player movement tuning

godot/player/OnFootPhysics.gd

@@ -2,15 +2,26 @@ extends KinematicBody
 
 onready var util = get_node("/root/Util")
 
-export var gravity: float = 2.5
+export var gravity: float = 6.0
+# When falling, gravity is artificially increased
+export var gravity_downwards_factor: float = 2
+# Rate of gaining speed
+export var velocity_acceleration_xz: float = 3
+export var velocity_acceleration_y: float = 5
+# Rate of losing speed when stopping
+export var velocity_friction_xz: float = 15
+export var velocity_friction_y: float = 1
+export var jump_power: float = 50
+
+# Controls the base speeds of walking and sprinting
+export var sprint_factor: float = 1.5
+export var walk_factor: float = 1.0
+
+export var max_xz_speed: float = 2
+
 "public" var velocity: Vector3 = Vector3.ZERO
-export var velocity_acceleration: float = 5
-export var velocity_friction: float = 5
-export var jump_power: float = 125
-export var sprint_factor: float = 1.07
-
+# Value changed by code only to add slow down or speed up effects
 var velocity_factor: Vector3 = Vector3.ONE
-
 var target_velocity: Vector3 = Vector3.ZERO
 var is_jumping: bool = false
 var jump_permission: float = 1.0
@@ -30,7 +41,10 @@ func process_velocity(delta: float):
 	# Gravity
 	# You can buffer jumps by pressing releaseing the space bar and then pressing it again
 	if not is_on_floor():
-		target_velocity.y = -gravity
+		var grav = -gravity
+		target_velocity.y = grav 
+		# Gravity is stronger when you're falling. Feels nicer
+		target_velocity.y *= util.clamped_lerp(gravity_downwards_factor, 1.0, velocity.y/2, 0.0)
 	else:
 		velocity.y = max(0.0, velocity.y)
 		target_velocity.y = max(0.0, max(target_velocity.y, jump_power * $"../MovementInput".jump_intent * jump_permission))
@@ -44,35 +58,36 @@ func process_velocity(delta: float):
 	
 	var target_velocity_xz = $"../MovementInput".input_xz 
 	target_velocity = util.vec2_xz_to_vec3(target_velocity_xz, target_velocity.y)
-	
 	var velocity_xz = util.vec3_xz(velocity)
 
-	var xz_weight = velocity_acceleration * delta
-	if target_velocity_xz.length() < velocity_xz.length():
-		xz_weight = velocity_friction * delta
 
-	var target_xz_length = lerp(velocity_xz.length(), target_velocity_xz.length(), xz_weight)
+
+	var xz_weight = velocity_acceleration_xz * delta
+	if target_velocity_xz.length() < velocity_xz.length():
+		xz_weight = velocity_friction_xz * delta
+
+	var target_xz_length = util.clamped_lerp(velocity_xz.length(), target_velocity_xz.length(), xz_weight, 0.25)
+	
 	if target_velocity_xz != Vector2.ZERO:
 		velocity_xz = target_velocity_xz.normalized() * target_xz_length
 	elif velocity_xz != Vector2.ZERO:
 		velocity_xz = velocity_xz.normalized() * target_xz_length
-		
-	if (target_velocity_xz - velocity_xz).length() <= 0.025:
-		velocity_xz = target_velocity_xz
 	
-	var y_weight = velocity_acceleration * delta
+	var y_weight = velocity_acceleration_y * delta
 	if target_velocity.y < velocity.y:
-		y_weight = velocity_friction * delta
+		y_weight = velocity_friction_y * delta
 	
-	var velocity_y = lerp(velocity.y, target_velocity.y, y_weight)
-	if abs(target_velocity.y - velocity_y) <= 0.025:
-		velocity_y = target_velocity.y
+	var velocity_y = util.clamped_lerp(velocity.y, target_velocity.y, y_weight, 0.25)
 
 	if $"../MovementInput".sprinting:
 		velocity_xz *= sprint_factor
+	else:
+		velocity_xz *= walk_factor
 
 	velocity = util.vec2_xz_to_vec3(velocity_xz, velocity_y) * velocity_factor
 
+	velocity = util.vec2_xz_to_vec3(util.vec3_xz(velocity).limit_length(max_xz_speed), velocity.y)
+
 func increase_velocity_factor(by: Vector3):
 	velocity_factor *= by
 	

godot/tests/test_player_locomotion.tscn

@@ -10,7 +10,7 @@ data = PoolVector3Array( -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1
 [node name="test_player_locomotion" type="Spatial"]
 
 [node name="MeshInstance" type="MeshInstance" parent="."]
-transform = Transform( 2.74393, 0, 0, 0, 1, 0, 0, 0, 4.27982, 0, -1.16203, 0 )
+transform = Transform( 2.74866, 0, 0, 0, 1.00172, 0, 0, 0, 13.5755, 0, -1.16203, 0 )
 mesh = SubResource( 1 )
 
 [node name="StaticBody" type="StaticBody" parent="MeshInstance"]
@@ -27,5 +27,23 @@ mesh = SubResource( 1 )
 [node name="CollisionShape" type="CollisionShape" parent="MeshInstance2/StaticBody"]
 shape = SubResource( 2 )
 
+[node name="MeshInstance3" type="MeshInstance" parent="."]
+transform = Transform( 2.74393, 0, 0, 0, 1.89317, 0, 0, 0, 0.864162, 0, -1.16203, 5.22145 )
+mesh = SubResource( 1 )
+
+[node name="StaticBody" type="StaticBody" parent="MeshInstance3"]
+
+[node name="CollisionShape" type="CollisionShape" parent="MeshInstance3/StaticBody"]
+shape = SubResource( 2 )
+
+[node name="MeshInstance4" type="MeshInstance" parent="."]
+transform = Transform( 2.74393, 0, 0, 0, 1.89317, 0, 0, 0, 0.864162, 0, -0.269292, 7.68151 )
+mesh = SubResource( 1 )
+
+[node name="StaticBody" type="StaticBody" parent="MeshInstance4"]
+
+[node name="CollisionShape" type="CollisionShape" parent="MeshInstance4/StaticBody"]
+shape = SubResource( 2 )
+
 [node name="Player" parent="." instance=ExtResource( 1 )]
 transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.566872, 2.73697 )

godot/util.gd

@@ -24,3 +24,10 @@ func activate_node(node: Node):
 	node.set_process(true)
 	node.set_physics_process(true)
 	node.set_process_input(true)
+
+func clamped_lerp(src: float, dest: float, weight: float, close_enough: float):
+	weight = clamp(weight, 0.0, 1.0)
+	var v = lerp(src, dest, weight)
+	if abs(dest - v) < close_enough:
+		return dest
+	return v