Change a corner point on the box
The descriptions of the corners may not match the actual locations of corners. These descriptions reflect the locations on a 'normal' box. Index 0 and 3 will be opposite corners. Also, index 1 and 2 will be opposite corners.
| index | Description |
| 0 | The lower left corner |
| 1 | The lower right corner |
| 2 | The upper left corner |
| 3 | The upper right corner |
| index |
The index of the point |
| x |
The new x coordinate for the point |
| y |
The new y coordinate for the point |