From: Lukas Jiriste <ljiriste@student.42prague.com>
Date: Fri, 22 Nov 2024 19:37:00 +0000 (+0100)
Subject: Implement camera to ray function
X-Git-Url: https://git.ljiriste.work/?a=commitdiff_plain;h=4b5e1e57ffd56faf44699cde657b6600f12c1ac5;p=42%2FminiRT.git

Implement camera to ray function
---

diff --git a/src/main.c b/src/main.c
index a706b99..8e4f55e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,4 @@
+#include "vec3.h"
 #include "miniRT.h"
 #include <mlx.h>
 #include <X11/X.h>
@@ -79,6 +80,29 @@ void	ft_putpx_img(t_img *img, int x, int y, t_color c)
 	return ;
 }
 
+t_ray	get_camera_ray(int x, int y, const t_session *s)
+{
+	t_ray					res;
+	const float				x_max = s->img.width;
+	const float				y_max = s->img.height;
+	const t_camera *const	camera = s->scene.current_camera;
+
+	res.direction = camera->orientation;
+	res.direction =
+		vec_add(
+			res.direction,
+			vec_real_mul(
+				vec_add(
+					vec_real_mul(
+						camera->up_direction,
+						y_max / x_max * (y_max - 1 - 2 * y) / (y_max - 1)),
+					vec_real_mul(
+						vec_vec_mul(camera->orientation, camera->up_direction),
+						(x_max - 1 - 2 * x) / (x_max - 1))),
+				tan(camera->field_of_view / 2)));
+	return (res);
+}
+
 void	draw(t_session *s)
 {
 	int		x;