442 lines
16 KiB
C#
442 lines
16 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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namespace IndianOceanAssets.Engine2_5D
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{
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/// <summary>
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/// 地面边界生成器 v2 —— 从 Sprite Physics Shape 或 PolygonCollider2D 自动提取边界，
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/// 生成崖壁 Mesh + 边缘发光条带。
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///
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/// 替代 CliffWallBuilder 的手动摆点方式。
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/// 美术改图后只需重新 Build，无需手动调整边界点。
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///
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/// 使用方式：
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/// 1. 场景中创建空物体，挂上此脚本（放在地面高度 Y=0）
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/// 2. 把地面 SpriteRenderer 拖到 groundSprite 字段
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/// （或把 PolygonCollider2D 拖到 polygonCollider 字段）
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/// 3. 指定 wallMaterial（URP Unlit 暗色）
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/// 4. Inspector 点 "Build Ground" 按钮
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/// </summary>
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public class GroundBuilder : MonoBehaviour
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{
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[Header("数据源")]
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[Tooltip("地面精灵渲染器。从此 Sprite 的 Physics Shape 自动提取边界轮廓。\n" +
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"需要在 Sprite Editor 里 Generate Physics Shape（默认自动生成）。")]
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[SerializeField] SpriteRenderer groundSprite;
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[Tooltip("可选：直接用 PolygonCollider2D 的路径作为边界。\n" +
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"留空则用 Sprite Physics Shape。")]
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[SerializeField] PolygonCollider2D polygonCollider;
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[Header("崖壁")]
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[Tooltip("崖壁往下延伸的高度（世界单位）")]
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[SerializeField] float wallHeight = 5f;
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[Tooltip("崖壁材质（建议 URP Unlit，深色，Cull Off 双面）")]
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[SerializeField] Material wallMaterial;
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[Header("边缘发光")]
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[Tooltip("是否生成顶部发光条带")]
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[SerializeField] bool generateEdgeGlow = true;
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[Tooltip("发光条带的高度（世界单位）")]
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[SerializeField] float edgeGlowHeight = 0.3f;
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[Tooltip("发光颜色")]
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[SerializeField] Color edgeGlowColor = new Color(0.2f, 0.6f, 0.9f, 1f);
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[Tooltip("发光亮度")]
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[SerializeField, Range(0.1f, 5f)] float edgeGlowIntensity = 1.5f;
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[Tooltip("渐变：越大上边越亮下边越暗")]
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[SerializeField, Range(0.1f, 3f)] float edgeGlowGradient = 1f;
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[Tooltip("边缘发光材质（使用 AbyssEdgeGlow shader）。留空则自动创建。")]
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[SerializeField] Material edgeGlowMaterial;
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[Header("优化")]
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[Tooltip("Douglas-Peucker 简化容差（世界单位）。0 = 不简化。\n" +
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"建议 0.05~0.2，减少顶点数同时保持轮廓形状。")]
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[SerializeField] float simplifyTolerance = 0.1f;
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[Tooltip("UV 平铺缩放（越大纹理越密）")]
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[SerializeField] float uvScale = 1f;
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private const string GENERATED = "Generated_Ground";
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/// <summary>Editor 脚本读取用。</summary>
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public float SimplifyTolerance => simplifyTolerance;
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/// <summary>
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/// 从数据源提取边界点（世界坐标）。
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/// </summary>
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public List<List<Vector3>> GetBoundaryPaths()
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{
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var paths = new List<List<Vector3>>();
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if (polygonCollider != null)
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{
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// 从 PolygonCollider2D 读取所有路径
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for (int i = 0; i < polygonCollider.pathCount; i++)
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{
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Vector2[] path = polygonCollider.GetPath(i);
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var worldPath = new List<Vector3>();
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foreach (var p in path)
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{
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Vector3 world = polygonCollider.transform.TransformPoint(p.x, p.y, 0f);
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worldPath.Add(world);
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}
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if (worldPath.Count >= 3)
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paths.Add(worldPath);
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}
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}
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else if (groundSprite != null && groundSprite.sprite != null)
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{
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// 从 Sprite Physics Shape 读取所有轮廓
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Sprite sprite = groundSprite.sprite;
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int shapeCount = sprite.GetPhysicsShapeCount();
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for (int i = 0; i < shapeCount; i++)
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{
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var shape = new List<Vector2>();
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sprite.GetPhysicsShape(i, shape);
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var worldPath = new List<Vector3>();
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foreach (var p in shape)
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{
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// Sprite 局部坐标 → 世界坐标
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// TransformPoint 自动处理旋转（地面精灵平铺时 X→X, Y→Z）
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Vector3 world = groundSprite.transform.TransformPoint(p.x, p.y, 0f);
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worldPath.Add(world);
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}
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if (worldPath.Count >= 3)
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paths.Add(worldPath);
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}
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}
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return paths;
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}
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/// <summary>
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/// 生成崖壁 + 发光条带。
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/// </summary>
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[ContextMenu("Build Ground")]
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public void Build()
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{
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var paths = GetBoundaryPaths();
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if (paths.Count == 0)
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{
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Debug.LogWarning("[GroundBuilder] 没有找到边界数据。\n" +
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"请指定 groundSprite（Sprite 需有 Physics Shape）或 polygonCollider。");
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return;
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}
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// 简化
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if (simplifyTolerance > 0f)
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{
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for (int i = 0; i < paths.Count; i++)
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paths[i] = SimplifyClosedPath(paths[i], simplifyTolerance);
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}
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// 清除旧生成物
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ClearGenerated();
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// 创建容器
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GameObject container = new GameObject(GENERATED);
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container.transform.SetParent(transform, false);
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int totalPoints = 0;
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// 为每条路径生成崖壁和发光
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for (int i = 0; i < paths.Count; i++)
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{
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var path = paths[i];
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totalPoints += path.Count;
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// ---- 崖壁 Mesh ----
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GameObject wallObj = new GameObject($"CliffWall_{i}");
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wallObj.transform.SetParent(container.transform, false);
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MeshFilter wallMF = wallObj.AddComponent<MeshFilter>();
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MeshRenderer wallMR = wallObj.AddComponent<MeshRenderer>();
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wallMF.sharedMesh = GenerateWallMesh(path);
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wallMR.sharedMaterial = wallMaterial;
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// ---- 边缘发光 Mesh ----
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if (generateEdgeGlow)
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{
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GameObject glowObj = new GameObject($"EdgeGlow_{i}");
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glowObj.transform.SetParent(container.transform, false);
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MeshFilter glowMF = glowObj.AddComponent<MeshFilter>();
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MeshRenderer glowMR = glowObj.AddComponent<MeshRenderer>();
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glowMF.sharedMesh = GenerateEdgeGlowMesh(path);
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if (edgeGlowMaterial != null)
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{
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glowMR.sharedMaterial = edgeGlowMaterial;
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}
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else
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{
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Shader glowShader = Shader.Find("IndianOcean/AbyssEdgeGlow");
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if (glowShader != null)
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{
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Material mat = new Material(glowShader);
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mat.SetColor("_Color", edgeGlowColor);
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mat.SetFloat("_Intensity", edgeGlowIntensity);
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mat.SetFloat("_Gradient", edgeGlowGradient);
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glowMR.sharedMaterial = mat;
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}
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else
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{
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Debug.LogWarning("[GroundBuilder] 找不到 IndianOcean/AbyssEdgeGlow shader。");
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}
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}
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}
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}
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int totalEdges = 0;
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foreach (var p in paths) totalEdges += p.Count;
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Debug.Log($"[GroundBuilder] 生成完成：{paths.Count} 条路径，{totalEdges} 个边界点，" +
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$"崖壁高度 {wallHeight}。" +
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(simplifyTolerance > 0 ? $" 已简化（容差 {simplifyTolerance}）。" : ""));
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}
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/// <summary>
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/// 清除所有生成物。
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/// </summary>
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[ContextMenu("Clear Generated")]
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public void ClearGenerated()
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{
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Transform old = transform.Find(GENERATED);
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if (old != null)
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{
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if (Application.isPlaying)
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Destroy(old.gameObject);
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else
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DestroyImmediate(old.gameObject);
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}
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}
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// ============================================================
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// Mesh 生成（共享顶点 + 距离 UV + 手动法线）
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// ============================================================
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/// <summary>
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/// 生成崖壁 Mesh：闭合路径，每条边一个垂直四边形（双面），共享顶点。
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/// UV.x 按边长累积（纹理不拉伸），UV.y: 1=顶 0=底。
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/// </summary>
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Mesh GenerateWallMesh(List<Vector3> worldPoints)
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{
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int n = worldPoints.Count;
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// 世界坐标 → 本地坐标
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var local = new Vector3[n];
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for (int i = 0; i < n; i++)
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local[i] = transform.InverseTransformPoint(worldPoints[i]);
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// 顶点：top ring (0..n-1) + bottom ring (n..2n-1)
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Vector3[] verts = new Vector3[n * 2];
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Vector2[] uvs = new Vector2[n * 2];
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Vector3[] norms = new Vector3[n * 2];
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float u = 0f;
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for (int i = 0; i < n; i++)
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{
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int next = (i + 1) % n;
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Vector3 top = local[i];
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Vector3 bot = local[i] + new Vector3(0, -wallHeight, 0);
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verts[i] = top;
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verts[n + i] = bot;
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// UV.x 按距离累积
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float edgeLen = Vector3.Distance(local[i], local[next]);
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uvs[i] = new Vector2(u * uvScale, 1f);
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uvs[n + i] = new Vector2(u * uvScale, 0f);
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u += edgeLen;
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// 法线：边的垂直方向，朝外
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Vector3 edge = local[next] - local[i];
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Vector3 normal = Vector3.Cross(edge, Vector3.down).normalized;
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norms[i] = normal;
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norms[n + i] = normal;
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}
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// 三角形：双面
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var tris = new List<int>(n * 4);
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for (int i = 0; i < n; i++)
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{
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int next = (i + 1) % n;
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int ti = i, tj = next, bi = n + i, bj = n + next;
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// 正面
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tris.Add(ti); tris.Add(tj); tris.Add(bj);
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tris.Add(ti); tris.Add(bj); tris.Add(bi);
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// 背面（反绕）
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tris.Add(ti); tris.Add(bj); tris.Add(tj);
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tris.Add(ti); tris.Add(bi); tris.Add(bj);
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}
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Mesh mesh = new Mesh { name = "GroundWall" };
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mesh.SetVertices(verts);
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mesh.SetUVs(0, uvs);
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mesh.SetNormals(norms);
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mesh.SetTriangles(tris, 0);
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mesh.RecalculateBounds();
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return mesh;
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}
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/// <summary>
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/// 生成边缘发光 Mesh：沿边界顶部的细条。
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/// UV.y: 1=顶部(亮) 0=底部(暗)，配合 AbyssEdgeGlow shader。
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/// </summary>
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Mesh GenerateEdgeGlowMesh(List<Vector3> worldPoints)
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{
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int n = worldPoints.Count;
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var local = new Vector3[n];
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for (int i = 0; i < n; i++)
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local[i] = transform.InverseTransformPoint(worldPoints[i]);
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Vector3[] verts = new Vector3[n * 2];
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Vector2[] uvs = new Vector2[n * 2];
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float u = 0f;
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for (int i = 0; i < n; i++)
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{
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int next = (i + 1) % n;
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verts[i] = local[i]; // 顶
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verts[n + i] = local[i] + new Vector3(0, -edgeGlowHeight, 0); // 底
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float edgeLen = Vector3.Distance(local[i], local[next]);
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uvs[i] = new Vector2(u * uvScale, 1f);
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uvs[n + i] = new Vector2(u * uvScale, 0f);
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u += edgeLen;
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}
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var tris = new List<int>(n * 4);
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for (int i = 0; i < n; i++)
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{
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int next = (i + 1) % n;
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int ti = i, tj = next, bi = n + i, bj = n + next;
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tris.Add(ti); tris.Add(tj); tris.Add(bj);
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tris.Add(ti); tris.Add(bj); tris.Add(bi);
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tris.Add(ti); tris.Add(bj); tris.Add(tj);
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tris.Add(ti); tris.Add(bi); tris.Add(bj);
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}
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Mesh mesh = new Mesh { name = "EdgeGlow" };
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mesh.SetVertices(verts);
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mesh.SetUVs(0, uvs);
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mesh.SetTriangles(tris, 0);
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mesh.RecalculateBounds();
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return mesh;
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}
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// ============================================================
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// Douglas-Peucker 路径简化
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// ============================================================
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/// <summary>
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/// 对闭合路径做 Douglas-Peucker 简化。
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/// 先找到离起点最远的点，把闭合路径拆成两条开放路径分别简化。
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/// </summary>
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List<Vector3> SimplifyClosedPath(List<Vector3> points, float tolerance)
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{
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if (points.Count < 4) return points;
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// 找离 points[0] 最远的点
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float maxDist = 0f;
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int farIdx = 1;
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for (int i = 1; i < points.Count; i++)
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{
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float d = Vector3.Distance(points[0], points[i]);
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if (d > maxDist) { maxDist = d; farIdx = i; }
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}
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// 拆成两段开放路径
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var arc1 = new List<Vector3>();
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var arc2 = new List<Vector3>();
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for (int i = 0; i <= farIdx; i++) arc1.Add(points[i]);
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for (int i = farIdx; i < points.Count; i++) arc2.Add(points[i]);
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arc2.Add(points[0]); // 闭合
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arc1 = DouglasPeucker(arc1, tolerance);
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arc2 = DouglasPeucker(arc2, tolerance);
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// 合并：arc1 + arc2[1..count-2]（跳过 arc2 首尾，它们和 arc1 重复）
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var result = new List<Vector3>(arc1);
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for (int i = 1; i < arc2.Count - 1; i++)
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result.Add(arc2[i]);
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return result;
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}
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List<Vector3> DouglasPeucker(List<Vector3> points, float tolerance)
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{
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if (points.Count < 3) return points;
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// 找离首末连线最远的点
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float maxDist = 0f;
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int maxIdx = 0;
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Vector3 a = points[0];
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Vector3 b = points[points.Count - 1];
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for (int i = 1; i < points.Count - 1; i++)
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{
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float d = PerpDistance(points[i], a, b);
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if (d > maxDist) { maxDist = d; maxIdx = i; }
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}
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if (maxDist > tolerance)
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{
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var left = DouglasPeucker(points.GetRange(0, maxIdx + 1), tolerance);
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var right = DouglasPeucker(points.GetRange(maxIdx, points.Count - maxIdx), tolerance);
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var result = new List<Vector3>(left);
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result.AddRange(right.GetRange(1, right.Count - 1));
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return result;
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}
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else
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{
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return new List<Vector3> { a, b };
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}
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}
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float PerpDistance(Vector3 p, Vector3 lineA, Vector3 lineB)
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{
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Vector3 ab = lineB - lineA;
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float lenSq = ab.sqrMagnitude;
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if (lenSq < 1e-8f) return Vector3.Distance(p, lineA);
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Vector3 ap = p - lineA;
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float t = Vector3.Dot(ap, ab) / lenSq;
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t = Mathf.Clamp01(t);
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Vector3 proj = lineA + t * ab;
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return Vector3.Distance(p, proj);
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}
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// ============================================================
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// Gizmos
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// ============================================================
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private void OnDrawGizmosSelected()
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{
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var paths = GetBoundaryPaths();
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if (paths.Count == 0) return;
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Gizmos.color = new Color(0.2f, 0.6f, 0.9f, 0.8f);
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foreach (var path in paths)
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{
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for (int i = 0; i < path.Count; i++)
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{
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Vector3 cur = path[i];
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Vector3 next = path[(i + 1) % path.Count];
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Gizmos.DrawLine(cur, next);
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Gizmos.DrawSphere(cur, 0.15f);
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}
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}
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}
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}
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}
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