fix firstpersson shadow movement

src/FirstPersonPlayer.cpp

@@ -5,6 +5,7 @@
 #include <godot_cpp/classes/input_event_mouse_motion.hpp>
 #include <godot_cpp/classes/input_map.hpp>
 #include <godot_cpp/core/math.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
 
 using namespace godot;
 
@@ -32,6 +33,9 @@ static constexpr float FOV_TRANSITION = 8.0f;
 static constexpr float MIN_FOV_VELOCITY = 0.5;
 static constexpr float MAX_FOV_VELOCITY = SPRINT_SPEED * 2.0f;
 
+static const float LerpValue = 0.10;
+static const float AnimationBlend = 7.0;
+
 void FirstPersonPlayer::_bind_methods() {}
 
 FirstPersonPlayer::FirstPersonPlayer() : m_BobTime(0) {}
@@ -44,9 +48,9 @@ void FirstPersonPlayer::_ready() {
 		Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
 	}
 	m_Head = Object::cast_to<Node3D>(find_child("Head"));
-	DEV_ASSERT(m_Head);
 	m_Camera = Object::cast_to<Camera3D>(m_Head->find_child("Camera"));
-	DEV_ASSERT(m_Camera);
+	m_AnimationTree = Object::cast_to<AnimationTree>(find_child("AnimationTree"));
+	m_Mesh = Object::cast_to<Node3D>(find_child("Mesh"));
 }
 
 void FirstPersonPlayer::_unhandled_input(const godot::Ref<godot::InputEvent>& a_Event) {
@@ -84,6 +88,8 @@ void FirstPersonPlayer::_physics_process(float a_Delta) {
 	UpdateFOV(a_Delta);
 	UpdateBobbing(a_Delta);
 
+	UpdateAnimation(a_Delta);
+
 	move_and_slide();
 }
 
@@ -98,10 +104,11 @@ void FirstPersonPlayer::UpdateBobbing(float a_Delta) {
 
 void FirstPersonPlayer::UpdateCamera(const InputEventMouseMotion& a_Event) {
 	m_Head->rotate_y(-a_Event.get_relative().x * SENSITIVITY);
+	m_Mesh->rotate_y(-a_Event.get_relative().x * 0.005);
 	m_Camera->rotate_x(-a_Event.get_relative().y * SENSITIVITY);
 
 	float rotationX = m_Camera->get_rotation().x;
-	CLAMP(rotationX, Math::deg_to_rad(-40.0), Math::deg_to_rad(60.0));
+	rotationX = CLAMP(rotationX, Math::deg_to_rad(-80.0), Math::deg_to_rad(80.0));
 	m_Camera->set_rotation({rotationX, get_rotation().y, get_rotation().z});
 }
 
@@ -128,6 +135,14 @@ void FirstPersonPlayer::UpdatePosition(float delta) {
 			Math::lerp(static_cast<float>(get_velocity().z), static_cast<float>(direction.z * m_Speed),
 				static_cast<float>(delta * AIR_MOVEMENT))});
 	}
+
+
+	if (!direction.is_zero_approx()) {
+		godot::Vector3 newRotation = m_Mesh->get_rotation();
+		newRotation.y = godot::UtilityFunctions::lerp_angle(
+			newRotation.y, godot::UtilityFunctions::atan2(get_velocity().x, get_velocity().z), LerpValue);
+		m_Mesh->set_rotation(newRotation);
+	}
 }
 
 void FirstPersonPlayer::UpdateFOV(float a_Delta) {
@@ -136,4 +151,25 @@ void FirstPersonPlayer::UpdateFOV(float a_Delta) {
 	m_Camera->set_fov(Math::lerp(m_Camera->get_fov(), targetFOV, a_Delta * FOV_TRANSITION));
 }
 
+void FirstPersonPlayer::UpdateAnimation(float delta) {
+	if (is_on_floor()) {
+		m_AnimationTree->set("parameters/ground_air_transition/transition_request", "grounded");
+
+		if (get_velocity().length() > 0.2f) {
+			if (m_Speed == SPRINT_SPEED) {
+				m_AnimationTree->set("parameters/iwr_blend/blend_amount",
+					UtilityFunctions::lerp(m_AnimationTree->get("parameters/iwr_blend/blend_amount"), 1.0, delta * AnimationBlend));
+			} else {
+				m_AnimationTree->set("parameters/iwr_blend/blend_amount",
+					UtilityFunctions::lerp(m_AnimationTree->get("parameters/iwr_blend/blend_amount"), 0.0, delta * AnimationBlend));
+			}
+		} else {
+			m_AnimationTree->set("parameters/iwr_blend/blend_amount",
+				UtilityFunctions::lerp(m_AnimationTree->get("parameters/iwr_blend/blend_amount"), -1.0, delta * AnimationBlend));
+		}
+	} else {
+		m_AnimationTree->set("parameters/ground_air_transition/transition_request", "air");
+	}
+}
+
 }  // namespace blitz

src/FirstPersonPlayer.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <godot_cpp/classes/animation_tree.hpp>
 #include <godot_cpp/classes/camera3d.hpp>
 #include <godot_cpp/classes/character_body3d.hpp>
 #include <godot_cpp/classes/input_event_mouse_motion.hpp>
@@ -22,8 +23,10 @@ class FirstPersonPlayer : public godot::CharacterBody3D {
 	void _ready();
 
   private:
+	godot::AnimationTree* m_AnimationTree;
 	godot::Camera3D* m_Camera;
 	godot::Node3D* m_Head;
+	godot::Node3D* m_Mesh;
 	float m_BobTime;
 	float m_Speed;
 
@@ -31,6 +34,8 @@ class FirstPersonPlayer : public godot::CharacterBody3D {
 	void UpdateFOV(float delta);
 	void UpdateCamera(const godot::InputEventMouseMotion&);
 	void UpdatePosition(float delta);
+
+	void UpdateAnimation(float delta);
 };
 
 }  // namespace blitz