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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class MovingSphere : MonoBehaviour
{
Rigidbody body;
Renderer renderer;
[SerializeField, Range(0f, 100f)]
float maxSpeed = 10f;
[SerializeField, Range(0f, 100f)]
float maxAcceleration = 10f;
[SerializeField, Range(0f, 100f)]
float maxAirAcceleration = 1f;
Vector3 velocity;
[SerializeField, Range(0f, 10f)]
float jumpHeight = 2f;
[SerializeField, Range(0, 5)]
int maxAirJumps;
bool desiredJump;
int jumpPhase;
int groundContactCount;
bool OnGround => groundContactCount > 0;
Vector3 contactNormal;
// 1.0 means walls
// 0.0 means floors
[SerializeField, Range(0f, 1f)]
float maxJumpAngle = 0.44f;
Vector3 inputVelocity;
void Awake()
{
body = GetComponent<Rigidbody>();
renderer = GetComponent<Renderer>();
}
void Update()
{
Vector2 playerInput = new Vector2(
Input.GetAxis("Horizontal"),
Input.GetAxis("Vertical")
);
playerInput = Vector2.ClampMagnitude(playerInput, 1f);
desiredJump |= Input.GetButtonDown("Jump");
inputVelocity = new Vector3(playerInput.x, 0f, playerInput.y) * maxSpeed;
Color purple = Color.red + Color.blue;
renderer.material.SetColor(
"_BaseColor", purple - (purple * (groundContactCount * 0.33f))
);
}
void FixedUpdate()
{
UpdateState();
AdjustVelocity();
if(desiredJump)
{
desiredJump = false;
Jump();
}
body.velocity = velocity;
ClearState();
}
void ClearState() {
groundContactCount = 0;
contactNormal = Vector3.zero;
}
void UpdateState()
{
velocity = body.velocity;
if(OnGround)
{
jumpPhase = 0;
if(groundContactCount > 1)
contactNormal.Normalize();
}
else
contactNormal = Vector3.up;
}
void Jump()
{
if(OnGround || jumpPhase < maxAirJumps)
{
jumpPhase += 1;
float jumpSpeed = Mathf.Sqrt(-2f * Physics.gravity.y * jumpHeight);
float alignedSpeed = Vector3.Dot(velocity, contactNormal);
if(alignedSpeed > 0f)
jumpSpeed = Mathf.Max(jumpSpeed - alignedSpeed, 0f);
velocity += contactNormal * jumpSpeed;
}
}
void OnCollisionStay(Collision collision) {
EvaluateCollision(collision);
}
void OnCollisionEnter(Collision collision) {
EvaluateCollision(collision);
}
void EvaluateCollision(Collision collision) {
for(int i = 0; i < collision.contactCount; i++)
{
Vector3 normal = collision.GetContact(i).normal;
if(normal.y >= (1f - maxJumpAngle))
{
groundContactCount += 1;
contactNormal += normal;
}
}
}
void AdjustVelocity()
{
Vector3 xAxis = ProjectOnContactPlane(Vector3.right).normalized;
Vector3 zAxis = ProjectOnContactPlane(Vector3.forward).normalized;
Vector3 currentVel = new Vector3(
Vector3.Dot(velocity, xAxis),
0f,
Vector3.Dot(velocity, zAxis)
);
float maxSpeedChange = Time.deltaTime;
if(OnGround)
maxSpeedChange *= maxAcceleration;
else
maxSpeedChange *= maxAirAcceleration;
Vector3 newVel = new Vector3(
Mathf.MoveTowards(currentVel.x, inputVelocity.x, maxSpeedChange),
0f,
Mathf.MoveTowards(currentVel.z, inputVelocity.z, maxSpeedChange)
);
velocity += xAxis * (newVel.x - currentVel.x) + zAxis * (newVel.z - currentVel.z);
}
Vector3 ProjectOnContactPlane(Vector3 vector)
{
return vector - contactNormal * Vector3.Dot(vector, contactNormal);
}
}
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