cling thing

src/model.rs

@@ -90,6 +90,7 @@ pub struct ContactingLadder{
 #[derive(Clone)]
 pub enum ContactingBehaviour{
 	Surf,
+	Cling,//usable as a zipline, or other weird and wonderful things
 	Ladder(ContactingLadder),
 	Elastic(u32),//[1/2^32,1] 0=None (elasticity+1)/2^32
 }

src/physics.rs

@@ -1108,6 +1108,7 @@ impl crate::instruction::InstructionConsumer<PhysicsInstruction> for PhysicsStat
 						let mut v=self.body.velocity;
 						match &contacting.contact_behaviour{
 							Some(crate::model::ContactingBehaviour::Surf)=>println!("I'm surfing!"),
+							Some(crate::model::ContactingBehaviour::Cling)=>println!("Unimplemented!"),
 							&Some(crate::model::ContactingBehaviour::Elastic(elasticity))=>{
 								let n=c.normal(&self.models);
 								let d=n.dot(v)*Planar64::raw(-1-elasticity as i64);