add history to guides

src/util.h

@@ -57,6 +57,10 @@ glm::vec4 box_union(glm::vec4 a, glm::vec4 b);
 glm::vec4 box_intersection(glm::vec4 a, glm::vec4 b);
 bool ray_intersect(glm::vec3 ray_origin, glm::vec3 ray_dir, glm::vec3 plane_origin,
     glm::vec3 plane_normal, glm::vec3 plane_tangent, glm::vec3& out_hit, float& out_t);
+float lines_distance(const glm::vec3& p0a, const glm::vec3& p0b,
+    const glm::vec3& p1a, const glm::vec3& p1b);
+bool segments_intersect_3d(const glm::vec3& p0a, const glm::vec3& p0b,
+    const glm::vec3& p1a, const glm::vec3& p1b, glm::vec3& out_pt, glm::vec2& out_hit_uv);
 bool segments_intersect(const glm::vec2& p0a, const glm::vec2& p0b,
     const glm::vec2& p1a, const glm::vec2& p1b, glm::vec2& out_pt, glm::vec2& out_hit_uv);
 bool point_side(glm::vec2 a, glm::vec2 b, glm::vec2 p);