adrsch · October 25, 2023 19:59
diff --git a/PlayerController.cs b/PlayerController.cs
 // Copyright (c) .NET Foundation and Contributors (https://dotnetfoundation.org/ & https://stride3d.net) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
 // Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
 /*
 * PARTS OF THIS FILE ARE MODIFICATIONS OF QUAKE 3 CODE UNDER THE FOLLOWING:
 ===========================================================================
 Copyright (C) 1999-2005 Id Software, Inc.

 This file is part of Quake III Arena source code.

 Quake III Arena source code is free software; you can redistribute it
 and/or modify it under the terms of the GNU General Public License as
 published by the Free Software Foundation; either version 2 of the License,
 or (at your option) any later version.

 Quake III Arena source code is distributed in the hope that it will be
 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with Foobar; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 ===========================================================================
 Find the GPL at the bottom.
 */
 using System;
 using System.Diagnostics;
 using BulletSharp;
 using BulletSharp.SoftBody;
 using Silk.NET.Core.Native;
 using Silk.NET.OpenXR;
 using Stride.Core;
 using Stride.Core.Mathematics;
 using Stride.Core.Shaders.Ast;
 using Stride.Engine;
 using Stride.Engine.Events;
 using Stride.Graphics;
 using Stride.Physics;
 using Stride.Rendering.Lights;
 using Int2 = Stride.Core.Mathematics.Int2;
 using MathUtil = Stride.Core.Mathematics.MathUtil;
 using SEQ.Player;
 namespace SEQ
 {
    public static class PhysicsConstants
    {
        public static float Gravity = 800;
        public static float Friction = 5.2f;
        public static float AirControl = 0;
        public static float JumpForce = 260;
        public static bool Autobhop = true;
        public static float Speed = 320;
        public static float Accel = 15;
        public static float StopSpeed = 80;

        public static float AirSpeed = 320;
        public static float AirAccel = 15;
        public static float AirStopSpeed = 80;

        public static float StrafeAccel = 15;

        public static float SprintSpeed = 320;
        public static float SprintAccel = 15;
        public static float SprintStopSpeed = 80;

        public static float CrouchSpeed = 320;
        public static float CrouchAccel = 15;
        public static float CrouchStopSpeed = 80;

        public static float NoclipSpeed = 200;
        public static float NoclipSprint = 400;
        public static float NoclipCrouch = 120;

        public static bool Noclip = false;
    }

    public class PlayerController : SyncScript, ICharacterMovement
    {
        public static PlayerController Inst;
        [Display(category: "Refs")]
        public CharacterComponent Character;
        [Display(category: "Refs")]
        public FpsCamera FPSCam;
        [Display(category: "Refs")]
        public PlayerInput InputManager;
        [DataMemberIgnore]
        public Vector3 CurrentVelocity;
        [DataMemberIgnore]
        public Entity HookEntity;
        [DataMemberIgnore]
        public bool HookActive;

        [Display(category: "Physics")]
        public float GroundedDistance = 16;
        [DataMemberIgnore]
        public bool IsGrounded;
        bool IsStable;
        [DataMemberIgnore]
        public bool IsSlick;
        [DataMemberIgnore]
        public bool IsSwimming;
        [DataMemberIgnore]
        public bool InWater;
        [DataMemberIgnore]
        public bool IsKnockback;
        [DataMemberIgnore]
        public bool IsOnRb;

        [Display(category: "Physics")]
        public float MaxGroundAngle;
        [DataMemberIgnore]
        public Vector3 LocalMove;
        [DataMemberIgnore]
        public Vector3 GroundHitNormal;

        [Display(category: "Events")]
        public EventWrapper LandedEvent = new EventWrapper();
        [Display(category: "Events")]
        public EventWrapper UngroundedEvent = new EventWrapper();

        [Display(category: "Events")]
        public EventWrapper JumpedEvent = new EventWrapper();

        bool JumpQueued;
        float LastJumpedTime;
        const float MinJumpTime = 0.1f;
        const float SameSurfaceThreshold = 0.99f;

        [DataMemberIgnore]
        public Vector3 Velocity => CurrentVelocity.ToXenko();
        [DataMemberIgnore]
        public Vector3 Position => CurrentPosition.ToXenko();


        /*    public Vector3 CharacterPosition
            {
                get => Character?.GetPhysicsPosition() ?? Vector3.zero;
                set => Character?.SetPhysicsPosition(value);
            }*/

        public override void Start()
        {
         //   Inspector.FindFreeInspector(Services).Target = this;
            base.Start();
            Inst = this;
            Character.SetCharacterMovement(this);
        }

        // BAD: Should have proper input support for frame updates
        bool DidCrouchDown;
        public override void Update()
        {
            DidCrouchDown = Keybinds.GetKeyDown(Keybind.Crouch);
            // BAD: lazy move out of physics update
            DoDuck();
            //  Character.ColliderShape.Margin
            DebugText.Print($"{((int)CurrentVelocity.Length())}", new Int2(100, 300));
            DebugText.Print($"Grounded: {IsGrounded} Stable: {IsStable} On Rb: {IsOnRb} WaterLevel: {WaterLevel} Knockback {IsKnockback}", new Int2(100, 320));
            DebugText.Print($"Velocity: {(int)CurrentVelocity.x}, {(int)CurrentVelocity.y}, {(int)CurrentVelocity.z}", new Int2(100, 340));
            DebugText.Print($"Position: {(int)Entity.Transform.WorldPosition.x}, {(int)Entity.Transform.WorldPosition.y}, {(int)Entity.Transform.WorldPosition.z}", new Int2(100, 360));
          //  DebugText.Print($"Physics Position: {Character.GetPhysicsPosition}", new Int2(100, 380));


            if (IsMovementEnabled && Game.Window.Focused)
            {
                {
                    Input.LockMousePosition(true);
                    Game.IsMouseVisible = false;
                }
            }
            else
                Input.UnlockMousePosition();
        }
        public bool GetIsGrounded()
        {
            return IsGrounded;
        }
        BulletSharp.CharacterSweepCallback DoSweep(Vector3 from, Vector3 to, float? addedMargin = null)
        {
           // Character.AddedMargin = addedMargin ?? BaseAddedMargin;
            var sweep = Character.DoSweep(from.ToXenko(), to.ToXenko());
           // Character.AddedMargin = BaseAddedMargin;
            sweep.Point = sweep.Point.FromXenko();
            if (sweep.HitCollisionObject?.UserObject is RigidbodyComponent rb && !rb.IsKinematic && rb.AllowPush)
            {
                rb.Activate(true);
            }
            return sweep;
        }

        public PhysicsComponent GroundCollider;
        public SurfaceType GroundSurface => GroundCollider?.SurfaceType ?? SurfaceType.Default;
        Vector3 surfaceVelocity;

        void GroundSweep(float dt)
        {
            var pos = CurrentPosition;
            var from = Character.PhysicsWorldTransform;
            from.TranslationVector = pos;
            //var transposed = Character.PhysicsWorldTransform;
            //transposed.TranslationVector = pos - GroundedDistance * Vector3.UnitY;
            //  var sweep = Character.GhostSweep(from, transposed, +GroundedDistance * Vector3.UnitY);
            SetSkin(0, -Skin);
            var sweep = DoSweep(pos + Skin * Vector3.UnitY, pos - (GroundedDistance + Skin) * Vector3.UnitY);
            SetSkin(0, 0);
            //var sweep = Character.Simulation.ShapeSweep(Character.ColliderShape, from, transposed);
            GroundHitNormal = sweep.Normal;
            if (!sweep.Succeeded)
            {
                Freefall();
                LeftGroundCheck();
                IsGrounded = false;
                IsStable = false;
                IsOnRb = false;
              //  CurrentVelocity += surfaceVelocity * 0.5f;
                surfaceVelocity = Vector3.zero;
                return;
            }
            else if (GroundHitNormal.y < 0.2f)
            {
                LeftGroundCheck();
                IsGrounded = false;
                IsStable = false;
                IsOnRb = false;
                return;
            }
            GroundCollider = sweep.HitCollisionObject?.UserObject as PhysicsComponent;

            if (GroundCollider is RigidbodyComponent rb)
            {
                IsOnRb = true;
                surfaceVelocity = rb.LinearVelocity.FromXenko();
                CurrentPosition = CurrentPosition + surfaceVelocity * dt;

                Character.SetPhysicsPosition(CurrentPosition.ToXenko());

                Character.ApplyPosition(CurrentPosition.ToXenko(), true, true);

            }
            else
            {
                IsOnRb = false;
             //   CurrentVelocity += surfaceVelocity * 0.5f;
                surfaceVelocity = Vector3.zero;
             //   if (GroundCollider != lastGroundCollider)
              // {
                //  CurrentVelocity += surfaceVelocity * 0.5f;
             // }
            }
            if (CurrentVelocity.y > 0 && Vector3.Dot(CurrentVelocity, GroundHitNormal) > 10)
            {
                LeftGroundCheck();
                IsGrounded = false;
                IsStable = false;
                return;
            }
            if (GroundHitNormal.y < 0.7f)
            {
                LeftGroundCheck();
                IsGrounded = true;
                IsStable = false;
                return;
            }
            if (!IsGrounded)
            {
                LandedEvent?.Invoke(Transform);
                EventManager.Raise(new LandedEvent());
            }
            IsGrounded = true;
            IsStable = true;
        }
        bool CanStand()
        {
            var pos = CurrentPosition;
            var from = Character.PhysicsWorldTransform;
            from.TranslationVector = pos;
         //   var transposed = Character.PhysicsWorldTransform;
            var transposed = pos + height * Vector3.UnitY;
            //  var sweep = Character.GhostSweep(from, transposed, +GroundedDistance * Vector3.UnitY);
            var sweep = DoSweep(pos, transposed);
            //var sweep = Character.Simulation.ShapeSweep(Character.ColliderShape, from, transposed);
            return !sweep.Succeeded;
        }

        void Freefall()
        {
            /*
            if (Time.time + LastJumpedTime >  Time.time || IsGrounded)
            {
                var from = Character.PhysicsWorldTransform;
                from.TranslationVector = CurrentPosition;
                var transposed = Character.PhysicsWorldTransform;
                transposed.TranslationVector = CurrentPosition - 64 * Vector3.UnitY;
                var sweep = Character.GhostSweep(from, transposed);
                if (!sweep.Succeeded)
                {

                }
            }*/
        }

        void LeftGroundCheck()
        {
            //if (IsCrouched)
            //    Uncrouch();
            if (IsGrounded)
                UngroundedEvent?.Invoke(Transform);
        }

        bool IsCrouched;
        // BAD: hardcoded...
        const float height = 48f;
        const float radius = 16f;
        const float cameraOffset = 23f; // 46 / 2
        void DoDuck()
        {
            if (IsCrouched && DidCrouchDown)
            {
                Uncrouch();
            }
            else if (!IsCrouched && DidCrouchDown)
            {
                Crouch();
            }
            // BAD: this is hack
            DidCrouchDown = false;
        }

        float currentHeightSkin = 0;
        float currentRadiusSkin = 0;
        void SetSkin(float heightSkin, float radiusSkin)
        {
            if (heightSkin == currentHeightSkin && radiusSkin == currentRadiusSkin)
                return;

            Character.ColliderShape = new CylinderColliderShape(
                currentHeight + heightSkin.ToXenko(),
                currentRadius + radiusSkin.ToXenko(),
                ShapeOrientation.UpY);
            Character.UpdateShape();
        }

        void Crouch()
        {
            //Character.ColliderShape.Scaling = new Vector3(1, 0.5f, 1);
         Character.ColliderShape = new CylinderColliderShape(
                2.4f,
                radius.ToXenko(),
                ShapeOrientation.UpY);
            //   Character.ColliderShape = new SphereColliderShape( false,
            // radius.ToXenko());
            //   {
            //     LocalOffset = new Vector3(0, 1.2f, 0)
            //   };

            currentHeight = 2.4f;
            currentRadius = radius.ToXenko();

        Character.UpdateShape();
            Character.SetPhysicsPosition(Character.GetPhysicsPosition().FromXenko() + new BulletSharp.Math.Vector3(0, 1, 0)  * (height / 2).ToXenko());
            Character.UpdatePhysicsTransformation(true);
            FPSCam.Entity.Transform.Position.y = 1f; // 1f = (2.4 / 2) - 0.2f
            IsCrouched = true;
        }
        float currentHeight = 4.8f;
        float currentRadius = 1.6f;
        void Uncrouch()
        {
            if (!CanStand())
                return;
            //  Character.ColliderShape.Scaling = new Vector3(1, 1, 1);

            Character.ColliderShape = new CylinderColliderShape(
                (height).ToXenko(),
                radius.ToXenko(),
                ShapeOrientation.UpY);
            //   {
            //    LocalOffset = new Vector3(Character.GetPhysicsPosition().X, Character.GetPhysicsPosition().Y + 2.4f, Character.GetPhysicsPosition().Z)
            // };
            currentHeight = (height).ToXenko();
            currentRadius = (radius).ToXenko();
            Character.UpdateShape();
            //CurrentPosition += Vector3.up * (height / 2).ToXenko();
             Character.SetPhysicsPosition(Character.GetPhysicsPosition().FromXenko() + new BulletSharp.Math.Vector3(0, 1, 0) * (height / 2).ToXenko());

            Character.UpdatePhysicsTransformation(true);
            FPSCam.Entity.Transform.Position.y = 2.2f; // 4.6 - 2.4
            IsCrouched = false;
        }

        public void OnReset()
        {

        }

        void Unstick()
        {

        }

        Vector3 LastPosition;
        Vector3 LastLastPosition;
        Vector3 LastLastLastPosition;

        public event System.Action AfterPhysicsUpdate;
        public void OnPhysicsUpdate(float deltaTime)
        {
           Character.SetUseGhost(true);
            // Character.ColliderShape.Margin = 0f;
            HitSpeed = 0;
            CurrentVelocity = Character.GetPhysicsVelocity().FromXenko();//Units.ToQuake(velocity);
                                       //  CurrentVelocity = velocity;//Units.ToQuake(velocity);
            CurrentPosition = Character.GetPhysicsPosition().FromXenko();//character.PhysicsWorldTransform.TranslationVector;

            if (LastPosition == CurrentPosition && CurrentVelocity.Magnitude > 10)
            {
                CurrentPosition = LastLastLastPosition;
                ApplyPosition(CurrentPosition, deltaTime);
                Logger.Log(Channel.Gameplay, LogPriority.Error, $"Stuck detected!");
            }
            LastLastLastPosition = LastLastPosition;
            LastLastPosition = LastPosition;
            LastPosition = CurrentPosition;
            JumpQueued = IsMovementEnabled && Keybinds.GetKey(Keybind.Jump);
            LocalMove = IsMovementEnabled ? InputManager.GetMoveDir() : Vector3.zero;

            if (PhysicsConstants.Noclip)
            {
                var wishdir = Utils.LogicDirectionToWorldDirection(new Vector2(LocalMove.X, LocalMove.Z), PlayerCamera.Inst.Camera, FPSCam.Transform.Up);

                CurrentVelocity = GetCurrentMaxSpeed() * wishdir;
                CurrentPosition = CurrentPosition + CurrentVelocity * deltaTime;

                Character.SetPhysicsPosition(CurrentPosition.ToXenko());
                Character.SetPhysicsVelocity(CurrentVelocity.ToXenko());  
                return;
            }
            GroundSweep(deltaTime);

         //   DoDuck();

            if (HookActive)
            {
                var hookBindPos = (FPSCam.Transform.GetWorldPosition().FromXenko() - 0.2f * Vector3.UnitY);
                var wishdir = HookEntity.Transform.GetWorldPosition().FromXenko() - hookBindPos;


                //    if (Vector3.Angle(new Vector3(wishdir.x, 0, wishdir.z), wishdir) > 45f)
                IsGrounded = false;
                IsStable = false;



                var speed = HookFriction(deltaTime);
                CurrentVelocity += wishdir.Normalized * speed;
            }


            if (WaterLevel > 1)
            {
                var wishdir = Utils.LogicDirectionToWorldDirection(new Vector2(LocalMove.X, LocalMove.Z), PlayerCamera.Inst.Camera, Vector3.UnitY);
                if (!HookActive)
                    CurrentVelocity = 150f * TransformToViewDirection(wishdir);//inputHandler.FPCamera.transform.TransformDirection(wishdir);

                //     currentVelocity = Units.ToUnity(150f) * transform.TransformDirection(wishdir);//inputHandler.FPCamera.transform.TransformDirection(wishdir);

                /*  var wave = Mathf.Sin(5f * Time.time);
                  if (transform.position.y <= -10.3)
                      currentVelocity.y = 1f;
                  else if (wave < 0)
                      currentVelocity.y = wave;*/
            }
            else if (IsStable)
            {

                GroundMove(deltaTime);
            }
            else
            {
                AirMove(deltaTime, false);
            }

        //    ApplyPosition(CurrentPosition, deltaTime);

            //TODO: remove this probably
            //  GroundSweep();
            WasGrounded = IsGrounded;

 //            Character.SetPhysicsPosition(CurrentPosition.ToXenko());
  //          Character.SetPhysicsVelocity(CurrentVelocity.ToXenko());

            Character.ApplyPosition(CurrentPosition.ToXenko(), true, true);
       //     Character.RecoverFromPenetration();
            CurrentVelocity = Character.GetPhysicsVelocity().FromXenko();
            CurrentPosition = Character.GetPhysicsPosition().FromXenko();
            AfterPhysicsUpdate?.Invoke();
        }

        bool WasGrounded;
        public bool IsMovementEnabled => GameStateManager.Inst.Active.GetInteractionState() == InteractionState.World;
        // Handle air movement.

        private void AirMove(float dt, bool jumped)
        {

            ApplyFriction(dt);
            float accel = PhysicsConstants.AirAccel;

            var forward = FPSCam.Transform.Forward;
            var right = FPSCam.Transform.Right;

            forward.y = 0;
            right.y = 0;

            forward.Normalize();
            right.Normalize();

            var wishdir = forward * LocalMove.z + right * LocalMove.x;
            wishdir.y = 0;
            var wishspeed = wishdir.Magnitude;
            wishspeed *= (jumped ? PhysicsConstants.JumpForce : PhysicsConstants.AirSpeed);

            //  if (wishdir.magnitude > 1f)
            wishdir.Normalize();
            //m_MoveDirectionNorm = wishdir;

            // CPM Air control.
            float wishspeed2 = wishspeed;
            /*
            if (Vector3.Dot(CurrentVelocity, wishdir) < 0)
            {
                accel = PhysicsConstants.Inst.AirStopSpeed;
            }
            else
            {
                accel = PhysicsConstants.Inst.AirAccel;
            }
            */

            // If the player is ONLY strafing left or right
            if (IsMovementEnabled && (LocalMove.Z == 0 && LocalMove.X != 0))
            {
                //     if (wishspeed > Settings.Strafe.MaxSpeed && UseMaxStrafeSpeed)
                //    {
                //       wishspeed = Settings.Strafe.MaxSpeed;
                //  }

                accel = PhysicsConstants.StrafeAccel;
            }

            Accelerate(wishdir, wishspeed, accel, dt);

            if (PhysicsConstants.AirControl > 0)
            {
                AirControl(wishdir, wishspeed2, dt);
            }
            // Apply gravity
            //  CurrentVelocity.Y -= PhysicsConstants.Gravity * dt;
            if (IsGrounded)
                CurrentVelocity = ProjectToNormal(CurrentVelocity, GroundHitNormal);
            StepSlideMove(true, dt);
        }

        // Air control occurs when the player is in the air, it allows players to move side 
        // to side much faster rather than being 'sluggish' when it comes to cornering.
        private void AirControl(Vector3 targetDir, float targetSpeed, float dt)
        {
            // Only control air movement when moving forward or backward.
            if (!IsMovementEnabled || (MathF.Abs(LocalMove.Z) < 0.001 || MathF.Abs(targetSpeed) < 0.001))
            {
                return;
            }

            float zSpeed = CurrentVelocity.Y;
            CurrentVelocity.Y = 0;
            /* Next two lines are equivalent to idTech's VectorNormalize() */
            float speed = CurrentVelocity.Length();
            CurrentVelocity.Normalize();

            //m_AirControl = 0f;
            float dot = Vector3.Dot(CurrentVelocity, targetDir);
            float k = 32;
            k *= PhysicsConstants.AirControl * dot * dot * dt;

            // Change direction while slowing down.
            if (dot > 0)
            {
                CurrentVelocity.X = CurrentVelocity.X * speed + targetDir.X * k;
                CurrentVelocity.Y = CurrentVelocity.Y * speed + targetDir.Y * k;
                CurrentVelocity.Z = CurrentVelocity.Z * speed + targetDir.Z * k;

                CurrentVelocity.Normalize();
                //m_MoveDirectionNorm = m_CharacterVelocity;
            }

            CurrentVelocity.X *= speed;
            CurrentVelocity.Y = zSpeed; // Note this line
            CurrentVelocity.Z *= speed;
        }
        void Jump()
        {
            if (IsCrouched)
                Uncrouch();
            IsGrounded = false;
            IsStable = false;
            IsOnRb = false;
            LastJumpedTime = Time.time;
            JumpedEvent?.Invoke(Transform);
            EventManager.Raise(new JumpedEvent());
            CurrentVelocity.Y = PhysicsConstants.JumpForce;
            if (!PhysicsConstants.Autobhop)
                JumpQueued = false;
        }

        Vector3 TransformToViewDirection(Vector3 input)
        {
            //       return  Entity.Transform.TransformDirection(input);
            return Utils.LogicDirectionToWorldDirection(input, PlayerCamera.Inst.Camera, Vector3.UnitY);
        }

        float GetCurrentMaxSpeed()
        {
            if (PhysicsConstants.Noclip)
            {

                if (Keybinds.GetKey(Keybind.Sprint))
                    return PhysicsConstants.NoclipSprint;
                if (IsCrouched)
                    return PhysicsConstants.NoclipCrouch;
                return PhysicsConstants.NoclipSpeed;
            }
            if (Keybinds.GetKey(Keybind.Sprint))
                // BAD: should add crouchsprint state
                return IsCrouched ? 0.5f * PhysicsConstants.CrouchSpeed : PhysicsConstants.SprintSpeed;
            if (IsCrouched)
                return PhysicsConstants.CrouchSpeed;
            return PhysicsConstants.Speed;
        }

        float GetGroundAccel()
        {
            if (IsCrouched)
                return PhysicsConstants.CrouchAccel;
            if (Keybinds.GetKey(Keybind.Sprint))
                return PhysicsConstants.SprintAccel;
            return PhysicsConstants.Accel;
        }
        float GetCurrentStopSpeed()
        {
            if (IsCrouched)
                return PhysicsConstants.CrouchStopSpeed;
            if (Keybinds.GetKey(Keybind.Sprint))
                return PhysicsConstants.SprintStopSpeed;
            return PhysicsConstants.StopSpeed;
        }

        public float WaterLevel;

        void WaterMove(float dt)
        {

        }

        const int YAW = 1;
        const int PITCH = 0;
        const int ROLL = 2;
        [Display(category: "Physics")]
        public float Skin = 0f;//0.001f;
        [Display(category: "Physics")]
        public float Margin = 0.25f;
        [Display(category: "Physics")]
        public float BaseAddedMargin = 0.02f;
        void AngleVectors(Vector3 angles, out Vector3 forward, out Vector3 right, out Vector3 up)
        {
            float angle;
            float sr, sp, sy, cr, cp, cy;

            angle = angles[YAW] * MathUtil.Deg2Rad;
            sy = MathF.Sin(angle);
            cy = MathF.Cos(angle);
            angle = angles[PITCH] * MathUtil.Deg2Rad;
            sp = MathF.Sin(angle);
            cp = MathF.Cos(angle);
            angle = angles[ROLL] * MathUtil.Deg2Rad;
            sr = MathF.Sin(angle);
            cr = MathF.Cos(angle);

            forward = new Vector3(
                cp * cy,
                cp * sy,
                -sp);

            right = new Vector3(
                (-1 * sr * sp * cy + -1 * cr * -sy),
                (-1 * sr * sp * sy + -1 * cr * cy),
                -1 * sr * cp);

            up = new Vector3(
                (cr * sp * cy + -sr * -sy),
                (cr * sp * sy + -sr * cy),
                cr * cp);
        }

        private void GroundMove(float dt)
        {
            //  if (WaterLevel > 2 && DotProduct(pml.forward, pml.groundTrace.plane.normal) > 0)
            if (WaterLevel > 2 && FPSCam.Transform.Forward.Dot(GroundHitNormal) > 0)
            {
                // begin swimming
                WaterMove(dt);
                return;
            }
            if (JumpQueued && Time.time > LastJumpedTime + MinJumpTime)
            {
                if (!WasGrounded)
                {
                    var v = CurrentVelocity.Length();
                    CurrentVelocity = ProjectToNormal(CurrentVelocity, GroundHitNormal);
                    CurrentVelocity.Normalize();
                    CurrentVelocity *= v;
                }
                if (WaterLevel > 1)
                    WaterMove(dt);
                else
                {
        //            if (WasGrounded)
          //          {
            //            CurrentVelocity = Clip(CurrentVelocity, GroundHitNormal);
              //      }
                    Jump();
                    AirMove(dt, true);
                }
                return;
            }
          //  if (IsGrounded && IsStable)
         //       CurrentVelocity.Y = 0;

            ApplyFriction(dt);

            var forward = FPSCam.Transform.Forward;
            var right = FPSCam.Transform.Right;

            forward.y = 0;
            right.y = 0;

            forward = ProjectToNormal(forward, GroundHitNormal).Normalized;
            right = ProjectToNormal(right, GroundHitNormal).Normalized;

            var wishdir = forward * LocalMove.z + right * LocalMove.x;

            var wishspeed = wishdir.Magnitude;
            wishspeed *= GetCurrentMaxSpeed();

            if (WaterLevel > 0)
            {
                var waterScale = WaterLevel / 3f;
                waterScale = 1 - (0.5f) * waterScale;
                if (wishspeed > GetCurrentMaxSpeed() * waterScale)
                {
                    wishspeed = wishspeed * GetCurrentMaxSpeed() * waterScale;
                }
            }

            var accel = GetGroundAccel();
            if (CurrentVelocity.Dot(wishdir) < 0)
                accel = GetCurrentStopSpeed();

          if (InputManager.IsCancelling())
            {
                accel = GetCurrentStopSpeed();
                accel *= 2;
                 if( CurrentVelocity.Magnitude < 150f)
                    accel *= 5;
            }

            if (IsSlick || IsKnockback)
                accel = PhysicsConstants.AirAccel;

            Accelerate(wishdir, wishspeed, accel, dt);


            if (!IsStable || IsKnockback)
            {

                CurrentVelocity.Y -= PhysicsConstants.Gravity * dt;
            }

            var vel = CurrentVelocity.Length();
            //          var vel = CurrentVelocity.Length();
            //       CurrentVelocity = Clip(CurrentVelocity, GroundHitNormal);
            //    CurrentVelocity.Normalize();
            //  CurrentVelocity *= vel;

            // TODO: this looks iffy
          /*  if (CurrentVelocity.x == 0 && CurrentVelocity.z == 0)
            {
                CurrentVelocity = Vector3.zero;
                return;
            }*/

           StepSlideMove(false, dt);

        }
        [Display(category: "Physics")]
        public float StopMovingThreshold = 10f;
        [Display(category: "Physics")]
        public float StepHeight = 0.5f;
        void StepSlideMove(bool gravity, float dt)
        {
            var pos = CurrentPosition;
            var vel = CurrentVelocity;
            if (!TryMove(gravity, dt)) return;

            var from = Character.PhysicsWorldTransform;
            from.TranslationVector = pos;

            var down = Character.PhysicsWorldTransform;
            var downTarget = pos - Vector3.up * StepHeight;
            down.TranslationVector = downTarget;
            //var sweep = Character.GhostSweep(from, down, pos - downTarget);
            var sweep = DoSweep(pos, downTarget);
            //  var sweep = Character.Simulation.ShapeSweep(Character.ColliderShape, from, down);
            var hitFraction = sweep.HitFraction;
            if (CurrentVelocity.y > 0 && (hitFraction >= 1f || sweep.Normal.Dot(Vector3.up) < 0.7f))
            {
                return;
            }

            var preStepPos = CurrentPosition;
            var preStepVel = CurrentVelocity;

            from = Character.PhysicsWorldTransform;
            from.TranslationVector = pos;
            var up = Character.PhysicsWorldTransform;
            var upTarget = pos + Vector3.up * StepHeight;
            up.TranslationVector = upTarget;
            //    sweep = Character.GhostSweep(from, up, pos - upTarget);
            sweep = DoSweep(pos, upTarget, BaseAddedMargin);

                //sweep = Character.Simulation.ShapeSweep(Character.ColliderShape, from, up);
            hitFraction = sweep.HitFraction;
            //     if (hitFraction < float.Epsilon)
            //   {
            //     return;
            // }

            var hitPoint = Vector3.Lerp(pos, upTarget, hitFraction);

            var dist = hitPoint.y - pos.y;
            ApplyPosition(hitPoint, dt);
            // CurrentPosition = sweep.Point;
            CurrentVelocity = vel;

            TryMove(gravity, dt);

            from = Character.PhysicsWorldTransform;
            from.TranslationVector = CurrentPosition;
            var correct = Character.PhysicsWorldTransform;
            var correctTarget = CurrentPosition - Vector3.up * dist;
            correct.TranslationVector = correctTarget;
            //sweep = Character.GhostSweep(from, correct, CurrentPosition - correctTarget);
            sweep = DoSweep(CurrentPosition, correctTarget, BaseAddedMargin);
            // sweep = Character.Simulation.ShapeSweep(Character.ColliderShape,from , correct);
            hitFraction = sweep.HitFraction;
            hitPoint = Vector3.Lerp(CurrentPosition, correctTarget, hitFraction);

            /*  var hitFraction = Vector3.Distance(from.TranslationVector, sweep.Point) /
      Vector3.Distance(from.TranslationVector, correct.TranslationVector);
            */
            //     if (!sweep.Succeeded)
            //      CurrentPosition = hitPoint;

            if (sweep.Succeeded)
            {
                CurrentVelocity = ProjectToNormal(CurrentVelocity, sweep.Normal);
                if (sweep.Normal.Y < 0.7f)
                {
                    CurrentVelocity = preStepVel;
                    CurrentPosition = preStepPos;
                    ApplyPosition(preStepPos, dt);
                }
                else
                {
                    ApplyPosition(hitPoint, dt);
                }
            }
            else
            {
                ApplyPosition(hitPoint, dt);
            }
        }

        const int maxSteps = 4;
        Vector3 CurrentPosition;
        float HitSpeed;

        Vector3 VectorMA(Vector3 va, float scale, Vector3 vb)
        {
            return new Vector3(va.x + scale * vb.x, va.y + scale * vb.y, va.z + scale * vb.z);
        }

        void ApplyPosition(Vector3 position, float dt)
        {
            CurrentPosition = position;
            Character.SetPhysicsPosition(CurrentPosition.ToXenko());
            Character.SetPhysicsVelocity(CurrentVelocity.ToXenko());
            Character.ApplyPosition(CurrentPosition, true, true);

         //   Character.SweepAndSlide(x => Clip(Character.GetPhysicsVelocity(), x), dt);
           // CurrentVelocity = Character.GetPhysicsVelocity();
         //   CurrentPosition = Character.GetPhysicsPosition();
            //       Character.UpdatePhysicsTransformation(true);
            //  Character.Transform.WorldPosition(true);
        }
        bool TryMove(bool gravity, float dt)
        {
            Character.SetPhysicsPosition(CurrentPosition);
            var pv = CurrentVelocity;
            var endVelocity = Vector3.zero;

            if (gravity)
            {
                endVelocity = CurrentVelocity;
                endVelocity.y -= PhysicsConstants.Gravity * dt;
                CurrentVelocity.y = 0.5f * (CurrentVelocity.y + endVelocity.y);
                pv.y = endVelocity.y;
                if (IsGrounded)
                {
                    ProjectToNormal(CurrentVelocity, GroundHitNormal);
                }
            }

            Vector3[] surfaces = new Vector3[maxSteps + 1];
            RigidbodyComponent[] rbs = new RigidbodyComponent[maxSteps + 1];
            var surfaceCount = 0;
            if (IsGrounded)
            {
                surfaces[0] = GroundHitNormal;
                surfaceCount = 1;
            }

            surfaces[surfaceCount] = CurrentVelocity.Normalized;
            surfaceCount++;

            
            var remaining = dt;
            var step = 0;
            for (step = 0; step < maxSteps; step++)
            {
                //   var targetPosition = CurrentPosition + remaining * CurrentVelocity;
                var targetPosition = VectorMA(CurrentPosition, remaining, CurrentVelocity);
                var from = Character.PhysicsWorldTransform;
                from.TranslationVector = CurrentPosition;
                var to = Character.PhysicsWorldTransform;
                to.TranslationVector = targetPosition;
                var sweep = DoSweep(CurrentPosition, targetPosition);
                //var sweep = Character.GhostSweep(from, to, CurrentPosition - targetPosition);
                //var sweep = Character.Simulation.ShapeSweep(Character.ColliderShape, from, to);
                // var hitFraction = Vector3.Distance(CurrentPosition, sweep.Point) / Vector3.Distance(CurrentPosition, targetPosition);
                var hitFraction = sweep.HitFraction;
                //     if (hitFraction < float.Epsilon)
                //   {
                //     CurrentVelocity.y = 0;
                //     return true;
                // }
                var positionBeforeApply = CurrentPosition;
                // if (hitFraction > 0)
                    //   ApplyPosition(Vector3.Lerp(CurrentPosition, targetPosition, hitFraction - Skin), remaining);

                //hitFraction = Vector3.Distance(positionBeforeApply, CurrentPosition)  / Vector3.Distance(positionBeforeApply, targetPosition);

                if (!sweep.Succeeded)
                {
                    ApplyPosition(targetPosition, dt);
                    break;
                }

                if (sweep.HitCollisionObject?.UserObject is RigidbodyComponent rb && !rb.IsKinematic && rb.AllowPush)
                {
                    var applyForce = true;
                    foreach (var a in rbs) { if (a == rb) { applyForce = false; break; } }
                    if (applyForce)
                    {
                        rb.Activate(true);
                        rb.ApplyImpulse(CurrentVelocity.ToXenko() * 0.05f / rb.Mass);
                        //,
                          //  rb.Transform.WorldToLocal(sweep.Point));
                        rbs[step] = rb;
                    }
                }

                //since we aren't actually moving if there's any hit, remaining will always be the full amount 
                //remaining -= remaining * hitFraction;
                if (surfaceCount >= maxSteps)
                {
                    break;
                    //   CurrentVelocity = Vector3.zero;
                    // Logger.Log(Channel.Gameplay, LogPriority.Error, "Couldn't solve move");
                    //return true;
                }
                var i = 0;
                for (i = 0; i < surfaceCount; i++)
                {
                    if (sweep.Normal.Dot(surfaces[i]) > 0.99f)
                    {
                        CurrentVelocity += new Vector3(sweep.Normal.X, sweep.Normal.Y, sweep.Normal.Z);
                        break;
                    }
                }
                if (i < surfaceCount) continue;

                surfaces[surfaceCount] = sweep.Normal;
                surfaceCount++;

                for (i = 0; i < surfaceCount; i++)
                {
                    var into = CurrentVelocity.Dot(surfaces[i]);
                    if (into >= 0.1)
                        continue;
                    if (-into > HitSpeed)
                    {
                        HitSpeed = -into;
                    }

                    var clipVel = ProjectToNormal(CurrentVelocity, surfaces[i]);
                    var clipEnd = ProjectToNormal(endVelocity, surfaces[i]);

                    for (var j = 0; j < surfaceCount; j++)
                    {
                        if (j == i) continue;
                        if (clipVel.Dot(surfaces[j]) >= 0.1) continue;

                        clipVel = ProjectToNormal(clipVel, surfaces[j]);
                        clipEnd = ProjectToNormal(clipEnd, surfaces[j]);

                        if (clipVel.Dot(surfaces[i]) >= 0)
                            continue;

                        var dir = Vector3.Cross(surfaces[i], surfaces[j]).Normalized;
                        var d = dir.Dot(CurrentVelocity);
                        clipVel = dir * d;
                        d = dir.Dot(endVelocity);
                        clipEnd = dir * d;

                        for (var k = 0; k < surfaceCount; k++)
                        {
                            if (k == i || k == j) continue;
                            if (clipVel.Dot(surfaces[k]) >= 0.1) continue;

                            CurrentVelocity = Vector3.zero;
                            return true;
                        }
                    }

                    CurrentVelocity = clipVel;
                    endVelocity = clipEnd;
                    break;
                }
            }
                
            if (gravity)
            CurrentVelocity = endVelocity;

 //            CurrentVelocity = Character.GetPhysicsVelocity();
  //          CurrentPosition = Character.GetPhysicsPosition();
            Character.SetPhysicsPosition(CurrentPosition.ToXenko());
            Character.SetPhysicsVelocity(CurrentVelocity.ToXenko());
            //   CurrentVelocity = pv;
            //return !hitAnything;
            return step != 0;
        }

        Vector3 ProjectToNormal(Vector3 u, Vector3 v)
        {
            var backoff = Vector3.Dot(u, v);
            if (backoff < 0)
            {
                backoff *= 1.001f;
            }
            else
            {
                backoff /= 1.001f;
            }

            var change = v * backoff;
            return new Vector3(
                   u.x - change.x,
                   u.y - change.y,
                   u.z - change.z);
        }
        private void ApplyFriction(float dt)
        {
            var vec = CurrentVelocity;

            if (IsStable)
                vec.y = 0;

            float speed = vec.Length();
            if (speed < 1)
            {
                CurrentVelocity.x = 0;
                CurrentVelocity.z = 0;
                return;
            }

            float drop = 0;

            if (WaterLevel <= 1
                && IsStable
                && !IsSlick
                && !IsKnockback)
            {
                float control = ((float)(speed) < GetCurrentStopSpeed()) ? ((float)GetCurrentStopSpeed()) : speed;
                drop = control * PhysicsConstants.Friction * dt;
            }

            if (WaterLevel > 0)
                drop += speed * WaterLevel * dt;

            float newSpeed = speed - drop;
            if (newSpeed < 0)
            {
                newSpeed = 0;
            }

            newSpeed /= speed;

            CurrentVelocity.X *= newSpeed;
            CurrentVelocity.Y *= newSpeed;
            CurrentVelocity.Z *= newSpeed;
        }

        private float HookFriction(float dt)
        {
            // Equivalent to VectorCopy();
            Vector3 vec = CurrentVelocity;
            vec.Y = 0;
            //  float speed = Units.ToUnity(800f);
            float speed = 1200f;
            float drop = 0;

            // Only apply friction when grounded.
            if (GetIsGrounded() && Vector3.Distance(Transform.GetWorldPosition().FromXenko(), HookEntity.Transform.GetWorldPosition().FromXenko()) < 8f)
            {
                var amount = 1f - Stride.Core.Mathematics.MathUtil.Clamp01((Vector3.Distance(Transform.GetWorldPosition(), HookEntity.Transform.GetWorldPosition()).FromXenko() - 3f) / 5f);
                //float control = speed < m_GroundSettings.Deceleration ? m_GroundSettings.Deceleration : speed;
                drop = 15f * PhysicsConstants.Friction * dt * amount;
            }
            float newSpeed = speed - drop;
            //m_PlayerFriction = newSpeed;
            if (newSpeed < 0)
            {
                newSpeed = 0;
            }

            if (speed > 0)
            {
                newSpeed /= speed;
            }
            CurrentVelocity.X *= newSpeed;
            CurrentVelocity.Z *= newSpeed;


            return (10f + PhysicsConstants.Gravity * dt) * Stride.Core.Mathematics.MathUtil.Clamp01(Vector3.Distance(Transform.GetWorldPosition(), HookEntity.Transform.GetWorldPosition()).FromXenko() / 5.0f);


        }
        public BhopData BhopData = new BhopData();
        public Vector3 FeetWorld => Transform.GetWorldPosition() - Vector3.up * currentHeight * 0.5f;
        // const bool UseVector3CV = false; // not sure what does, was set to default true but the conroller had it false
        private void Accelerate(Vector3 wishdir, float wishspeed, float accel, float dt)
        {
            var beforeAccel = CurrentVelocity;
            var currentspeed = Vector3.Dot(CurrentVelocity, wishdir);

            float addspeed = wishspeed - currentspeed;

            if (BhopData.AddSpeed == 0)
            {
                BhopData.Angle = CurrentVelocity.Angle(wishdir);
                BhopData.LastVelocity = CurrentVelocity.Length();
                BhopData.AccelSpeed = accel * dt * wishspeed;
                BhopData.TargetSpeed = wishspeed;
            }
            BhopData.DidUpdate = true;

            if (addspeed <= 0)
            {
                return;
            }

            float accelspeed = accel * dt * wishspeed;
            if (accelspeed > wishspeed) accelspeed = addspeed;

            CurrentVelocity.X += accelspeed * wishdir.X;
            CurrentVelocity.Y += accelspeed * wishdir.Y;
            CurrentVelocity.Z += accelspeed * wishdir.Z;


            if (accelspeed > BhopData.AddSpeed)
            {
                BhopData.Angle = CurrentVelocity.Angle(wishdir);
                BhopData.AddSpeed = addspeed;
                BhopData.AccelSpeed = accelspeed;
                BhopData.LastVelocity = CurrentVelocity.Length();
                BhopData.TargetSpeed = wishspeed;
            }

            if (IsGrounded && GroundCollider is RigidbodyComponent rb
                && CurrentVelocity.Magnitude > beforeAccel.Magnitude)
            {
                if (rb.IsSphere())
                {
                    var delta = CurrentVelocity - beforeAccel;
                    CurrentVelocity = beforeAccel;
                    rb.LinearVelocity += delta.ToXenko();
                }
                else if (rb.IsCylinder(out var axis))
                {
                    var delta = CurrentVelocity - beforeAccel;
                    var flat = new Vector3(delta.x, 0, delta.z);
                    // CurrentVelocity = beforeAccel;
                    var ang = Vector3.Angle(axis, flat);
                    // 
                    //     rb.LinearVelocity += flat.ToXenko();
                    if (ang < 150 && ang > 60 && Vector3.Angle(axis, Vector3.up) > 45)
                    {

                        rb.Activate(true);
                        var flatClipped = flat.Normalized * MathF.Min(flat.Magnitude * 0.5f, 50f);
                        rb.ApplyImpulse(flatClipped.ToXenko(), FeetWorld - rb.Transform.WorldPosition);
                        if (flat.Magnitude * 0.5f < 50f)
                        {
                            CurrentVelocity = Vector3.Lerp(
                                CurrentVelocity,
                                new Vector3(beforeAccel.x, CurrentVelocity.y, beforeAccel.z),
                                0.5f);
                        }
                        else
                        {
                            CurrentVelocity = CurrentVelocity.Normalized * (CurrentVelocity.Magnitude - 50f);
                        }
                    }
               //     rb.AngularVelocity += (axis.Cross(CurrentVelocity).y < 0 ? 1 : -1)
                 //     * axis.Normalized * delta.Magnitude.ToXenko() * 0.3f;

                }
            }
        }
    }
 }

 /*
 * THE QUAKE 3 CODE IS LICENSED UNDER THE FOLLOWING:
 * 		    GNU GENERAL PUBLIC LICENSE
 		       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

 			    Preamble

  The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
 License is intended to guarantee your freedom to share and change free
 software--to make sure the software is free for all its users.  This
 General Public License applies to most of the Free Software
 Foundation's software and to any other program whose authors commit to
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  When we speak of free software, we are referring to freedom, not
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  To protect your rights, we need to make restrictions that forbid
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 		    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

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 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.

 		     END OF TERMS AND CONDITIONS
 */
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