fix: applied fixes for g++

polygon.hpp

@@ -2,6 +2,7 @@
 #define POLYGON_H
 
 #include "fastmath.hpp"
+#include <iostream>
 struct polygon {
 
     vec3 points[3];
@@ -60,7 +61,7 @@ struct polygon {
 
     vec3 avgNormal() {
         vec3 result;
-        for (int i = 0; i++; i < 3) {
+        for (int i = 0; i < 3;i++) {
             result += normals[i];
         }
         return result * decimal(0.3333);