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87 lines
2.6 KiB
87 lines
2.6 KiB
namespace Oculus.Platform.Samples.VrHoops
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{
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using UnityEngine;
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using System.Collections;
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// This component handles network coordination for moving balls.
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// Synchronizing moving objects that are under the influence of physics
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// and other forces is somewhat of an art and this example only scratches
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// the surface. Ultimately how you synchronize will depend on the requirements
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// of your application and its tolerance for users seeing slightly different
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// versions of the simulation.
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public class P2PNetworkBall : MonoBehaviour
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{
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// the last time this ball locally collided with something
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private float lastCollisionTime;
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// cached reference to the GameObject's Rigidbody component
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private Rigidbody rigidBody;
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void Awake()
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{
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rigidBody = gameObject.GetComponent<Rigidbody>();
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}
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public Vector3 velocity
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{
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get { return rigidBody.velocity; }
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}
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public bool IsHeld()
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{
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return !rigidBody.useGravity;
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}
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public void ProcessRemoteUpdate(float remoteTime, bool isHeld, Vector3 pos, Vector3 vel)
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{
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if (isHeld)
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{
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transform.localPosition = pos;
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}
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// if we've collided since the update was sent, our state is going to be more accurate so
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// it's better to ignore the update
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else if (lastCollisionTime < remoteTime)
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{
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// To correct the position this sample directly moves the ball.
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// Another approach would be to gradually lerp the ball there during
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// FixedUpdate. However, that approach aggravates any errors that
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// come from estimatePosition and estimateVelocity so the lerp
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// should be done over few timesteps.
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float deltaT = Time.realtimeSinceStartup - remoteTime;
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transform.localPosition = estimatePosition(pos, vel, deltaT);
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rigidBody.velocity = estimateVelocity(vel, deltaT);
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// if the ball is transitioning from held to ballistic, we need to
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// update the RigidBody parameters
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if (IsHeld())
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{
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rigidBody.useGravity = true;
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rigidBody.detectCollisions = true;
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}
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}
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}
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// Estimates the new position assuming simple ballistic motion.
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private Vector3 estimatePosition(Vector3 startPosition, Vector3 startVelocty, float time)
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{
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return startPosition + startVelocty * time + 0.5f * Physics.gravity * time * time;
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}
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// Estimates the new velocity assuming ballistic motion and drag.
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private Vector3 estimateVelocity(Vector3 startVelocity, float time)
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{
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return startVelocity + Physics.gravity * time * Mathf.Clamp01 (1 - rigidBody.drag * time);
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}
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void OnCollisionEnter(Collision collision)
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{
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lastCollisionTime = Time.realtimeSinceStartup;
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}
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void OnDestroy()
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{
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PlatformManager.P2P.RemoveNetworkBall(gameObject);
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}
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}
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}
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