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camera.c
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camera.c
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#include "camera.h"
ray_type compute_view_ray(camera_type* cam, size_t screen_size_x, size_t screen_size_y, int64_t pixel_index_x, int64_t pixel_index_y)
{
int64_t pixel_coord_x = pixel_index_x - screen_size_x / 2;
int64_t pixel_coord_y = pixel_index_y - screen_size_y / 2;
v3f camera_w_axis = v3f_scale(cam->view_direction, -1.0f);
v3f camera_u_axis = v3f_cross_prod(cam->upward_direction, camera_w_axis);
ray_type view_ray;
view_ray.origin = cam->position;
view_ray.direction = v3f_direction(v3f_create(pixel_coord_x * PIXEL_SIZE,
pixel_coord_y * PIXEL_SIZE,
-cam->focal_length));
view_ray.direction = object_world_transform(camera_u_axis,
cam->upward_direction,
camera_w_axis,
v3f_create(0.0f, 0.0f, 0.0f),
view_ray.direction);
return view_ray;
}