108 lines
3.5 KiB
C#
108 lines
3.5 KiB
C#
using System;
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using Mirror;
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using UnityEngine;
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namespace Mirror.Examples.Billiards
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{
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public class WhiteBall : NetworkBehaviour
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{
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public LineRenderer dragIndicator;
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public Rigidbody rigidBody;
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public float forceMultiplier = 2;
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public float maxForce = 40;
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// remember start position to reset to after entering a pocket
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Vector3 startPosition;
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// cast mouse position on screen to world position
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bool MouseToWorld(out Vector3 position)
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{
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Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
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Plane plane = new Plane(Vector3.up, transform.position);
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if (plane.Raycast(ray, out float distance))
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{
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position = ray.GetPoint(distance);
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return true;
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}
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position = default;
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return false;
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}
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void Awake()
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{
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startPosition = transform.position;
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}
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[ClientCallback]
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void OnMouseDown()
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{
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// enable drag indicator
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dragIndicator.SetPosition(0, transform.position);
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dragIndicator.SetPosition(1, transform.position);
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dragIndicator.gameObject.SetActive(true);
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}
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[ClientCallback]
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void OnMouseDrag()
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{
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// cast mouse position to world
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if (!MouseToWorld(out Vector3 current)) return;
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// drag indicator
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dragIndicator.SetPosition(0, transform.position);
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dragIndicator.SetPosition(1, current);
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}
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// all players can apply force to the white ball.
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// (this is not cheat safe)
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[Command(requiresAuthority = false)]
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void CmdApplyForce(Vector3 force)
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{
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// AddForce has different force modes, see this excellent diagram:
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// https://www.reddit.com/r/Unity3D/comments/psukm1/know_the_difference_between_forcemodes_a_little/
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// when applying a one-time force to the ball, we need 'Impulse'.
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rigidBody.AddForce(force, ForceMode.Impulse);
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}
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[ClientCallback]
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void OnMouseUp()
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{
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// cast mouse position to world
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if (!MouseToWorld(out Vector3 current)) return;
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// calculate delta from ball to mouse
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// ball may have moved since we started dragging,
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// so always use current ball position here.
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Vector3 from = transform.position;
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// debug drawing: only works if Gizmos are enabled!
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Debug.DrawLine(from, current, Color.white, 2);
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// calculate pending force delta
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Vector3 delta = from - current;
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Vector3 force = delta * forceMultiplier;
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// there should be a maximum allowed force
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force = Vector3.ClampMagnitude(force, maxForce);
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// apply force to rigidbody.
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// it will take a round trip to show the effect.
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// the goal for prediction will be to show it immediately.
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CmdApplyForce(force);
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// disable drag indicator
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dragIndicator.gameObject.SetActive(false);
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}
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// reset position when entering a pocket.
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// there's only one trigger in the scene (the pocket).
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[ServerCallback]
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void OnTriggerEnter(Collider other)
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{
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rigidBody.position = startPosition;
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rigidBody.Sleep(); // reset forces
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GetComponent<NetworkRigidbodyUnreliable>().RpcTeleport(startPosition);
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}
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}
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}
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