int find_closest(t_data *data, const int get_normal)
{
data->closest[1] = -1;
if (get_normal == 1)
{
find_closest_sphere(data, data->viewray, &(data->t));
find_closest_plane(data, data->viewray, &(data->t));
find_closest_cone(data, data->viewray, &(data->t));
find_closest_cylinder(data, data->viewray, &(data->t));
if (data->closest[1] == -1)
return (0);
if (data->closest[0] == SPHERE)
return (sphere_normal(data));
else if (data->closest[0] == PLANE)
return (plane_normal(data));
else if (data->closest[0] == CYLINDER)
return (cylinder_normal(data));
else if (data->closest[0] == CONE)
return (cone_normal(data));
return (1);
}
return (hit_any_sphere(data, data->lightray, data->t) ||
hit_any_plane(data, data->lightray, data->t) ||
hit_any_cone(data, data->lightray, data->t) ||
hit_any_cylinder(data, data->lightray, data->t));
}
// computation of the input point/dir and output point/dir of the refractor light
bool refraction(vec3 inpoint, vec3 invector, void* obj, int isplane, bool inobj, vec3* outlightvector) {
// printf("*****");
if(isplane) return false;
// printf("not plane\n");
Spheres * sph = (Spheres *)obj;
//intermediate light
vec3 in_normal = sphere_normal(inpoint, sph);
float ratio;
if(!inobj) ratio = 1.0/sph->refractivity;
else ratio = sph->refractivity;
if(!refract_light(in_normal, invector, ratio, outlightvector)) return false;
return true;
}
RGB_float recursive_ray_trace(Vector ray, Point p, int step) {
RGB_float color = background_clr;
RGB_float reflected_color = {0,0,0};
RGB_float refracted_color = {0,0,0};
Spheres *closest_sph;
Point *hit = new Point;
closest_sph = intersect_scene(p, ray, scene, hit);
//get the point color here
//intersects a sphere
Point *plane_hit = new Point;
color = background_clr;
if(chessboard_on && intersect_plane(p, ray, N_plane, p0, plane_hit))
{
Vector eye_vec = get_vec(*plane_hit, eye_pos);
Vector light_vec = get_vec(*plane_hit, p);
normalize(&light_vec);
normalize(&eye_vec);
color = colorPlane(*plane_hit);
Vector shadow_vec = get_vec(*plane_hit, light1);
Spheres *sph = NULL;
if(inShadow(*plane_hit, shadow_vec, scene, sph) && shadow_on)
{
color = clr_scale(color, .5);
}
}
if(closest_sph != NULL)
{
Vector eye_vec = get_vec(*hit, eye_pos);
Vector surf_norm = sphere_normal(*hit, closest_sph);
Vector light_vec = get_vec(*hit, p);
normalize(&light_vec);
normalize(&surf_norm);
normalize(&eye_vec);
color = phong(*hit, eye_vec, surf_norm, closest_sph);
if(step < step_max && reflection_on)
{
Vector reflect_vec = vec_minus(vec_scale(surf_norm, vec_dot(surf_norm, light_vec)*2), light_vec);
step += 1;
normalize(&reflect_vec);
reflected_color = recursive_ray_trace(reflect_vec, *hit, step);
reflected_color = clr_scale(reflected_color, closest_sph->reflectance);
color = clr_add(color, reflected_color);
}
if(step < step_max && refraction_on)
{
Vector refracted_ray = getRefractedRay(1.51, closest_sph, surf_norm, light_vec);
step += 1;
normalize(&refracted_ray);
refracted_ray.x = hit->x + refracted_ray.x;
refracted_ray.y = hit->x + refracted_ray.y;
refracted_ray.z = hit->x + refracted_ray.z;
refracted_color = recursive_ray_trace(refracted_ray, *hit, step);
color = clr_add(color, reflected_color);
}
return color;
}
else
{
return color;
}
}
/************************************************************************
* This is the recursive ray tracer - you need to implement this!
* You should decide what arguments to use.
************************************************************************/
vec3 recursive_ray_trace(vec3 eye, vec3 ray, int num, bool inobj) {
//
// do your thing here
//
if(num>step_max) return null_clr;
vec3 hit;
int isplane;
void *sph = intersect_scene(eye, ray, scene, &hit, &isplane);
vec3 color = null_clr;
if(sph==NULL) {
return background_clr;
}
vec3 lightvec = light1 - hit;
vec3 lightvec_normal = normalize(lightvec);
vec3 lighthit;
int lightisplane;
void * light_sph = intersect_scene(hit, lightvec_normal, scene, &lighthit, &lightisplane);
vec3 surf_normal = isplane?vec3(0,1,0):sphere_normal(hit, (Spheres*)sph);
if(light_sph==NULL) {
color += phong(-1*ray, lightvec, surf_normal, sph, hit, isplane);
}
else {
if(!shadow_on) {
color += phong(-1*ray, lightvec, surf_normal, sph, hit, isplane);
}
else {
color += get_shadow(-1*ray, lightvec, surf_normal, sph, hit, isplane);
}
}
if(reflect_on) {
vec3 reflect_vector = 2*dot(-1*ray, surf_normal)*surf_normal + ray;
reflect_vector = normalize(reflect_vector);
if(isplane) {
color += ((struct plane*)sph)->reflectance * recursive_ray_trace(hit, reflect_vector,num+1, inobj);
}
else if(!isplane)
color += ((Spheres *)sph)->reflectance * recursive_ray_trace(hit, reflect_vector, num+1, inobj);
}
if(refract_on) {
vec3 outlightvector;
if(refraction(hit, -1*ray, sph, isplane, inobj, &outlightvector)) {
if(!isplane) {
// printf("refraction point\n");
Spheres * refractsph = (Spheres *)sph;
color += refractsph->refr*recursive_ray_trace(hit, outlightvector, num+1, !inobj);
}
}
}
if(diffuse_reflection_on && num<2) {
int i;
for (i=0;i<DIFFUSE_REFLECTION;i++) {
float xtheta = 2.0 * static_cast <float> (rand()) / static_cast <float> (RAND_MAX) - 1.0;
float ytheta = 2.0 * static_cast <float> (rand()) / static_cast <float> (RAND_MAX) - 1.0;
float ztheta = 2.0 * static_cast <float> (rand()) / static_cast <float> (RAND_MAX) - 1.0;
vec3 dfray;
dfray = rotateX(xtheta*M_PI,surf_normal);
dfray = rotateY(ytheta*M_PI,dfray);
dfray = rotateZ(ztheta*M_PI,dfray);
color += (0.1/DIFFUSE_REFLECTION)*recursive_ray_trace(hit, dfray, num+1, inobj);
}
}
return color;
}