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Modern open-source C# .NET 10 Asheron's Call client. Faithful port of retail client behaviour to Silk.NET with a plugin API.
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Erik 3ae7f5e7ae fix(physics): correct terrain Z sampling triangle layout in TerrainSurface 
The SampleZ method had the two triangle-boundary conditions swapped relative
to what the mesh index buffer actually renders, causing the physics Z to
sample from the wrong triangle on roughly half of all terrain cells. The
error could be up to 7.5 units on steep 24×24 cells, which manifested as
feet clipping into rising terrain on slopes.

Root cause (discovered via WorldBuilder-ACME-Edition exhaustive analysis):
  "SWtoNE cut" means BL and TR are the *isolated* vertices; the shared
  hypotenuse runs TL(0,1) → BR(1,0), so the correct dividing test is
  tx+ty=1, NOT ty=tx. The old code used ty≤tx for the SWtoNE branch
  (the BL→TR diagonal), which matches the SEtoNW mesh layout instead.

Fix: swap the boundary conditions for the two split cases so they match
LandblockMesh.cs's actual index buffer layout:
  SWtoNE: tx+ty ≤ 1 → BL+BR+TL, else TR+TL+BR
  SEtoNW: ty ≤ tx  → BL+BR+TR, else BL+TR+TL

Verified by running all three formulas (acdream, ACME GetHeight, ACME
HeightSampler) against the mesh index buffer at 50 interior points across
both split types: fixed version matches 0 errors, old version had 50.
All 283 tests still pass.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-12 22:25:32 +02:00
docs docs: movement deep dive — AC2D + holtburger cross-reference 2026-04-12 21:52:12 +02:00
src fix(physics): correct terrain Z sampling triangle layout in TerrainSurface 2026-04-12 22:25:32 +02:00
tests fix(app): multi-point Z sampling + never-cull player landblock 2026-04-12 21:29:54 +02:00
.gitignore chore: phase 0 — skeleton + dat asset inventory 2026-04-10 09:02:56 +02:00
AcDream.slnx feat(net): AcDream.Core.Net scaffold + ISAAC keystream (Phase 4.1) 2026-04-11 14:14:28 +02:00
CLAUDE.md docs: movement deep dive — AC2D + holtburger cross-reference 2026-04-12 21:52:12 +02:00
README.md chore: phase 0 — skeleton + dat asset inventory 2026-04-10 09:02:56 +02:00

README.md

acdream

Experimental modern open-source Asheron's Call client in C# / .NET 10.

Status: pre-alpha, not playable. Phase 0 only — dat file asset inventory.

Stack: .NET 10, Chorizite.DatReaderWriter for dat parsing. Silk.NET + Avalonia planned for rendering/UI (not yet wired up).

Requires: A retail Asheron's Call install (Turbine/Microsoft property — supply your own). Set ACDREAM_DAT_DIR environment variable to the directory containing client_portal.dat, client_cell_1.dat, client_highres.dat, and client_local_English.dat, or pass it as the first CLI argument.

Layout

  • src/AcDream.Cli/ — console app that dumps asset counts from a dat directory
  • references/ — local read-only reference material (ACE, ACViewer, WorldBuilder, DatReaderWriter, holtburger, retail AC install). Gitignored.

Run

dotnet run --project src/AcDream.Cli -- "C:\path\to\Asheron's Call"

Or set ACDREAM_DAT_DIR and run without args.