Fix build and sloppy build errors

.gitignore

@@ -1,4 +1,5 @@
 exercise1/build/
 exercise2/build/
+exercise3/build/
 
 .vscode/ipch

.vscode/tasks.json

@@ -36,6 +36,27 @@
         "clear": true
       }
     },
+    {
+      "label": "Run Exercise 3",
+      "type": "shell",
+      "command": "exercise3/build/cmake/./exercise3",
+      "dependsOn": "Build Exercise 3",
+      "problemMatcher": []
+    },
+    {
+      "label": "Build Exercise 3",
+      "type": "shell",
+      "command": "cd exercise3/build/cmake && cmake . && make -j4",
+      "problemMatcher": [],
+      "presentation": {
+        "echo": true,
+        "reveal": "always",
+        "focus": false,
+        "panel": "shared",
+        "showReuseMessage": true,
+        "clear": true
+      }
+    },
     {
       "label": "Run Exercise 2",
       "type": "shell",

exercise3/build/cmake/CMakeLists.txt

@@ -55,4 +55,4 @@ add_executable(exercise3
 )
 
 # Bibliotheken linken
-target_link_libraries(exercise3 ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
+target_link_libraries(exercise3 ${OPENGL_LIBRARIES} ${GLUT_LIBRARY}  -lpthread)

exercise3/include/tiny_vec.h

@@ -22,6 +22,7 @@ At the end of this file the data types "point2d", "point3d" and
 #include <iostream>
 #include <algorithm>
 #include <cassert>
+#include <numeric>
 #include <math.h>
 
 #ifdef _MSC_VER