diff --git a/src/gameplay_style.rs b/src/gameplay_style.rs
index 7cb35e8..e70751b 100644
--- a/src/gameplay_style.rs
+++ b/src/gameplay_style.rs
@@ -228,6 +228,16 @@ pub struct WalkSettings{
 	surf_dot:Planar64,//surf_dot<n.dot(up)/n.length()
 }
 impl WalkSettings{
+	pub fn accel(&self,target_diff:Planar64Vec3,gravity:Planar64Vec3)->Planar64{
+		//TODO: fallible walk accel
+		let diff_len=target_diff.length();
+		let friction=if diff_len<self.accelerate.topspeed{
+			self.static_friction
+		}else{
+			self.kinetic_friction
+		};
+		self.accelerate.accel.min(-Planar64Vec3::Y.dot(gravity)*friction)
+	}
 	pub fn get_walk_target_velocity(&self,control_dir:Planar64Vec3,normal:Planar64Vec3)->Planar64Vec3{
 		if control_dir==Planar64Vec3::ZERO{
 			return control_dir;
@@ -263,6 +273,10 @@ pub struct LadderSettings{
 	dot:Planar64,
 }
 impl LadderSettings{
+	pub fn accel(&self,target_diff:Planar64Vec3,gravity:Planar64Vec3)->Planar64{
+		//TODO: fallible ladder accel
+		self.accelerate.accel
+	}
 	pub fn get_ladder_target_velocity(&self,mut control_dir:Planar64Vec3,normal:Planar64Vec3)->Planar64Vec3{
 		if control_dir==Planar64Vec3::ZERO{
 			return control_dir;