71 lines
1.9 KiB
C#
71 lines
1.9 KiB
C#
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using System;
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using Unity.Mathematics;
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using UnityEngine;
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using UnityEngine.Splines;
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namespace Unity.Splines.Examples
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{
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// Visualize the nearest point on a spline to a roving sphere.
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[RequireComponent(typeof(LineRenderer))]
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public class ShowNearestPoint : MonoBehaviour
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{
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// Boundary setup for the wandering sphere
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Vector3 m_Center = Vector3.zero;
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float m_Size = 50f;
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// Store a collection of Splines to test for nearest to our position.
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SplineContainer[] m_SplineContainer;
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LineRenderer m_LineRenderer;
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// This GameObject will be used to visualize the nearest point on the nearest spline to this transform.
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[SerializeField]
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Transform m_NearestPoint;
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void Start()
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{
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if (!TryGetComponent(out m_LineRenderer))
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Debug.LogError("ShowNearestPoint requires a LineRenderer.");
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m_LineRenderer.positionCount = 2;
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m_SplineContainer = FindObjectsOfType<SplineContainer>();
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if (m_NearestPoint == null)
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Debug.LogError("Nearest Point GameObject is null");
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}
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void Update()
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{
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var position = CalculatePosition();
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var nearest = new float4(0, 0, 0, float.PositiveInfinity);
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foreach (var container in m_SplineContainer)
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{
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using var native = new NativeSpline(container.Spline, container.transform.localToWorldMatrix);
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float d = SplineUtility.GetNearestPoint(native, transform.position, out float3 p, out float t);
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if (d < nearest.w)
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nearest = new float4(p, d);
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}
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m_LineRenderer.SetPosition(0, position);
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m_LineRenderer.SetPosition(1, nearest.xyz);
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m_NearestPoint.position = nearest.xyz;
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transform.position = position;
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}
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Vector3 CalculatePosition()
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{
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float time = Time.time * .2f, time1 = time + 1;
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float half = m_Size * .5f;
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return m_Center + new Vector3(
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Mathf.PerlinNoise(time, time) * m_Size - half,
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0,
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Mathf.PerlinNoise(time1, time1) * m_Size - half
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);
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}
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void OnDrawGizmosSelected()
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{
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Gizmos.DrawWireCube(m_Center, new Vector3(m_Size, .1f, m_Size));
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}
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}
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}
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