3764867566
WorldPicker.Pick previously had no occlusion test — any entity along the click ray within maxDistance was a candidate, including ones behind walls. Adds the CellBspRayOccluder static helper that Möller-Trumbore-tests the click ray against every polygon in every currently-cached EnvCell BSP, returning the nearest wall-hit `t`. Both Pick overloads gate candidate selection by that wall-t (legacy ray-sphere via world-space `t`, screen-rect via camera-space clip.W depth — matching ScreenProjection.TryProjectSphereToScreenRect's convention). PhysicsDataCache exposes a new CellStructIds snapshot accessor so the caller can iterate without needing the private cache dictionary. CellPhysics.BSP/PhysicsPolygons/Vertices relaxed from required to nullable so test fixtures can construct a CellPhysics from Resolved alone without a real DAT BSP object. GameWindow snapshots the loaded cell physics on each Pick call and passes the occluder callback. Closes #86. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
81 lines
2.4 KiB
C#
81 lines
2.4 KiB
C#
using System.Numerics;
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using AcDream.Core.Physics;
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using AcDream.Core.Selection;
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using AcDream.Core.World;
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using DatReaderWriter.Enums;
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using Xunit;
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namespace AcDream.Core.Tests.Selection;
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public class WorldPickerCellOcclusionTests
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{
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private static CellPhysics MakeWallAtY10()
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{
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// A quad wall at Y=10 spanning X=-5..5, Z=-5..5 (local space = world space
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// because WorldTransform = Identity). The occluder triangulates it as a fan:
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// tri0 = [0,1,2], tri1 = [0,2,3]. A ray travelling +Y from Y=0 hits it at t≈10.
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var verts = new[]
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{
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new Vector3(-5, 10, -5),
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new Vector3( 5, 10, -5),
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new Vector3( 5, 10, 5),
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new Vector3(-5, 10, 5),
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};
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var poly = new ResolvedPolygon
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{
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Vertices = verts,
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Plane = new System.Numerics.Plane(new Vector3(0, -1, 0), 10f),
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NumPoints = 4,
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SidesType = CullMode.None,
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};
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return new CellPhysics
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{
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BSP = null,
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Resolved = new() { [0] = poly },
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WorldTransform = Matrix4x4.Identity,
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InverseWorldTransform = Matrix4x4.Identity,
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};
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}
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private static WorldEntity MakeEntity(uint guid, Vector3 pos) => new()
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{
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Id = guid,
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ServerGuid = guid,
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SourceGfxObjOrSetupId = 0,
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Position = pos,
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Rotation = Quaternion.Identity,
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MeshRefs = System.Array.Empty<MeshRef>(),
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};
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[Fact]
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public void Pick_RaySphere_EntityBehindWall_OccludedByCellBsp()
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{
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var wall = MakeWallAtY10();
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var entity = MakeEntity(0xABCDu, new Vector3(0, 20, 0)); // entity at Y=20, wall at Y=10
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var result = WorldPicker.Pick(
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origin: Vector3.Zero,
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direction: Vector3.UnitY,
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candidates: new[] { entity },
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skipServerGuid: 0u,
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cellOccluder: (origin, direction) =>
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CellBspRayOccluder.NearestWallT(origin, direction, new[] { wall }));
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Assert.Null(result);
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}
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[Fact]
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public void Pick_RaySphere_NoWall_HitsEntity()
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{
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var entity = MakeEntity(0xABCDu, new Vector3(0, 20, 0));
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var result = WorldPicker.Pick(
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origin: Vector3.Zero,
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direction: Vector3.UnitY,
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candidates: new[] { entity },
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skipServerGuid: 0u,
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cellOccluder: null); // null occluder = no occlusion
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Assert.Equal(0xABCDu, result);
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}
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}
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