require vertices to be defined
require vertices to be defined

Luwdo/PhysicsJS,griever989/PhysicsJS,Rawneed/PhysicsJS,Rawneed/PhysicsJS,wellcaffeinated/PhysicsJS,griever989/PhysicsJS,haithemaraissia/PhysicsJS,eric-seekas/PhysicsJS,wellcaffeinated/PhysicsJS,Luwdo/PhysicsJS,pietro909/PhysicsJS,Nayar/PhysicsJS,VANITAX/PhysicsJS,jpellerin/PhysicsJS,jpellerin/PhysicsJS,aldeed/PhysicsJS,eric-seekas/PhysicsJS,131/PhysicsJS,pietro909/PhysicsJS,VANITAX/PhysicsJS,haithemaraissia/PhysicsJS,Nayar/PhysicsJS,rohit765/PhysicsJS,mcanthony/PhysicsJS,mcanthony/PhysicsJS,aldeed/PhysicsJS,rohit765/PhysicsJS