Running time of C2A is unexpected long

[gdwei]

Dear Tang,

Thank you for sharing the your wonderful work C2A on Github.

I have tested several toy examples like cubes and spheres, and found out that when the inputs are two cubes(with 12288 faces), the computational overhead is extremely high(~37ms), compared to that of two spheres(with 74240 faces) which only takes ~2.6ms.

Is it normal? And if not, is there any way to improve this situation?

Best regards,
Gordon