81 lines
2.9 KiB
C#
81 lines
2.9 KiB
C#
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using System;
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using Unity.XR.CoreUtils;
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using UnityEngine;
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using UnityEngine.Events;
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using UnityEngine.Serialization;
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namespace Unity.VRTemplate
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{
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/// <summary>
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/// Fires events when this object is is within the field of view of the gaze transform. This is currently used to
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/// hide and show tooltip callouts on the controllers when the controllers are within the field of view.
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/// </summary>
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public class CalloutGazeController : MonoBehaviour
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{
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[SerializeField, Tooltip("The transform which the forward direction will be used to evaluate as the gaze direction.")]
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Transform m_GazeTransform;
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[SerializeField, Tooltip("Threshold for the dot product when determining if the Gaze Transform is facing this object. The lower the threshold, the wider the field of view."), Range(0.0f, 1.0f)]
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float m_FacingThreshold = 0.85f;
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[SerializeField, Tooltip("Events fired when the Gaze Transform begins facing this game object")]
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UnityEvent m_FacingEntered;
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[SerializeField, Tooltip("Events fired when the Gaze Transform stops facing this game object")]
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UnityEvent m_FacingExited;
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[SerializeField, Tooltip("Distance threshold for movement in a single frame that determines a large movement that will trigger Facing Exited events.")]
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float m_LargeMovementDistanceThreshold = 0.05f;
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[SerializeField, Tooltip("Cool down time after a large movement for Facing Entered events to fire again.")]
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float m_LargeMovementCoolDownTime = 0.25f;
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bool m_IsFacing;
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float m_LargeMovementCoolDown;
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Vector3 m_LastPosition;
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void Update()
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{
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if (!m_GazeTransform)
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return;
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CheckLargeMovement();
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if (m_LargeMovementCoolDown < m_LargeMovementCoolDownTime)
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return;
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var dotProduct = Vector3.Dot(m_GazeTransform.forward, (transform.position - m_GazeTransform.position).normalized);
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if (dotProduct > m_FacingThreshold && !m_IsFacing)
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FacingEntered();
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else if (dotProduct < m_FacingThreshold && m_IsFacing)
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FacingExited();
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}
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void CheckLargeMovement()
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{
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// Check if there is large movement
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var currentPosition = transform.position;
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var positionDelta = Mathf.Abs(Vector3.Distance(m_LastPosition, currentPosition));
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if (positionDelta > m_LargeMovementDistanceThreshold)
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{
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m_LargeMovementCoolDown = 0.0f;
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FacingExited();
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}
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m_LargeMovementCoolDown += Time.deltaTime;
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m_LastPosition = currentPosition;
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}
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void FacingEntered()
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{
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m_IsFacing = true;
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m_FacingEntered.Invoke();
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}
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void FacingExited()
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{
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m_IsFacing = false;
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m_FacingExited.Invoke();
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}
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}
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}
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