f0b3bd9aa2
New AcDream.Core.Selection.WorldPicker static helper. BuildRay unprojects pixel (mouseX, mouseY) through a view+projection matrix pair into a world-space (origin, direction) ray. Used by GameWindow.OnInputAction to drive entity picking on click. Pure math, no state, no DI. Composes view*projection (System.Numerics row-vector convention, matching the rest of acdream's camera path — see GameWindow.cs:6445 FrustumPlanes.FromViewProjection). 2 xUnit tests cover center-of-viewport (forward ray) and right-of-center (positive-X deflection). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
54 lines
1.7 KiB
C#
54 lines
1.7 KiB
C#
using System;
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using System.Numerics;
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using AcDream.Core.Selection;
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using Xunit;
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namespace AcDream.Core.Tests.Selection;
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public class WorldPickerTests
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{
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private const float Epsilon = 0.01f;
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private static (Matrix4x4 View, Matrix4x4 Projection) MakeIdentityCamera()
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{
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var view = Matrix4x4.Identity;
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var proj = Matrix4x4.CreatePerspectiveFieldOfView(
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fieldOfView: MathF.PI / 3f,
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aspectRatio: 16f / 9f,
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nearPlaneDistance: 0.1f,
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farPlaneDistance: 100f);
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return (view, proj);
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}
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[Fact]
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public void BuildRay_CenterOfViewport_ReturnsForwardRay()
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{
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var (view, proj) = MakeIdentityCamera();
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const float vpW = 1920f, vpH = 1080f;
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var (_, direction) = WorldPicker.BuildRay(
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mouseX: vpW / 2f, mouseY: vpH / 2f,
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viewportW: vpW, viewportH: vpH,
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view, proj);
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// Right-handed perspective + identity view -> camera looks down -Z.
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// Center pixel ray = (0, 0, -1) within float epsilon.
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Assert.True(MathF.Abs(direction.X) < Epsilon, $"direction.X = {direction.X}");
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Assert.True(MathF.Abs(direction.Y) < Epsilon, $"direction.Y = {direction.Y}");
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Assert.True(direction.Z < -0.99f, $"direction.Z = {direction.Z}");
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}
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[Fact]
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public void BuildRay_OffsetMouseRight_DeflectsRayPositiveX()
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{
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var (view, proj) = MakeIdentityCamera();
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const float vpW = 1920f, vpH = 1080f;
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var (_, direction) = WorldPicker.BuildRay(
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mouseX: vpW * 0.75f, mouseY: vpH / 2f,
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viewportW: vpW, viewportH: vpH,
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view, proj);
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Assert.True(direction.X > 0.1f, $"direction.X = {direction.X} (expected > 0.1)");
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}
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}
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