// here is how i call it
if(c.isKeyJustPressed(KEY_RBUTTON))
{
    int state = 0;
    vec3d hit_pos = vec3d();
    vec3d pos_before_hit = vec3d();
    uint block_offset;

    vec3d ray_pos = pos;
    ray_pos.y += cam_height;
    vec3d look_dir( Maths::Sin((dir_x)*Maths::Pi/180)*Maths::Cos(dir_y*Maths::Pi/180),
                    Maths::Sin(dir_y*Maths::Pi/180),
                    Maths::Cos((dir_x)*Maths::Pi/180)*Maths::Cos(dir_y*Maths::Pi/180));
    Raycast_precise(@SM, ray_pos, look_dir, 16, state, hit_pos, pos_before_hit);

    if(state == 1)
    {
        SM.set_block(pos_before_hit.x, pos_before_hit.y, pos_before_hit.z, block_stone);

        pos_before_hit = pos_before_hit/16;
        int offset = Maths::Min(int(pos_before_hit.z)+int(pos_before_hit.x)*z_size+x_size*z_size*int(pos_before_hit.y), SM.chunks.size()-1);
        SM.chunks[offset].rebuildMesh();
    }
}


// function itself
void Raycast_precise(SuperMap@ SM, vec3d ray_pos, vec3d ray_dir, int max_dist, int &out state, vec3d &out hit_pos, vec3d &out pos_before_hit)
{
    vec3d ray_world_pos = vec3d(int(ray_pos.x), int(ray_pos.y), int(ray_pos.z));
    vec3d delta_dist = vec3d(Maths::Abs(1/ray_dir.x), Maths::Abs(1/ray_dir.y), Maths::Abs(1/ray_dir.z));
    vec3d side_dist;
    vec3d step;
    if(ray_dir.x < 0)
    {
        step.x = -1;
        side_dist.x = (ray_pos.x - ray_world_pos.x) * delta_dist.x;
    }
    else
    {
        step.x = 1;
        side_dist.x = (ray_world_pos.x + 1.0f - ray_pos.x) * delta_dist.x;
    }
    if(ray_dir.y < 0)
    {
        step.y = -1;
        side_dist.y = (ray_pos.y - ray_world_pos.y) * delta_dist.y;
    }
    else
    {
        step.y = 1;
        side_dist.y = (ray_world_pos.y + 1.0f - ray_pos.y) * delta_dist.y;
    }
    if(ray_dir.z < 0)
    {
        step.z = -1;
        side_dist.z = (ray_pos.z - ray_world_pos.z) * delta_dist.z;
    }
    else
    {
        step.z = 1;
        side_dist.z = (ray_world_pos.z + 1.0f - ray_pos.z) * delta_dist.z;
    }
    while(max_dist > 0)
    {
        pos_before_hit = ray_world_pos;
        if(side_dist.x < side_dist.y)
        {
            if(side_dist.x < side_dist.z)
            {
                side_dist.x += delta_dist.x;
                ray_world_pos.x += step.x;
                if(ray_world_pos.x > map_width || ray_world_pos.x < 0)
                {
                    print("oob on x side");
                    state = 3;
                    return;
                }
            }
            else
            {
                side_dist.z += delta_dist.z;
                ray_world_pos.z += step.z;
                if(ray_world_pos.z > map_depth || ray_world_pos.z < 0)
                {
                    print("oob on z side");
                    state = 3;
                    return;
                }
            }
        }
        else
        {
            if(side_dist.y < side_dist.z)
            {
                side_dist.y += delta_dist.y;
                ray_world_pos.y += step.y;
                if(ray_world_pos.y > map_height || ray_world_pos.y < 0)
                {
                    print("oob on y side");
                    state = 3;
                    return;
                }
            }
            else
            {
                side_dist.z += delta_dist.z;
                ray_world_pos.z += step.z;
                if(ray_world_pos.z > map_depth || ray_world_pos.z < 0)
                {
                    print("oob on z side");
                    state = 3;
                    return;
                }
            }
        }
        u8 check = SM.get_block(ray_world_pos.x, ray_world_pos.y, ray_world_pos.z);
        if(check != block_air)
        {
            print("hit something");
            state = 1;
            hit_pos = ray_world_pos;
            //pos_before_hit = ray_world_pos;
            return;
        }
        max_dist--;
    }
    print("too far");
    state = 2;
}