Fixed the calculation of the starting position (#220)

.gitignore

@@ -266,5 +266,6 @@ cython_debug/
 # End of https://www.toptal.com/developers/gitignore/api/python,visualstudiocode,pycharm
 
 **/*.dat
+**/info*.json
 !tests/shieldhit/resources/expected_shieldhit_output/*.dat
 .vscode/settings.json

converter/shieldhit/geo.py

@@ -38,7 +38,9 @@ def _parse_box(box: BoxFigure, number: int) -> str:
     x_vec = rotate([box.x_edge_length, 0, 0], box.rotation)
     y_vec = rotate([0, box.y_edge_length, 0], box.rotation)
     z_vec = rotate([0, 0, box.z_edge_length], box.rotation)
-    diagonal_vec = x_vec + y_vec + z_vec
+    diagonal_vec = [x_vec[0] + y_vec[0] + z_vec[0],
+                    x_vec[1] + y_vec[1] + z_vec[1],
+                    x_vec[2] + y_vec[2] + z_vec[2],]
     start_position = (
         box.position[0] - diagonal_vec[0] / 2,
         box.position[1] - diagonal_vec[1] / 2,