
*/

EXTERN void implicitTini(void *data){
	free(data);
}


#ifdef __cplusplus
};
#endif