/*======== double get_illumination() ==========
Inputs: double *l
double *n
int cp
double *constants
Returns: illumination (0 - 255)
Sum of ambient, diffuse, and specular components of illumination
====================*/
color get_illumination(vector light, vector normal, double *cp, color ca, struct constants *cons){
color c;
double ambient, diffuse, specular;
int val;
ambient = get_ambient(ca.red, cons -> r[Ka]);
diffuse = get_diffuse(light, normal, cp[0], cons -> r[Kd]);
specular = get_specular(light, normal, cp[0], cons -> r[Ks]);
val = ambient + diffuse + specular;
c.red = val <= 255 ? val : 255;
ambient = get_ambient(ca.green, cons -> g[Ka]);
diffuse = get_diffuse(light, normal, cp[1], cons -> g[Kd]);
specular = get_specular(light, normal, cp[1], cons -> g[Ks]);
val = ambient + diffuse + specular;
c.green = val <= 255 ? val : 255;
ambient = get_ambient(ca.blue, cons -> b[Ka]);
diffuse = get_diffuse(light, normal, cp[2], cons -> b[Kd]);
specular = get_specular(light, normal, cp[2], cons -> b[Ks]);
val = ambient + diffuse + specular;
c.blue = val <= 255 ? val : 255;
if (cons -> red || cons -> green || cons -> blue){
c.red *= cons -> red;
c.green *= cons -> green;
c.blue *= cons -> blue;
}
return c;
}
vector3f get_ray_trace(ray &r, kdtree &kdtree, int depth)
{
if (depth >= max_depth)
{
return vector3f(0.0, 0.0, 0.0);
}
vector3f origin_cp = r.origin;
primitive *pri = get_intersecting_primitive(kdtree, r);
if (pri == NULL)
{
return background;
}
else
{
double *amb = pri->get_material().amb;
double *dif = pri->get_material().dif;
double *spc = pri->get_material().spc;
// ambient calculation
vector3f ambient = get_ambient(amb);
// specular calculation (no transparency)
vector3f specular = get_specular(spc, pri, r, kdtree, depth);
// diffuse calculation
double spc_alpha = 1;
vector3f diffuse = get_diffuse(dif, pri, r, kdtree, depth, spc_alpha);
return rgb_trim(ambient + specular * spc_alpha + diffuse);
}
}
static int get_spot(t_ray *ray, t_ray *light, t_spot *spot)
{
int color;
color = get_diffuse(ray, light, spot);
color = color_add(color, get_specular(ray, light, spot));
return (color);
}
