feat: Intersect with TriangleSoup

src/TriangleSoup.cpp

@@ -4,12 +4,28 @@
 #include "first_hit.h"
 
 bool TriangleSoup::intersect(
-  const Ray & ray, const double min_t, double & t, Eigen::Vector3d & n) const
+    const Ray & ray, const double min_t, double & t, Eigen::Vector3d & n) const
 {
-  ////////////////////////////////////////////////////////////////////////////
+    bool hit = false;
-  // Replace with your code here:
+    /* Initialize to a value that will never be used. */
-  return false;
+    t = -1;
-  ////////////////////////////////////////////////////////////////////////////
+    /* Alternatively, use a max integer value, and remove the check t == -1. */
+
+    /* Store intermediate results that are not necessarily the first hit. */
+    double t_temp;
+    Eigen::Vector3d n_temp;
+
+    for (const auto & triangle : triangles) {
+        if (triangle->intersect(ray, min_t, t_temp, n_temp)) {
+            hit = true;
+            if (t == -1 || t_temp < t) {
+                t = t_temp;
+                n = n_temp;
+            }
+        }
+    }
+
+    return hit;
 }