90 lines
2.5 KiB
C#
90 lines
2.5 KiB
C#
using UnityEngine;
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using System.Collections.Generic;
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[ExecuteAlways] // 允许在编辑器非运行状态下预览效果
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public class HeatMapEmitter : MonoBehaviour
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{
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[Header("热源列表")]
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public List<Transform> heatSources = new List<Transform>(); // 拖入多个热源物体
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[Header("热力设置")]
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public float heatRadius = 5f;
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public AnimationCurve heatFalloff = AnimationCurve.EaseInOut(0, 1, 1, 0);
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[Header("颜色设置")]
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public Color coldColor = new Color(0, 0, 0.5f, 1); // 深蓝
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public Color hotColor = Color.red;
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private MeshFilter meshFilter;
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private Mesh mesh;
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private Vector3[] baseVertices;
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private Color[] vertexColors;
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void OnEnable()
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{
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InitializeMesh();
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}
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[ContextMenu("Refresh Mesh Data")]
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void InitializeMesh()
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{
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meshFilter = GetComponent<MeshFilter>();
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if (meshFilter == null || meshFilter.sharedMesh == null) return;
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// 注意：在编辑器模式下建议操作 sharedMesh
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mesh = meshFilter.sharedMesh;
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baseVertices = mesh.vertices;
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vertexColors = new Color[baseVertices.Length];
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// 初始化颜色
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UpdateHeatMap();
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}
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void Update()
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{
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if (baseVertices == null || heatSources == null || heatSources.Count == 0) return;
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UpdateHeatMap();
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}
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void UpdateHeatMap()
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{
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Matrix4x4 localToWorld = transform.localToWorldMatrix;
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for (int i = 0; i < baseVertices.Length; i++)
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{
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Vector3 vertexWorldPos = localToWorld.MultiplyPoint3x4(baseVertices[i]);
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float maxHeat = 0f;
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// --- 核心逻辑：遍历所有热源，取影响最大的那个 ---
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foreach (var source in heatSources)
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{
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if (source == null) continue;
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float distance = Vector3.Distance(vertexWorldPos, source.position);
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float t = Mathf.Clamp01(distance / heatRadius);
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float currentHeat = heatFalloff.Evaluate(t);
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// 取所有热源中对该点影响最大的热度
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if (currentHeat > maxHeat)
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{
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maxHeat = currentHeat;
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}
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}
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// 映射颜色
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vertexColors[i] = Color.Lerp(coldColor, hotColor, maxHeat);
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}
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mesh.colors = vertexColors;
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}
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void OnDrawGizmosSelected()
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{
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// 选中物体时画出所有热源范围
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Gizmos.color = new Color(1, 1, 0, 0.2f);
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foreach (var source in heatSources)
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{
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if (source != null) Gizmos.DrawWireSphere(source.position, heatRadius);
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}
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}
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} |