jmgorius/raytracing-in-one-weekend
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Add an empty Cornell box

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This commit is contained in:
Jean-Michel Gorius 2022-11-13 18:04:49 +01:00
parent baa67b51db
commit 990b9d3016
3 changed files with 181 additions and 8 deletions
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110
hittable.c
View File

@ -133,6 +133,34 @@ Hittable *hittable_create_xy_rectangle(double x0, double x1, double y0,
return result;
}
Hittable *hittable_create_xz_rectangle(double x0, double x1, double z0,
double z1, double k,
const Material *material, Arena *arena) {
Hittable *result = arena_alloc(arena, sizeof(Hittable));
result->type = HITTABLE_XZ_RECTANGLE;
result->xz_rectangle.x0 = x0;
result->xz_rectangle.x1 = x1;
result->xz_rectangle.z0 = z0;
result->xz_rectangle.z1 = z1;
result->xz_rectangle.k = k;
result->xz_rectangle.material = material;
return result;
}
Hittable *hittable_create_yz_rectangle(double y0, double y1, double z0,
double z1, double k,
const Material *material, Arena *arena) {
Hittable *result = arena_alloc(arena, sizeof(Hittable));
result->type = HITTABLE_YZ_RECTANGLE;
result->yz_rectangle.y0 = y0;
result->yz_rectangle.y1 = y1;
result->yz_rectangle.z0 = z0;
result->yz_rectangle.z1 = z1;
result->yz_rectangle.k = k;
result->yz_rectangle.material = material;
return result;
}
static bool hittable_list_hit(const HittableList *list, Ray r, double t_min,
double t_max, HitRecord *record) {
bool hit_anything = false;
@ -251,6 +279,56 @@ static bool xy_rectangle_hit(const XYRectangle *rectangle, Ray r, double t_min,
return true;
}
static bool xz_rectangle_hit(const XZRectangle *rectangle, Ray r, double t_min,
double t_max, HitRecord *record) {
double t = (rectangle->k - r.origin.y) / r.direction.y;
if (t < t_min || t > t_max)
return false;
double x = r.origin.x + t * r.direction.x;
double z = r.origin.z + t * r.direction.z;
if (x < rectangle->x0 || x > rectangle->x1 || z < rectangle->z0 ||
z > rectangle->z1)
return false;
record->u = (x - rectangle->x0) / (rectangle->x1 - rectangle->x0);
record->v = (z - rectangle->z0) / (rectangle->z1 - rectangle->z0);
record->t = t;
Vec3 outward_normal = {0.0, 1.0, 0.0};
hit_record_set_face_normal(record, r, outward_normal);
record->material = rectangle->material;
record->p = ray_at(r, t);
return true;
}
static bool yz_rectangle_hit(const YZRectangle *rectangle, Ray r, double t_min,
double t_max, HitRecord *record) {
double t = (rectangle->k - r.origin.x) / r.direction.x;
if (t < t_min || t > t_max)
return false;
double y = r.origin.y + t * r.direction.y;
double z = r.origin.z + t * r.direction.z;
if (y < rectangle->y0 || y > rectangle->y1 || z < rectangle->z0 ||
z > rectangle->z1)
return false;
record->u = (y - rectangle->y0) / (rectangle->y1 - rectangle->y0);
record->v = (z - rectangle->z0) / (rectangle->z1 - rectangle->z0);
record->t = t;
Vec3 outward_normal = {1.0, 0.0, 0.0};
hit_record_set_face_normal(record, r, outward_normal);
record->material = rectangle->material;
record->p = ray_at(r, t);
return true;
}
bool hittable_hit(const Hittable *hittable, Ray r, double t_min, double t_max,
HitRecord *record) {
switch (hittable->type) {
@ -264,6 +342,10 @@ bool hittable_hit(const Hittable *hittable, Ray r, double t_min, double t_max,
return bvh_node_hit(&hittable->bvh_node, r, t_min, t_max, record);
case HITTABLE_XY_RECTANGLE:
return xy_rectangle_hit(&hittable->xy_rectangle, r, t_min, t_max, record);
case HITTABLE_XZ_RECTANGLE:
return xz_rectangle_hit(&hittable->xz_rectangle, r, t_min, t_max, record);
case HITTABLE_YZ_RECTANGLE:
return yz_rectangle_hit(&hittable->yz_rectangle, r, t_min, t_max, record);
}
return false;
}
@ -325,7 +407,7 @@ static bool bvh_node_bounding_box(const BVHNode *node, AABB *bounding_box) {
return true;
}
static bool xy_rectangle_bouding_box(const XYRectangle *rectangle,
static bool xy_rectangle_bounding_box(const XYRectangle *rectangle,
AABB *bounding_box) {
/* Pad the bounding box to make sure it is not zero-width */
*bounding_box = (AABB){
@ -335,6 +417,26 @@ static bool xy_rectangle_bouding_box(const XYRectangle *rectangle,
return true;
}
static bool xz_rectangle_bounding_box(const XZRectangle *rectangle,
AABB *bounding_box) {
/* Pad the bounding box to make sure it is not zero-width */
*bounding_box = (AABB){
.min = {rectangle->x0, rectangle->k - 0.0001, rectangle->z0},
.max = {rectangle->x1, rectangle->k + 0.0001, rectangle->z1},
};
return true;
}
static bool yz_rectangle_bounding_box(const YZRectangle *rectangle,
AABB *bounding_box) {
/* Pad the bounding box to make sure it is not zero-width */
*bounding_box = (AABB){
.min = {rectangle->k - 0.0001, rectangle->y0, rectangle->z0},
.max = {rectangle->k + 0.0001, rectangle->y1, rectangle->z1},
};
return true;
}
bool hittable_bounding_box(const Hittable *hittable, double time_start,
double time_end, AABB *bounding_box) {
switch (hittable->type) {
@ -349,7 +451,11 @@ bool hittable_bounding_box(const Hittable *hittable, double time_start,
case HITTABLE_BVH_NODE:
return bvh_node_bounding_box(&hittable->bvh_node, bounding_box);
case HITTABLE_XY_RECTANGLE:
return xy_rectangle_bouding_box(&hittable->xy_rectangle, bounding_box);
return xy_rectangle_bounding_box(&hittable->xy_rectangle, bounding_box);
case HITTABLE_XZ_RECTANGLE:
return xz_rectangle_bounding_box(&hittable->xz_rectangle, bounding_box);
case HITTABLE_YZ_RECTANGLE:
return yz_rectangle_bounding_box(&hittable->yz_rectangle, bounding_box);
}
return false;
}

20
hittable.h
View File

@ -28,6 +28,8 @@ typedef enum HittableType {
HITTABLE_MOVING_SPHERE,
HITTABLE_BVH_NODE,
HITTABLE_XY_RECTANGLE,
HITTABLE_XZ_RECTANGLE,
HITTABLE_YZ_RECTANGLE,
} HittableType;
typedef struct Hittable Hittable;
@ -62,6 +64,16 @@ typedef struct XYRectangle {
double x0, x1, y0, y1, k;
} XYRectangle;
typedef struct XZRectangle {
const Material *material;
double x0, x1, z0, z1, k;
} XZRectangle;
typedef struct YZRectangle {
const Material *material;
double y0, y1, z0, z1, k;
} YZRectangle;
struct Hittable {
HittableType type;
union {
@ -70,6 +82,8 @@ struct Hittable {
MovingSphere moving_sphere;
BVHNode bvh_node;
XYRectangle xy_rectangle;
XZRectangle xz_rectangle;
YZRectangle yz_rectangle;
};
};
@ -85,6 +99,12 @@ Hittable *hittable_create_bvh_node(const Hittable **objects, size_t start,
Hittable *hittable_create_xy_rectangle(double x0, double x1, double y0,
double y1, double k,
const Material *material, Arena *arena);
Hittable *hittable_create_xz_rectangle(double x0, double x1, double z0,
double z1, double k,
const Material *material, Arena *arena);
Hittable *hittable_create_yz_rectangle(double y0, double y1, double z0,
double z1, double k,
const Material *material, Arena *arena);
bool hittable_hit(const Hittable *hittable, Ray r, double t_min, double t_max,
HitRecord *record);

57
main.c
View File

@ -22,9 +22,10 @@
#define SCENE_TWO_PERLIN_SPHERES 2
#define SCENE_EARTH 3
#define SCENE_SIMPLE_LIGHT 4
#define SCENE_CORNELL_BOX 5
#ifndef SCENE_SELECT
#define SCENE_SELECT SCENE_SIMPLE_LIGHT
#define SCENE_SELECT SCENE_CORNELL_BOX
#endif
static Color ray_color(Ray r, Color background_color, const Hittable *world,
@ -186,6 +187,41 @@ static Hittable *simple_light(Arena *arena) {
return world;
}
static Hittable *cornell_box(Arena *arena) {
Hittable *world = hittable_create_hittable_list(arena);
Material *red =
material_create_lambertian_color((Color){0.65, 0.05, 0.05}, arena);
Material *white =
material_create_lambertian_color((Color){0.73, 0.73, 0.73}, arena);
Material *green =
material_create_lambertian_color((Color){0.12, 0.45, 0.15}, arena);
Material *light =
material_create_diffuse_light_color((Color){15.0, 15.0, 15.0}, arena);
hittable_list_add(
&world->list,
hittable_create_yz_rectangle(0, 555, 0, 555, 555, green, arena), arena);
hittable_list_add(&world->list,
hittable_create_yz_rectangle(0, 555, 0, 555, 0, red, arena),
arena);
hittable_list_add(
&world->list,
hittable_create_xz_rectangle(213, 343, 227, 332, 554, light, arena),
arena);
hittable_list_add(
&world->list,
hittable_create_xz_rectangle(0, 555, 0, 555, 0, white, arena), arena);
hittable_list_add(
&world->list,
hittable_create_xz_rectangle(0, 555, 0, 555, 555, white, arena), arena);
hittable_list_add(
&world->list,
hittable_create_xy_rectangle(0, 555, 0, 555, 555, white, arena), arena);
return world;
}
int main(int argc, char *argv[]) {
srand(time(0));
@ -212,10 +248,9 @@ int main(int argc, char *argv[]) {
/* Image parameters */
const double aspect_ratio = 16.0 / 9.0;
const int image_width = 400;
const int image_height = (int)(image_width / aspect_ratio);
const int samples_per_pixel = 400;
double aspect_ratio = 16.0 / 9.0;
int image_width = 400;
int samples_per_pixel = 400;
const int max_depth = 50;
Point3 look_from = {0.0, 0.0, 1.0};
@ -260,8 +295,20 @@ int main(int argc, char *argv[]) {
look_from = (Point3){26.0, 3.0, 6.0};
look_at = (Point3){0.0, 2.0, 0.0};
vfov = 20.0;
#elif SCENE_SELECT == SCENE_CORNELL_BOX
world = cornell_box(&arena);
aspect_ratio = 1.0;
image_width = 600;
samples_per_pixel = 200;
background_color = (Color){0.0, 0.0, 0.0};
look_from = (Point3){278.0, 278.0, -800.0};
look_at = (Point3){278.0, 278.0, 0.0};
vfov = 40.0;
#else
#error Unknown scene selected
#endif
int image_height = (int)(image_width / aspect_ratio);
Vec3 up = {0.0, 1.0, 0.0};
Camera camera;