| 4 | | * double x1 - x coordinate of first point. |
| 5 | | * double y1 - y coordinate of first point. |
| 6 | | * double z1 - z coordinate of first point. |
| 7 | | * double x2 - x coordinate of second point. |
| 8 | | * double y2 - y coordinate of second point. |
| 9 | | * double z2 - z coordinate of second point. |
| | 4 | * 1: double x1 - x coordinate of first point. |
| | 5 | * 2: double y1 - y coordinate of first point. |
| | 6 | * 3: double z1 - z coordinate of first point. |
| | 7 | * 4: double x2 - x coordinate of second point. |
| | 8 | * 5: double y2 - y coordinate of second point. |
| | 9 | * 6: double z2 - z coordinate of second point. |