98 lines
3.4 KiB
C#
98 lines
3.4 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using TransportGame.Model;
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using UnityEngine;
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namespace TransportGame.Unity
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{
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public class BuildingMeshGenerator
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{
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public Material BuildingMaterial { get; set; }
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private GameObject parent = new GameObject("buildings");
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private Map map;
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public IEnumerable Generate(Map map)
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{
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this.map = map;
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foreach (var building in map.Buildings)
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{
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GenerateBuilding(building);
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yield return null;
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}
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}
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private void GenerateBuilding(Building building)
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{
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List<Vector3> vertices = new List<Vector3>();
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List<UnityEngine.Vector2> uv = new List<UnityEngine.Vector2>();
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List<int> triangles = new List<int>();
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int vIndex = 0;
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if (building.Polygons.Length == 0)
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return;
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float terrainHeight = building.Polygons[0].SelectMany(poly => poly.Points).Min(pt => map.GetHeight((int)pt.X, (int)pt.Y));
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float minY, maxY = terrainHeight;
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for (int i = 0; i < building.Polygons.Length; i++)
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{
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// Update minY and maxY
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minY = maxY;
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maxY += building.LevelHeights[i];
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for (int p = 0; p < building.Polygons[i].Length; p++)
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{
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// Build mesh
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var center = building.Polygons[i][p].Position;
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var pts = building.Polygons[i][p].Points;
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for (int j = 0; j < pts.Length; j++)
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{
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int k = (j + 1) % pts.Length;
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vertices.Add(new Vector3(pts[j].Y, minY, pts[j].X));
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vertices.Add(new Vector3(pts[k].Y, minY, pts[k].X));
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vertices.Add(new Vector3(pts[k].Y, maxY, pts[k].X));
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vertices.Add(new Vector3(pts[j].Y, maxY, pts[j].X));
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vertices.Add(new Vector3(center.Y, maxY, center.X));
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uv.Add(new UnityEngine.Vector2(0, 0));
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uv.Add(new UnityEngine.Vector2(0, 1));
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uv.Add(new UnityEngine.Vector2(1, 1));
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uv.Add(new UnityEngine.Vector2(1, 0));
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uv.Add(new UnityEngine.Vector2(0.5f, 0.5f));
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triangles.AddRange(new[] { vIndex, vIndex + 1, vIndex + 2 });
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triangles.AddRange(new[] { vIndex, vIndex + 2, vIndex + 3 });
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triangles.AddRange(new[] { vIndex + 4, vIndex + 3, vIndex + 2 }); // top side
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vIndex = vertices.Count;
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}
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}
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}
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// Construct mesh
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Mesh mesh = new Mesh();
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mesh.vertices = vertices.ToArray();
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mesh.triangles = triangles.ToArray();
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mesh.uv = uv.ToArray();
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mesh.RecalculateNormals();
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// Construct game object
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GameObject inters = new GameObject("building");
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inters.transform.parent = parent.transform;
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MeshFilter meshFilter = inters.AddComponent<MeshFilter>();
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meshFilter.mesh = mesh;
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MeshRenderer meshRenderer = inters.AddComponent<MeshRenderer>();
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meshRenderer.materials = new[] { BuildingMaterial };
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}
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}
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}
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