You will need to bring the geometry into AC as a GDL Object. You will first have to save the geometry out of C4D as .DWG, .3DS or other format that AC can convert into a .GSM file format.
David Larrew, AIA, GDLA, GSRC
Architectural Technology Specialist
a r c h i S O L U T I O N S
WIN7-10/ OSX 10.15.7
AC 5.1-25 USA