There are some pretty sweet features in Cinema 4d, one is a built in parametric spiral staircase that I've been wanting to take advantage of. Does anyone here routinely export from C4D and import into Viacad? If so, any suggestions on the best file format to exchange with? I've tried lots of formats and settings and as far as editablity in Viacad goes, they all appear pretty lacking IME. Any advice is welcome.