Claiming that "the entire visual effects industry now operates on race-to-the bottom conditions," IATSE president Matt Loeb has extended "an open invitation to all members of the VFX community to offer assistance." The offer comes in the wake of this month's bankruptcy of ARC Productions in Toronto, and allegations that Nitrogen Studios didn't pay overtime to animators on Sony’s recent release Sausage Party, which was shot in British Columbia. The union says it has…