Physics not working/ Character not fallin

Unity Engine
1

I have a problem with my project. My character is falling down veeeery slowly, Y is -1 like every 10 seconds. The character has attached a rigidbody. His mass is 1. gravity checked, kinematic unchecked. moving around with rigidbody.velocity works just fine. in the settings, gravity force is set to -9.81. Time scale is 1. the animator has apply root motion unchecked. Yet it won’t work, no matter what I do. Here is the script:\

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour {

 

    Rigidbody rb;
    public float movementSpeed;
    public float rotationSpeed;
    Vector3 lookAtVector;
    private float g = 9.81f;
    private float mass;


    Animator anim;

    public Transform cam;
    void Start() {
        lookAtVector = transform.position;
        rb = GetComponent<Rigidbody>();

        rb.constraints = RigidbodyConstraints.FreezeRotationX | RigidbodyConstraints.FreezeRotationZ;

        anim = GetComponent<Animator>();

        mass = rb.mass;
    }

 
    void FixedUpdate() {

        print(transform.position);
        RaycastHit hit;
        if (Physics.Raycast(transform.position, -Vector3.up, out hit))
        {

            print(hit.point);

            Debug.DrawLine(transform.position, hit.point, Color.cyan);
        }

        if(hit.point.y != transform.position.y)
        {
            rb.constraints = rb.constraints | RigidbodyConstraints.FreezeRotationY;
        }
        else
        {
            rb.constraints &= ~RigidbodyConstraints.FreezePositionY;
        }
       


        Move();


    }

    public void Move()
    {


       

        float z = 0;
        float x = 0;
        z = Input.GetAxis("Horizontal");
        x = Input.GetAxis("Vertical");


        //rb.AddForce(new Vector3(0, -1, 0)*g*mass);


        if (z != 0 || x != 0)
        {


            Vector3 direction = new Vector3(x * cam.rotation.x, 0, z * cam.rotation.z);


            Vector3 destination = direction + transform.position;



            lookAtVector = transform.position + direction;



            //rb.MovePosition(transform.position + transform.forward * Time.deltaTime);

            rb.velocity = direction * movementSpeed;
         

            anim.SetFloat("Blend", 1f);




        }
        else
        {
            lookAtVector = transform.position;
            rb.velocity = Vector3.zero;
            anim.SetFloat("Blend", 0);

        }

        if(lookAtVector != null)
            transform.LookAt(lookAtVector);
    }


}
2

My guess is you’re setting the velocity.y to 0 and that cancels any acceleration.
Try something like
rb.velocity = new vector 3(direction.x, rb.velocity.y, direction.z).

Just multiply direction by move speed before that line