Add array access to Triangle struct

src/model/obj.h

@@ -2,6 +2,7 @@
 #define OBJ_H
 
 #include "aliases.h"
+#include "constants.h"
 #include "img.h"
 #include "mem_arena.h"
 #include "typed_list.h"
@@ -12,16 +13,31 @@
 
 typedef struct triangle Triangle;
 struct triangle {
+  union {
+    u64 positions[TRIANGLE_VERTICES];
+    struct {
       u64 p0;
       u64 p1;
       u64 p2;
+    };
+  };
+  union {
+    u64 normals[TRIANGLE_VERTICES];
+    struct {
       u64 n0;
       u64 n1;
       u64 n2;
+    };
+  };
+  union {
+    u64 coordinates[TRIANGLE_VERTICES];
+    struct {
       u64 tx0;
       u64 tx1;
       u64 tx2;
     };
+  };
+};
 
 MAKE_LIST_TYPE(Triangle);