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feat(core): UCG Stage 1 — EnvCell.FromDat derivation (mirrors BuildLoadedCell)

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-06-02 09:07:18 +02:00
parent 76c9e2f07d
commit 5bc72d5cd1
4 changed files with 109 additions and 4 deletions
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55
src/AcDream.Core/World/Cells/EnvCell.cs
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@ -1,7 +1,9 @@
using System;
using System.Collections.Generic;
using System.Numerics;
using AcDream.Core.Physics; // BSPQuery
using DatReaderWriter.Types; // CellBSPTree
using DatReaderWriter.Enums; // EnvCellFlags
using DatReaderWriter.Types; // CellBSPTree, CellStruct
namespace AcDream.Core.World.Cells;
@ -30,4 +32,55 @@ public sealed class EnvCell : ObjCell
&& local.Y >= LocalBoundsMin.Y && local.Y <= LocalBoundsMax.Y
&& local.Z >= LocalBoundsMin.Z && local.Z <= LocalBoundsMax.Z;
}
/// <summary>
/// Build an EnvCell from dat data. Mirrors the render derivation in
/// BuildLoadedCell (GameWindow.cs:5588-5704) so Core and render stay equivalent.
/// <paramref name="worldTransform"/> MUST be the physics-verbatim transform
/// (no +2 cm render lift).
/// </summary>
public static EnvCell FromDat(uint id, DatReaderWriter.DBObjs.EnvCell datCell,
CellStruct cellStruct, Matrix4x4 worldTransform)
{
Matrix4x4.Invert(worldTransform, out var inverse);
var min = new Vector3(float.MaxValue);
var max = new Vector3(float.MinValue);
foreach (var kvp in cellStruct.VertexArray.Vertices)
{
var p = new Vector3(kvp.Value.Origin.X, kvp.Value.Origin.Y, kvp.Value.Origin.Z);
min = Vector3.Min(min, p);
max = Vector3.Max(max, p);
}
if (min.X == float.MaxValue) { min = Vector3.Zero; max = Vector3.Zero; }
var portals = new List<CellPortal>(datCell.CellPortals.Count);
foreach (var p in datCell.CellPortals)
{
portals.Add(new CellPortal(
otherCellId: p.OtherCellId,
otherPortalId: p.OtherPortalId,
polygonId: p.PolygonId,
flags: (ushort)p.Flags,
polygonLocal: ResolvePortalPolygon(cellStruct, p.PolygonId)));
}
uint lbPrefix = id & 0xFFFF0000u;
var stab = new List<uint>(datCell.VisibleCells.Count);
foreach (var low in datCell.VisibleCells) stab.Add(lbPrefix | low);
bool seenOutside = datCell.Flags.HasFlag(EnvCellFlags.SeenOutside);
return new EnvCell(id, worldTransform, inverse, min, max, portals, stab,
seenOutside, cellStruct.CellBSP);
}
private static IReadOnlyList<Vector3> ResolvePortalPolygon(CellStruct cellStruct, ushort polygonId)
{
if (!cellStruct.Polygons.TryGetValue(polygonId, out var poly)) return Array.Empty<Vector3>();
var verts = new List<Vector3>(poly.VertexIds.Count);
foreach (var vid in poly.VertexIds)
if (cellStruct.VertexArray.Vertices.TryGetValue((ushort)vid, out var v))
verts.Add(new Vector3(v.Origin.X, v.Origin.Y, v.Origin.Z));
return verts;
}
}