Short Program 5: Object loaders and dumpers
Due: Friday, Sep 30 at 11:59 pm
Overview
In this assignment you will create three four new modules: object.c, sphere.c, plane.c,
and material.c. These modules will contain the following functions described below.
You must add the proper function prototypes to rayhdrs.h.
object.c:
/**/
/* Constructor for generic object type */
obj_t *object_init(
FILE *in,
int objtype);
Thes function should malloc() a new obj_t structure, set the objtype and the objid fields and
invoke material_init() to read in theambient, diffuse, and specular reflectivity of the object.
material.c
/**/
int material_init(
FILE *in,
material_t *mat);
This function should use the standard fscanf()/fgets() combination to read reflectivity and
consume descriptive text. Because this action is repeated in many contexts. I built a collection
of vl_getn() functions that will read 1, 2, or 3 values into a vector. An alternative would be to
build a single vl_get() function that could be passed the number of values it is supposed to get.
Its also OK to just do it the hard way (call fscanf()/fgets() three times). However, it is
REQUIRED that you include some mechanism for detecting defective input and aborting.
int sum = 0;
sum += vl_get3(in, mat->ambient);
sum += vl_get3(in, mat->diffuse);
sum += vl_get3(in, mat->specular);
if (sum != 9)
{
fprintf(stderr, "Matload failed with %d values \n", sum);
material_dump(stderr, mat);
return(-1);
}
