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acdream/memory/project_session_2026_04_14.md
Erik b16a149718 docs: session handoff + collision port mandate in memory 
Session 2026-04-14 summary: rendering rebuild complete, movement
speed+jump+facing working, collision partially working but needs
full retail port.

Memory updated with explicit user feedback: no more patching
collision, must port from decompiled code faithfully per CLAUDE.md.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-14 15:48:21 +02:00

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Session Handoff — 2026-04-14

What shipped this session

Rendering rebuild (5 steps, all complete)

  • Step 1: Instanced mesh rendering (DrawElementsInstanced, 800+ FPS)
  • Step 2: Terrain chunk batching (16×16 ACME-style chunks)
  • Step 3: AdjustPlanes lighting (ACME constants)
  • Step 4: EnvCell portal visibility (BFS, conditional depth clear)
  • Step 5: Animation already in instanced pipeline

Movement (Layer 1 — working)

  • Run speed from PlayerWeenie RunRate formula (Run skill 200 → 9.5 m/s)
  • Charged jump with proper physics arc + server packet (0xF61B)
  • Facing direction quaternion convention (AC heading via holtburger)
  • Jump apex velocity zeroing bug fixed (SmallVelocity threshold)
  • Airborne momentum preservation (no velocity replacement while jumping)

Collision (partially working — needs full rewrite)

  • ShadowObjectRegistry cell-based spatial index
  • PhysicsDataCache stores GfxObj BSP + Setup CylSphere + CellStruct BSP
  • BSPQuery with 6-path dispatcher (attempted but incomplete)
  • CylSphere collision for trees/rocks
  • SlideSphere crease-projection for wall sliding
  • Multiple bug fixes (broad-phase, push-out, corner stuck, safety margins)

Infrastructure

  • docs/bugs.md for tracking known issues
  • Movement completion design spec + implementation plan

What did NOT work

The collision system was built by patching symptoms instead of porting the retail code faithfully. After ~10 iterations of fixes, it handles ~60-70% of cases but still clips through some buildings, trees, and objects. The user explicitly requested a full retail port — no shortcuts.

Build/test state

  • dotnet build: green, 0 errors
  • dotnet test: 470 passed (361 core + 109 net), 0 failures
  • All commits on main

What to do next

PORT THE RETAIL COLLISION SYSTEM FROM SCRATCH.

The full plan is in memory/project_collision_port.md. The approach:

  1. Read the decompiled function (ground truth)
  2. Cross-reference ACE's C# (naming aid)
  3. Write pseudocode
  4. Port line-by-line to C#
  5. When ACE and decompiled disagree, decompiled wins

Files to port (ACE → acdream):

  • Sphere.cs → sphere-vs-sphere collision dispatcher (FUN_005387c0)
  • BSPTree.cs → find_collisions 6-path dispatcher
  • BSPNode.cs / BSPLeaf.cs → BSP traversal with movement
  • Polygon.cs → pos_hits_sphere with FindTimeOfCollision
  • Transition.cs → FindTransitionalPosition, TransitionalInsert
  • SpherePath.cs → sphere state management
  • LandCell.cs → outdoor terrain collision
  • EnvCell.cs → indoor room collision
  • ObjCell.cs → object collision + cell enumeration

What to keep:

  • CollisionPrimitives.cs (9 functions, faithfully ported from decompiled)
  • PhysicsDataCache.cs (dat loading — correct)
  • ShadowObjectRegistry.cs (cell bucketing — correct concept)
  • PhysicsBody.cs, MotionInterpreter.cs, PlayerWeenie.cs (correct)

What to replace:

  • BSPQuery.cs — simplified, not retail-faithful
  • TransitionTypes.cs Transition methods — patched, not retail-faithful
  • PhysicsEngine.ResolveWithTransition — may need restructuring