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feat(camera): add RetailChaseCamera math primitives

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Seven pure-math helpers in the new RetailChaseCamera class:
ComputeHeading (slope-align with flat fallback), BuildBasis (heading
→ orthonormal frame, near-vertical fallback), PushVelocity +
AverageVelocity (5-entry FIFO ring), ComputeDampingAlpha (retail's
stiffness*dt*10), FilterMouseAxis (0.25s low-pass), ComputeTranslucency
(linear ramp 0.20..0.45 m). 20 tests, all pass. State machine + Update()
land in the next commit.

Per spec docs/superpowers/specs/2026-05-18-retail-chase-camera-design.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-18 19:36:24 +02:00
parent 5945f1d915
commit 8ebd33dc8f
3 changed files with 439 additions and 0 deletions
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src/AcDream.App/AcDream.App.csproj
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@ -11,6 +11,7 @@
</PropertyGroup>
<ItemGroup>
<InternalsVisibleTo Include="AcDream.Core.Tests" />
<InternalsVisibleTo Include="AcDream.App.Tests" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Silk.NET.OpenGL" Version="2.23.0" />