I'm trying to build simple raycasting game. I'm rendering wall based on light length. Wall size is calculated based on natural log formula. Problem is fisheye! I tries cos formula but it's not applicable to my architecture. Here's the code:
void draw_3d(t_cub3d *this, double len, int num_of_ray, double start)
{
double height;
double width;
double x;
double y;
height = 720 / log10(len + 1);
if (height > 720)
height = 720;
width = 1280.0 / 640;
y = (720 - height) / 2;
while (y < height)
{
x = 2 * num_of_ray;
while(x < 2 + width * num_of_ray)
{
my_mlx_pixel_put(this, (int)x, (int)y, 0xfffff);
x++;
}
y++;
}
}
int raycast(t_cub3d *this)
{
double start = this->raycast->pa - this->raycast->fov;
double end = this->raycast->pa + this->raycast->fov;
double ray_p_x;
double ray_p_y;
double len;
int num_of_ray;
num_of_ray = 0;
while (start <= end)
{
ray_p_x = this->raycast->px;
ray_p_y = this->raycast->py;
while (this->gameinfo->map[(int) ray_p_y / 30][(int) ray_p_x / 30] != '1' && this->gameinfo->map[(int) ray_p_y / 30][(int) ray_p_x / 30] != ' ')
{
ray_p_x += cos(start);
ray_p_y += sin(start);
}
len = fabs(this->raycast->px - ray_p_x) / fabs(cos(start));
len *= cos(this->raycast->pa - start);
start += this->raycast->fov / 320;
draw_3d(this, len, num_of_ray, start);
num_of_ray++;
}
mlx_put_image_to_window(this->mlx_info->mlx, this->mlx_info->mlx_win, this->img->img, 0, 0);
return (0);
}
How to fix fisheye distortion if cos formula doesn't apply to my case.
