The development of Super Mario 64 took less than two years , but it was reported that producer and director Shigeru Miyamoto had conceived of a 3D Mario game concept over five years before , while working on Star Fox .
Super Mario 64 was made in less than two years , but it was reported that Shigeru Miyamoto had thought about a 3D Mario game , called Super Mario FX , five years before , while working on Star Fox .