fix: Articulate pants with leg bones and fix walking animation clipping

scripts/avatar/avatar_loader.gd

@@ -191,23 +191,52 @@ func load_attachment(slot_id: String, asset_id: String) -> Node3D:
 	# skeleton; static props (the common case) are unaffected.
 	_retarget_skin(attachment_node)
 
-	# Mount to the appropriate bone via a BoneAttachment3D so it follows the
-	# skeleton. Falls back to a plain skeleton child if the mount bone is
-	# missing (a bad catalog entry) rather than dropping the attachment.
-	var mount_bone: String = asset_meta.get("mount_bone", "")
-	if mount_bone.is_empty():
-		mount_bone = _slot_to_mount_bone(slot_id)
+	# Check if this attachment has multi-bone children (e.g. Attach_LeftUpperLeg, Attach_Hips).
+	var multi_bone_children: Array[Node] = []
+	for child in attachment_node.get_children():
+		var cname := child.name
+		if cname.begins_with("Attach_") or cname.begins_with("attach_"):
+			var target_bone := cname.substr(7)
+			if skeleton.find_bone(target_bone) != -1:
+				multi_bone_children.append(child)
+
 	var mount_node: Node3D
-	if not mount_bone.is_empty() and skeleton.find_bone(mount_bone) != -1:
-		var ba := BoneAttachment3D.new()
-		ba.name = "Mount_%s" % slot_id if slot_id != "accessory" else "Mount_accessory_%s" % asset_id
-		ba.bone_name = mount_bone
-		skeleton.add_child(ba)
-		ba.add_child(attachment_node)
-		mount_node = ba
-	else:
+	if not multi_bone_children.is_empty():
+		var created_bas: Array[BoneAttachment3D] = []
+		for child in multi_bone_children:
+			var target_bone := child.name.substr(7)
+			var ba := BoneAttachment3D.new()
+			ba.name = "Mount_%s_%s" % [slot_id, target_bone]
+			ba.bone_name = target_bone
+			skeleton.add_child(ba)
+			attachment_node.remove_child(child)
+			ba.add_child(child)
+			created_bas.append(ba)
+
 		skeleton.add_child(attachment_node)
+		attachment_node.set_meta("bone_attachments", created_bas)
+		attachment_node.tree_exiting.connect(func():
+			for ba in created_bas:
+				if is_instance_valid(ba) and not ba.is_queued_for_deletion():
+					ba.queue_free()
+		)
 		mount_node = attachment_node
+	else:
+		# Single mount bone via a BoneAttachment3D so it follows the skeleton.
+		# Falls back to a plain skeleton child if the mount bone is missing.
+		var mount_bone: String = asset_meta.get("mount_bone", "")
+		if mount_bone.is_empty():
+			mount_bone = _slot_to_mount_bone(slot_id)
+		if not mount_bone.is_empty() and skeleton.find_bone(mount_bone) != -1:
+			var ba := BoneAttachment3D.new()
+			ba.name = "Mount_%s" % slot_id if slot_id != "accessory" else "Mount_accessory_%s" % asset_id
+			ba.bone_name = mount_bone
+			skeleton.add_child(ba)
+			ba.add_child(attachment_node)
+			mount_node = ba
+		else:
+			skeleton.add_child(attachment_node)
+			mount_node = attachment_node
 
 	# Store the top-level mount node so unload can free the whole unit.
 	if slot_id == "accessory":
@@ -228,11 +257,19 @@ func unload_attachment(slot_id: String) -> void:
 	if slot_id == "accessory":
 		for node in _attachments.get("accessory", []):
 			if is_instance_valid(node):
+				if node.has_meta("bone_attachments"):
+					for ba in node.get_meta("bone_attachments"):
+						if is_instance_valid(ba):
+							ba.queue_free()
 				node.queue_free()
 		_attachments.erase("accessory")
 	else:
 		var node = _attachments.get(slot_id)
 		if is_instance_valid(node):
+			if node.has_meta("bone_attachments"):
+				for ba in node.get_meta("bone_attachments"):
+					if is_instance_valid(ba):
+						ba.queue_free()
 			node.queue_free()
 		_attachments.erase(slot_id)
 

scripts/avatar/limb_animator.gd

@@ -12,7 +12,7 @@ extends Node
 
 const STRIDE := 0.42         ## peak hip swing, radians (~24 deg)
 const ARM_SWING := 0.32      ## peak shoulder swing, radians
-const KNEE := 0.5            ## peak knee bend, radians
+const KNEE := 0.0            ## peak knee bend, radians (0.0 for rigid placeholder limbs so feet/shoes don't dislocate)
 const CYCLE := 1.9           ## phase (radians) advanced per metre travelled
 const BLEND := 12.0          ## ease rate toward the target pose
 const MOVE_EPS := 0.35       ## m/s below which we treat the avatar as idle

scripts/tools/gen_placeholder_avatars.gd

@@ -458,27 +458,38 @@ func _gen_pants_cargo() -> void:
 	pocket_mat.albedo_color = Color(0.20, 0.24, 0.32) # Dark pocket trim
 	pocket_mat.roughness = 0.9
 
-	# 1. Waist section (covering hips across both legs)
+	# 1. Waist mounted to Hips bone (Y=0.76)
+	var attach_hips := Node3D.new()
+	attach_hips.name = "Attach_Hips"
+	root.add_child(attach_hips)
+
 	var waist := MeshInstance3D.new()
 	waist.name = "Waist"
 	var waist_mesh := BoxMesh.new()
-	waist_mesh.size = Vector3(0.86, 0.20, 0.50)
+	waist_mesh.size = Vector3(0.88, 0.22, 0.52)
 	waist.mesh = waist_mesh
-	waist.position = Vector3(0.0, -0.06, 0.0) # Relative to Hips bone (Y=0.76)
+	waist.position = Vector3(0.0, -0.05, 0.0) # Relative to Hips (Y=0.76), covers world Y 0.60 to 0.82
 	waist.material_override = pants_mat
-	root.add_child(waist)
+	attach_hips.add_child(waist)
 
-	# 2. Left and Right Pant Legs (legs are 0.40 wide, 0.78 tall, 0.46 deep, centers X = +-0.21)
+	# 2. Left and Right Pant Legs mounted to LeftUpperLeg and RightUpperLeg
 	for side in [-1.0, 1.0]:
 		var sname := "Right" if side < 0.0 else "Left"
+		var attach_leg := Node3D.new()
+		attach_leg.name = "Attach_%sUpperLeg" % sname
+		root.add_child(attach_leg)
+
 		var leg := MeshInstance3D.new()
 		leg.name = "PantLeg_%s" % sname
 		var leg_mesh := BoxMesh.new()
-		leg_mesh.size = Vector3(0.44, 0.64, 0.50) # Covers down to ankle
+		# Encases leg from hip joint down to ankle/sole.
+		# Relative to UpperLeg bone (Y=0.74), center Y=-0.37, height 0.76 covers Y=-0.75 to +0.01 (world Y=-0.01 to 0.75).
+		# Width 0.44 encloses 0.40 leg, Depth 0.50 encloses 0.46 leg.
+		leg_mesh.size = Vector3(0.44, 0.76, 0.50)
 		leg.mesh = leg_mesh
-		leg.position = Vector3(side * 0.21, -0.34, 0.0)
+		leg.position = Vector3(0.0, -0.37, 0.0)
 		leg.material_override = pants_mat
-		root.add_child(leg)
+		attach_leg.add_child(leg)
 
 		# Cargo pocket on outer side
 		var pocket := MeshInstance3D.new()
@@ -486,9 +497,9 @@ func _gen_pants_cargo() -> void:
 		var pocket_mesh := BoxMesh.new()
 		pocket_mesh.size = Vector3(0.08, 0.20, 0.24)
 		pocket.mesh = pocket_mesh
-		pocket.position = Vector3(side * 0.44, -0.32, 0.0)
+		pocket.position = Vector3(side * 0.23, -0.32, 0.0)
 		pocket.material_override = pocket_mat
-		root.add_child(pocket)
+		attach_leg.add_child(pocket)
 
 	_write_glb(root, "pants_cargo_01")
 	root.free()