diff --git a/src/body.rs b/src/body.rs
index db6ef5d..bebe3d4 100644
--- a/src/body.rs
+++ b/src/body.rs
@@ -367,7 +367,7 @@ impl PhysicsState {
 		//RelativeCollsion must reference the full model instead of a particular face
 		//this is Ctrl+C Ctrl+V of predict_collision_start but with v=-v before the calc and t=-t after the calc
 		//find best t
-		let mut best_time=time_limit;
+		let mut best_delta_time=time_limit-self.body.time;
 		let mut best_face:Option<TreyMeshFace>=None;
 		let mesh0=self.mesh();
 		let mesh1=model.mesh();
@@ -379,12 +379,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((-t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&0f32<v.x+a.x*-t{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&0f32<v.x+a.x*-t{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Left);
 				}
 			}
@@ -395,12 +395,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((-t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&v.x+a.x*-t<0f32{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&v.x+a.x*-t<0f32{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Right);
 				}
 			}
@@ -412,12 +412,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((-t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&0f32<v.y+a.y*-t{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&0f32<v.y+a.y*-t{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Top);
 				}
 			}
@@ -428,12 +428,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((-t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&v.y+a.y*-t<0f32{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&v.y+a.y*-t<0f32{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Bottom);
 				}
 			}
@@ -445,12 +445,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((-t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&0f32<v.z+a.z*-t{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&0f32<v.z+a.z*-t{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Back);
 				}
 			}
@@ -461,12 +461,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((-t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&v.z+a.z*-t<0f32{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&v.z+a.z*-t<0f32{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Front);
 				}
 			}
@@ -474,7 +474,7 @@ impl PhysicsState {
 		//generate instruction
 		if let Some(face) = best_face{
 			return Some(TimedInstruction {
-				time: best_time,
+				time: self.body.time+best_delta_time,
 				instruction: PhysicsInstruction::CollisionStart(RelativeCollision {
 					face,
 					model: model_id
@@ -485,7 +485,7 @@ impl PhysicsState {
 	}
 	fn predict_collision_start(&self,model:&Model,time_limit:TIME,model_id:u32) -> Option<TimedInstruction<PhysicsInstruction>> {
 		//find best t
-		let mut best_time=time_limit;
+		let mut best_delta_time=time_limit-self.body.time;
 		let mut best_face:Option<TreyMeshFace>=None;
 		let mesh0=self.mesh();
 		let mesh1=model.mesh();
@@ -497,12 +497,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&0f32<v.x+a.x*t{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&0f32<v.x+a.x*t{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Left);
 				}
 			}
@@ -513,12 +513,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&v.x+a.x*t<0f32{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&v.x+a.x*t<0f32{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Right);
 				}
 			}
@@ -530,12 +530,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&0f32<v.y+a.y*t{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&0f32<v.y+a.y*t{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Top);
 				}
 			}
@@ -546,12 +546,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&v.y+a.y*t<0f32{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&v.y+a.y*t<0f32{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x&&mesh1.min.z<mesh0.max.z+dp.z&&mesh0.min.z+dp.z<mesh1.max.z {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Bottom);
 				}
 			}
@@ -563,12 +563,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&0f32<v.z+a.z*t{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&0f32<v.z+a.z*t{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Back);
 				}
 			}
@@ -579,12 +579,12 @@ impl PhysicsState {
 			//must beat the current soonest collision time
 			//must be moving towards surface
 			let t_time=((t as f64)*1_000_000_000f64) as TIME;
-			if 0<=t_time&&t_time<best_time&&v.z+a.z*t<0f32{
-				let dp=self.body.extrapolated_position(t_time)-p;
+			if 0<=t_time&&t_time<best_delta_time&&v.z+a.z*t<0f32{
+				let dp=self.body.extrapolated_position(self.body.time+t_time)-p;
 				//faces must be overlapping
 				if mesh1.min.y<mesh0.max.y+dp.y&&mesh0.min.y+dp.y<mesh1.max.y&&mesh1.min.x<mesh0.max.x+dp.x&&mesh0.min.x+dp.x<mesh1.max.x {
 					//collect valid t
-					best_time=t_time;
+					best_delta_time=t_time;
 					best_face=Some(TreyMeshFace::Front);
 				}
 			}
@@ -592,7 +592,7 @@ impl PhysicsState {
 		//generate instruction
 		if let Some(face) = best_face{
 			return Some(TimedInstruction {
-				time: best_time,
+				time: self.body.time+best_delta_time,
 				instruction: PhysicsInstruction::CollisionStart(RelativeCollision {
 					face,
 					model: model_id