Extract the eight corners of a box.

Input parameters:

1. Bx → Box for corner point extraction.

Output parameters:

1. ←↙↑ → Point in the upper left front corner. (x:min, y:min, z:max)
2. →↙↑ → Point in the upper right front corner. (x:max, y:min, z:max)
3. →↗↑ → Point in the upper right back corner. (x:max, y:max, z:max)
4. ←↗↑ → Point in the upper left back corner. (x:min, y:max, z:max)
5. ←↙↓ → Point in the lower left front corner. (x:min, y:min, z:min)
6. →↙↓ → Point in the lower right front corner. (x:max, y:min, z:min)
7. →↗↓ → Point in the lower right back corner. (x:max, y:max, z:min)
8. ←↗↓ → Point in the lower left back corner. (x:min, y:max, z:min)