222 lines
8.5 KiB
C#
222 lines
8.5 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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/// <summary>
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/// 单 Mesh 线缆渲染(移植自 Assets/Prototype/2D线缆物理交互 原型的 drawCablePath):
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/// 把平滑后的折线扩成多层 ribbon(阴影/描边/主体/中间调/高光),顶点色分带,
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/// 中间调与高光垂直上移形成顶光效果,阴影下移形成落影。
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/// 带序由三角形提交顺序决定(后画的盖前画的),对外只有一个 sortingOrder,
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/// 自遮挡时把尾段几何追加在最后,等效原型的 tail-over-head 重绘。
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/// </summary>
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[RequireComponent(typeof(MeshFilter), typeof(MeshRenderer))]
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public class CableMeshRenderer : MonoBehaviour
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{
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[System.Serializable]
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public struct Band
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{
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public Color color;
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public float width; // 世界单位
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public float lift; // 垂直偏移,+向上 / -向下(对应原型的屏幕空间 translate)
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public bool skipInTail; // 尾段重绘时跳过(原型尾段不重画阴影)
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public Band(Color color, float width, float lift, bool skipInTail = false)
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{
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this.color = color;
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this.width = width;
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this.lift = lift;
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this.skipInTail = skipInTail;
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}
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}
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private MeshFilter _filter;
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private MeshRenderer _renderer;
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private Mesh _mesh;
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private Band[] _bands = System.Array.Empty<Band>();
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private const int CapSegments = 10; // 圆头端帽半圆细分
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private float _tipTaperFraction; // 末端收窄段占全长比例(0 关闭)
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private float _tipTaperScale = 1f;
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private Color _environmentTint = Color.white;
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private readonly List<Vector3> _vertices = new(1024);
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private readonly List<Color32> _colors = new(1024);
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private readonly List<int> _triangles = new(4096);
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private void Awake()
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{
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_filter = GetComponent<MeshFilter>();
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_renderer = GetComponent<MeshRenderer>();
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_mesh = new Mesh { name = "Cable Mesh" };
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_mesh.MarkDynamic();
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_filter.sharedMesh = _mesh;
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_renderer.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
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_renderer.receiveShadows = false;
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_renderer.lightProbeUsage = UnityEngine.Rendering.LightProbeUsage.Off;
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_renderer.reflectionProbeUsage = UnityEngine.Rendering.ReflectionProbeUsage.Off;
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}
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public void Configure(Material material, string sortingLayerName, int sortingOrder)
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{
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if (_renderer == null) _renderer = GetComponent<MeshRenderer>();
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_renderer.sharedMaterial = material;
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_renderer.sortingLayerName = sortingLayerName;
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_renderer.sortingOrder = sortingOrder;
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}
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public void SetBands(Band[] bands)
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{
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_bands = bands ?? System.Array.Empty<Band>();
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}
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/// <summary>
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/// 设置动态网格的环境光色调。RGB 会调制各色带，Alpha 保持原值。
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/// </summary>
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public void SetEnvironmentTint(Color tint)
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{
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_environmentTint = tint;
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}
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/// <summary>末端宽度收窄:最后 fraction 段从全宽线性收到 scale 倍(线头略细于孔圈)。</summary>
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public void SetTipTaper(float fraction, float scale)
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{
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_tipTaperFraction = Mathf.Clamp01(fraction);
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_tipTaperScale = Mathf.Clamp(scale, 0.1f, 1f);
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}
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public void SetVisible(bool visible)
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{
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if (_renderer == null) _renderer = GetComponent<MeshRenderer>();
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_renderer.enabled = visible;
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}
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/// <summary>
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/// 用世界坐标折线重建网格。顶点直接使用世界坐标,本物体的世界变换须保持 identity
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/// (由创建方负责摆到世界原点)。tailStart >= 0 时,从该下标起把非阴影带重绘一遍盖在最上。
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/// roundEndCap 时线缆末端用圆头端帽(半圆,同旧 LineRenderer 圆头),平头改圆头。
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/// </summary>
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public void UpdateMesh(Vector3[] points, int count, int tailStart, bool roundEndCap = false)
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{
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if (_mesh == null || points == null || count < 2) return;
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// 顶点是世界坐标,本物体世界变换必须保持 identity(父级面板移动时会被带偏,持续归零)
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if (transform.position != Vector3.zero) transform.position = Vector3.zero;
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if (transform.rotation != Quaternion.identity) transform.rotation = Quaternion.identity;
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_vertices.Clear();
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_colors.Clear();
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_triangles.Clear();
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for (int b = 0; b < _bands.Length; b++)
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{
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AppendBand(points, 0, count, in _bands[b], roundEndCap);
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}
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if (tailStart >= 0 && tailStart < count - 1)
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{
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for (int b = 0; b < _bands.Length; b++)
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{
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if (_bands[b].skipInTail) continue;
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AppendBand(points, tailStart, count, in _bands[b], roundEndCap);
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}
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}
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_mesh.Clear();
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_mesh.SetVertices(_vertices);
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_mesh.SetColors(_colors);
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_mesh.SetTriangles(_triangles, 0);
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_mesh.RecalculateBounds();
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}
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private void AppendBand(Vector3[] points, int start, int count, in Band band, bool roundEndCap = false)
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{
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int baseIndex = _vertices.Count;
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float half = band.width * 0.5f;
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Color32 color = new Color(
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band.color.r * _environmentTint.r,
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band.color.g * _environmentTint.g,
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band.color.b * _environmentTint.b,
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band.color.a);
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for (int i = start; i < count; i++)
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{
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Vector3 prev = points[Mathf.Max(start, i - 1)];
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Vector3 next = points[Mathf.Min(count - 1, i + 1)];
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Vector3 dir = next - prev;
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dir.z = 0f;
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float mag = dir.magnitude;
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Vector3 n = mag > 1e-6f
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? new Vector3(-dir.y / mag, dir.x / mag, 0f)
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: Vector3.right;
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// 偏移量取"世界上方向在截面上的投影":水平段全额偏移(同原型的屏幕空间平移),
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// 竖直段自然衰减为 0——偏移始终垂直于线身,不会在出线口/末端沿线方向戳出残留
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Vector3 liftDir = Vector3.up - (mag > 1e-6f ? dir / mag * (dir.y / mag) : Vector3.zero);
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Vector3 p = points[i] + liftDir * band.lift;
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float taperedHalf = half * TipTaper(i, count);
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_vertices.Add(p + n * taperedHalf);
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_vertices.Add(p - n * taperedHalf);
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_colors.Add(color);
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_colors.Add(color);
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}
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int rows = count - start;
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for (int r = 0; r < rows - 1; r++)
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{
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int i0 = baseIndex + r * 2;
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_triangles.Add(i0);
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_triangles.Add(i0 + 2);
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_triangles.Add(i0 + 1);
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_triangles.Add(i0 + 1);
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_triangles.Add(i0 + 2);
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_triangles.Add(i0 + 3);
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}
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if (roundEndCap && count - start >= 2)
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{
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AppendRoundCap(points, count, in band, color, half * _tipTaperScale);
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}
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}
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/// <summary>末端宽度收窄系数:最后 _tipTaperFraction 段从 1 线性降到 _tipTaperScale。</summary>
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private float TipTaper(int index, int count)
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{
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if (_tipTaperFraction <= 0f || count < 2) return 1f;
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float f = index / (float)(count - 1);
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float taperStart = 1f - _tipTaperFraction;
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if (f <= taperStart) return 1f;
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return Mathf.Lerp(1f, _tipTaperScale, (f - taperStart) / _tipTaperFraction);
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}
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/// <summary>末端半圆端帽:沿末段方向向前鼓出,半径即带宽一半——线缆自身的圆头,非附加物。</summary>
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private void AppendRoundCap(Vector3[] points, int count, in Band band, Color32 color, float half)
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{
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Vector3 dir = points[count - 1] - points[count - 2];
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dir.z = 0f;
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float mag = dir.magnitude;
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if (mag < 1e-6f) return;
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dir /= mag;
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Vector3 n = new(-dir.y, dir.x, 0f);
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Vector3 liftDir = Vector3.up - dir * dir.y;
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Vector3 center = points[count - 1] + liftDir * band.lift;
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int baseIndex = _vertices.Count;
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_vertices.Add(center);
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_colors.Add(color);
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for (int i = 0; i <= CapSegments; i++)
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{
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// φ 从 -π/2(−n 侧)扫到 +π/2(+n 侧),中点朝向 dir:正好补上平头切面
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float phi = -Mathf.PI * 0.5f + i * (Mathf.PI / CapSegments);
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_vertices.Add(center + (n * Mathf.Sin(phi) + dir * Mathf.Cos(phi)) * half);
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_colors.Add(color);
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}
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for (int i = 0; i < CapSegments; i++)
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{
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_triangles.Add(baseIndex);
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_triangles.Add(baseIndex + 1 + i + 1);
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_triangles.Add(baseIndex + 1 + i);
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}
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}
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}
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