From: Lukas Jiriste <ljiriste@student.42prague.com>
Date: Sat, 4 Jan 2025 12:36:28 +0000 (+0100)
Subject: Fix not rendering the inside of objects correctly
X-Git-Url: https://git.ljiriste.work/?a=commitdiff_plain;h=71d73f569cee651b91c5ac794c6c36a02ef02130;p=42%2FminiRT.git

Fix not rendering the inside of objects correctly

The optimization of seeing whether the circumsphere would interact with
a ray contains a check for whether the circumsphere CENTER is behind the
ray origin instead of its furthest point. This is now rectified which
fixes the rendering when inside an object.
---

diff --git a/src/scene.c b/src/scene.c
index 44fb0b5..6b35944 100644
--- a/src/scene.c
+++ b/src/scene.c
@@ -83,7 +83,7 @@ int	intersects_circumsphere(const t_ray *ray, const t_object *object)
 	double		distance;
 
 	circumsphere = get_circumsphere(object);
-	if (is_behind_ray(ray, circumsphere.center))
+	if (is_behind_ray(ray, vec_add(circumsphere.center, vec_real_mul(ray->direction, circumsphere.radius))))
 		return (0);
 	distance = dist_point_from_line(ray, circumsphere.center);
 	return (distance < circumsphere.radius);