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>
86 lines
3 KiB
C#
86 lines
3 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 DatReaderWriter.Enums;
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using Xunit;
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namespace AcDream.Core.Tests.Selection;
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public class CellBspRayOccluderTests
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{
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// Build a CellPhysics with a single triangular poly at world-Y=10.
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// Triangle vertices in local space, world transform = identity.
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// Uses the Resolved-only constructor path (BSP = null is allowed after Phase 1 relaxation).
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private static CellPhysics MakeWallCell()
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{
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var verts = new[]
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{
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new Vector3(-5, 10, 0),
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new Vector3( 5, 10, 0),
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new Vector3( 0, 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 = 3,
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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, // Occluder doesn't use BSP — direct poly iteration.
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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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[Fact]
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public void NearestWallT_RayHitsTriangle_ReturnsHitDistance()
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{
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var cell = MakeWallCell();
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var origin = new Vector3(0, 0, 1);
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var direction = Vector3.UnitY; // travels +Y toward the wall at Y=10
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float t = CellBspRayOccluder.NearestWallT(origin, direction, new[] { cell });
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Assert.True(t > 9.9f && t < 10.1f, $"expected ~10, got {t}");
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}
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[Fact]
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public void NearestWallT_RayMisses_ReturnsPositiveInfinity()
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{
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var cell = MakeWallCell();
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var origin = new Vector3(0, 0, 1);
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var direction = -Vector3.UnitY; // travels AWAY from the wall
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float t = CellBspRayOccluder.NearestWallT(origin, direction, new[] { cell });
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Assert.True(float.IsPositiveInfinity(t), $"expected +inf, got {t}");
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}
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[Fact]
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public void NearestWallT_EmptyCellList_ReturnsPositiveInfinity()
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{
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var origin = Vector3.Zero;
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var direction = Vector3.UnitY;
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float t = CellBspRayOccluder.NearestWallT(origin, direction, System.Array.Empty<CellPhysics>());
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Assert.True(float.IsPositiveInfinity(t));
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}
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[Fact]
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public void NearestWallT_TwoCells_ReturnsNearer()
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{
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var nearCell = MakeWallCell(); // wall at Y=10
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var farCell = MakeWallCell();
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// Move farCell's transform to push it to Y=20.
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farCell = new CellPhysics
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{
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BSP = null,
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Resolved = nearCell.Resolved,
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WorldTransform = Matrix4x4.CreateTranslation(0, 10, 0),
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InverseWorldTransform = Matrix4x4.CreateTranslation(0, -10, 0),
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};
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var origin = new Vector3(0, 0, 1);
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var direction = Vector3.UnitY;
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float t = CellBspRayOccluder.NearestWallT(origin, direction, new[] { farCell, nearCell });
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Assert.True(t < 11f, $"expected near-cell hit ~10, got {t}");
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}
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}
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