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plane.c
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plane.c
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#include <stdio.h>
#include "plane.h"
#include "ray.h"
#include "structs.h"
#include "malloc.h"
#include "object.h"
#include "veclib.h"
#include "material.h"
#include "util.h"
/*
* plane.c - file contains functions that model a infinite plane type object
*/
/*
* plane_init - function initializes a plane object
*
* Parameters: in - pointer to a file that will be read from
* objtype - type int, signifies what type of object we are
* dealing with
*
* Return: obj_t - the object that has been initialized
*/
obj_t *plane_init(FILE *in, int objtype, float refraction_index) {
obj_t *obj = NULL;
plane_t *plane = NULL;
obj = object_init(in, objtype, refraction_index);
plane = Malloc(sizeof(plane_t));
//void pointers to functions
obj->hits = hits_plane;
obj->getamb = getamb_plane;
obj->getdiff = getdiff_plane;
obj->getspec = getspec_plane;
obj->getnorm = getnorm_plane;
obj->getloc = getloc_plane;
obj->priv = plane;
get_3_doubles(&plane->normal[0], &plane->normal[1], &plane->normal[2]);
get_3_doubles(&plane->point[0], &plane->point[1], &plane->point[2]);
plane_dump(stderr, obj);
fprintf(stderr, "plane_init() just before return\n");
return obj;
}
/*
* plane_dump - function prints out data about the plane object
*
* Parameter: out - pointer to a file we will write too
* obj - pointer to a obj_t structure that signifies the object we
* are describing
*
* Return: int - signifies success or failure
*/
int plane_dump(FILE *out, obj_t *obj) {
plane_t *plane = obj->priv;
int rc;
fprintf(out, "Dumping object of type Plane\n");
rc = material_dump(out, &obj->material); // print out reflectivities
fprintf(out, "Plane data -\n");
fprintf(out, "normal - \t%lf \t%lf \t%lf\n", plane->normal[0],
plane->normal[1], plane->normal[2]);
fprintf(out, "point - \t%lf \t%lf \t%lf\n\n", plane->point[0],
plane->point[1], plane->point[2]);
return rc;
}
/*
* hits_plane - function determines whether or not the plane object has been
* hit by an array
*
* Parameters: base - origin of the ray
* dir - direction of the ray
* obj - the object that we are checking for a hit
*
* Returns: double
*/
double hits_plane(double *base, double *dir, obj_t *obj) {
plane_t *plane = (plane_t *) obj->priv;
int i;
double NdotQ = dot3(plane->normal, plane->point);
double NdotV = dot3(plane->normal, base);
double NdotD = dot3(plane->normal, dir);
if (NdotD == 0.0) { return -1; }
double th = (NdotQ - NdotV) / (NdotD);
if (th < 0.00001) { return -1; }
double thD[3];
scale3(th, dir, thD);
double H[3];
sum(base, thD, H);
if (H[2] > 0.00001) { return -1; }
for (i = 0; i < 3; i++) {
obj->hitloc[i] = H[i];
}
return th;
}
/*
* getamb_plane
*
*/
void getamb_plane(obj_t *obj, double *intensity) {
intensity[0] += (obj->material.ambient[0]);
intensity[1] += (obj->material.ambient[1]);
intensity[2] += (obj->material.ambient[2]);
}
/*
* getdiff_plane
*
*/
void getdiff_plane(obj_t *obj, double *diffuse) {
diffuse[0] = (obj->material.diffuse[0]);
diffuse[1] = (obj->material.diffuse[1]);
diffuse[2] = (obj->material.diffuse[2]);
}
/*
* getspec_plane
*
*/
void getspec_plane(obj_t *obj, double *specular) {
specular[0] = (obj->material.specular[0]);
specular[1] = (obj->material.specular[1]);
specular[2] = (obj->material.specular[2]);
}
void getloc_plane(obj_t *obj, double *location) {
plane_t *temp = obj->priv;
location[0] = temp->point[0];
location[1] = temp->point[1];
location[2] = temp->point[2];
}
void getnorm_plane(obj_t *obj, double *norm_vec) {
plane_t *temp_plane = obj->priv;
int i;
for (i = 0; i < 3; i++) {
norm_vec[i] = temp_plane->normal[i];
}
}