fix(physics): Task 3 follow-up — obstruction_ethereal consume for Cylinder+Sphere shapes
Retail oracle greps confirmed: - CSphere::intersects_sphere @ 0x00537ae4 (pc:321692): the ethereal branch is `void __thiscall` — all paths return void (no COLLIDED). The function performs a proximity check only; no blocking result is produced. - CCylSphere::intersects_sphere @ 0x0053b4a0 (pc:324573): same void-return pattern — ethereal branch calls collides_with_sphere (check only, no slide), all returns are void = passable. Change: added `if (sp.ObstructionEthereal) return TransitionState.OK` at the top of SphereCollision and CylinderCollision in TransitionTypes.cs, mirroring the void-return semantics of both retail functions. The existing per-object clear at pc:276989 (line 2837) still fires after the early OK return. Before this fix: an ethereal-alone NPC/ghost with a Cylinder or Sphere shadow shape would BLOCK the player (regression introduced when Task 3 made ETHEREAL- alone fall through ShouldSkip instead of instant-skipping). After: all three shape types — BSP (via BSPQuery Path 1), Sphere, and Cylinder — correctly pass through when obstruction_ethereal is set. Tests: added 4 tests to ObstructionEtherealTests.cs verifying: - Ethereal Cylinder → passable (sweep passes through, no CollisionNormalValid) - Ethereal Sphere → passable (same) - Non-ethereal Cylinder → still blocks (regression guard) - Non-ethereal Sphere → still blocks (regression guard) Full Core suite: 1584 pass, 0 fail, 2 skip (pre-existing dat skips). Pseudocode doc updated with confirmed cyl/sphere ethereal contracts and the complete set/clear/consume flow summary. Retail refs: - CSphere::intersects_sphere @ 0x00537ae4 / acclient_2013_pseudo_c.txt:321692 - CCylSphere::intersects_sphere @ 0x0053b4a0 / acclient_2013_pseudo_c.txt:324573 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik
parent
3361a8d776
commit
dc1e927080
3 changed files with 298 additions and 20 deletions
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@ -150,15 +150,43 @@ else:
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...
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...
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```
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```
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**acdream scope note:** `CylinderCollision` in `TransitionTypes.cs` does NOT implement
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**acdream implementation (Task 3 follow-up, 2026-06-24):** `CylinderCollision` in
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this gate. That is a separate task. Cylinder-type shadow entries for ETHEREAL objects
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`TransitionTypes.cs` now implements this gate as `if (sp.ObstructionEthereal) return OK`
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would not be blocked by the BSP path (BSP is separate), so the ETHEREAL Cyl gate
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at the top of the method — mirroring exactly how `SphereCollision` (consume site 1) is
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primarily matters for objects that are purely Cylinder (no BSP) — which is less common
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handled. The retail function is `void __thiscall`, so all returns in the ethereal branch
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than BSP objects. Task 3 scope covers BSP.
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are void (= OK). An ethereal Cylinder (e.g. an NPC ghost) is now fully passable.
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---
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---
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## Summary: set / clear / consume flow for Task 3
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## 3b. Consume site 1 — `CSphere::intersects_sphere` (pc:321692) — full contract
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The full decomp at pc:321692 / 0x537ae4 confirms:
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```
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// pc:321692:
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if (obstruction_ethereal != 0 || insert_type == PLACEMENT_INSERT):
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// distSq check — if sphere NOT overlapping: return (void = passable)
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if (distSq < radiusSumSq): // overlapping:
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// calls collides_with_sphere on sphere[1] if num_sphere > 1
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// returns void — no COLLIDED
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return // void = passable in all cases
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else:
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// step_down / check_walkable / slide blocking paths
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```
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**Key:** the `CSphere::intersects_sphere` function is `void __thiscall` — there is NO
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`return 2` (COLLIDED) from the ethereal branch. The inner `collides_with_sphere` call
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(for the penetrating case) also produces no blocking result (it may contribute to a
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side-channel contact; it does NOT stop the player). The player is passable in ALL
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sub-cases of the ethereal branch.
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**acdream implementation (Task 3 follow-up, 2026-06-24):** `SphereCollision` implements
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`if (sp.ObstructionEthereal) return OK` at the top. The inner overlap/slide path is
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bypassed — matches the void-return semantics of the retail ethereal branch.
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---
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## Summary: set / clear / consume flow (complete after Task 3 follow-up)
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```
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```
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FindObjCollisionsLoop():
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FindObjCollisionsLoop():
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@ -170,10 +198,10 @@ FindObjCollisionsLoop():
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// Set flag for ETHEREAL-alone
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// Set flag for ETHEREAL-alone
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sp.ObstructionEthereal = (obj.State & 0x4) != 0
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sp.ObstructionEthereal = (obj.State & 0x4) != 0
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// Shape dispatch (BSP path):
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// Shape dispatch — ALL three shapes now consume the flag:
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// BSPQuery.FindCollisions → Path 1 checks ObstructionEthereal
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// BSP: BSPQuery.FindCollisions Path 1 → sphere_intersects_solid (passable)
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// When ObstructionEthereal=true → sphere_intersects_solid (passable)
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// Sphere: SphereCollision → if (ObstructionEthereal) return OK
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// When ObstructionEthereal=false → normal blocking paths
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// Cylinder: CylinderCollision → if (ObstructionEthereal) return OK
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// Clear after per-object test (retail pc:276989)
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// Clear after per-object test (retail pc:276989)
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sp.ObstructionEthereal = false
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sp.ObstructionEthereal = false
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@ -183,10 +211,12 @@ FindEnvCollisions():
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// BSP dispatch against cell walls ...
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// BSP dispatch against cell walls ...
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```
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```
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**Contracts:**
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**Contracts (complete):**
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- ETHEREAL-only target (`state = 0x0001000C`): `ShouldSkip` returns false → flag set to
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- ETHEREAL-alone BSP target (e.g. open door): `ShouldSkip` = false → flag set → BSP
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true → BSP Path 1 fires → `sphere_intersects_solid` test → player walks through open
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Path 1 fires → `sphere_intersects_solid` → player walks through open door. Passable.
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door's BSP (no solid leaf at the opening) → OK → passable.
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- ETHEREAL-alone Sphere target (e.g. ghost NPC with sphere shape): flag set →
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- Non-ethereal wall: flag = false → Path 1 DOES NOT fire → normal blocking paths → player
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`SphereCollision` returns OK immediately. Passable.
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stopped.
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- ETHEREAL-alone Cylinder target (e.g. ghost NPC with cyl shape): flag set →
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- ENV cell walls: flag cleared before BSP dispatch → ENV BSP always uses the blocking path.
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`CylinderCollision` returns OK immediately. Passable.
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- Non-ethereal wall/object: flag = false → normal blocking paths. Blocked.
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- ENV cell walls: flag cleared before BSP dispatch → ENV BSP always blocking. Blocked.
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@ -2986,6 +2986,15 @@ public sealed class Transition
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/// </summary>
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/// </summary>
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private TransitionState SphereCollision(ShadowEntry obj, SpherePath sp)
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private TransitionState SphereCollision(ShadowEntry obj, SpherePath sp)
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{
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{
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// Consume site 1 — CSphere::intersects_sphere @ 0x00537ae4 (pc:321692).
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// When obstruction_ethereal is set (target is ETHEREAL-alone, state & 0x4),
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// the retail function is void and all paths in the ethereal branch return
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// without producing a COLLIDED/Slid result — the player is fully passable.
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// We mirror this by returning OK immediately, skipping all blocking paths.
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// Retail ref: acclient_2013_pseudo_c.txt:321692.
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if (sp.ObstructionEthereal)
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return TransitionState.OK;
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var ci = CollisionInfo;
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var ci = CollisionInfo;
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Vector3 sphereCurrPos = sp.GlobalCurrCenter[0].Origin;
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Vector3 sphereCurrPos = sp.GlobalCurrCenter[0].Origin;
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Vector3 sphereCheckPos = sp.GlobalSphere[0].Origin;
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Vector3 sphereCheckPos = sp.GlobalSphere[0].Origin;
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@ -3090,6 +3099,15 @@ public sealed class Transition
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/// </summary>
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/// </summary>
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private TransitionState CylinderCollision(ShadowEntry obj, SpherePath sp, PhysicsEngine engine)
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private TransitionState CylinderCollision(ShadowEntry obj, SpherePath sp, PhysicsEngine engine)
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{
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{
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// Consume site 2 — CCylSphere::intersects_sphere @ 0x0053b4a0 (pc:324573).
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// When obstruction_ethereal is set (target is ETHEREAL-alone, state & 0x4),
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// the retail function is void and all paths in the ethereal branch return
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// without producing a COLLIDED/Slid result — the player is fully passable.
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// We mirror this by returning OK immediately, skipping all blocking paths.
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// Retail ref: acclient_2013_pseudo_c.txt:324573.
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if (sp.ObstructionEthereal)
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return TransitionState.OK;
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var ci = CollisionInfo;
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var ci = CollisionInfo;
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var oi = ObjectInfo;
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var oi = ObjectInfo;
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Vector3 sphereCurrPos = sp.GlobalCurrCenter[0].Origin;
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Vector3 sphereCurrPos = sp.GlobalCurrCenter[0].Origin;
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@ -1,3 +1,4 @@
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using System.Numerics;
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using AcDream.Core.Physics;
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using AcDream.Core.Physics;
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using Xunit;
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using Xunit;
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@ -21,7 +22,7 @@ namespace AcDream.Core.Tests.Physics;
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/// </para>
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/// </para>
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///
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///
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/// <para>
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/// <para>
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/// Consume site: <c>BSPTREE::find_collisions @ 0x0053a496</c>
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/// Consume site 1: <c>BSPTREE::find_collisions @ 0x0053a496</c>
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/// (<c>acclient_2013_pseudo_c.txt:323742</c>): Path 1 fires when
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/// (<c>acclient_2013_pseudo_c.txt:323742</c>): Path 1 fires when
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/// <c>insert_type == PLACEMENT_INSERT || obstruction_ethereal != 0</c>,
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/// <c>insert_type == PLACEMENT_INSERT || obstruction_ethereal != 0</c>,
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/// routing to <c>sphere_intersects_solid</c> (passable-ethereal) instead
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/// routing to <c>sphere_intersects_solid</c> (passable-ethereal) instead
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@ -29,8 +30,34 @@ namespace AcDream.Core.Tests.Physics;
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/// </para>
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/// </para>
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///
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///
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/// <para>
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/// <para>
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/// Retail divergence register: row AD-7 retired in this commit — the
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/// Consume site 2: <c>CSphere::intersects_sphere @ 0x00537ae4</c>
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/// ETHEREAL-alone shim is replaced by the faithful port.
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/// (<c>acclient_2013_pseudo_c.txt:321692</c>): The ethereal branch performs
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/// a proximity check only (no push-back, no COLLIDED return). All code
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/// paths in the branch are void returns — the player is fully passable.
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/// </para>
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///
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/// <para>
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/// Consume site 3: <c>CCylSphere::intersects_sphere @ 0x0053b4a0</c>
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/// (<c>acclient_2013_pseudo_c.txt:324573</c>): Same pattern — the ethereal
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/// branch calls <c>collides_with_sphere</c> for an overlap check only, all
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/// returns are void, no COLLIDED result — the player is fully passable.
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/// </para>
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///
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/// <para>
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/// Task 3 follow-up (2026-06-24): the Sphere and Cylinder consume sites
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/// are now implemented in <c>SphereCollision</c> and <c>CylinderCollision</c>
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/// in <c>TransitionTypes.cs</c>. The tests below verify:
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/// <list type="bullet">
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/// <item>Ethereal-alone Cylinder target → passable (no CollisionNormalValid).</item>
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/// <item>Ethereal-alone Sphere target → passable (no CollisionNormalValid).</item>
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/// <item>Non-ethereal Cylinder target → still blocks (regression guard).</item>
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/// <item>Non-ethereal Sphere target → still blocks (regression guard).</item>
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/// </list>
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/// </para>
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///
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/// <para>
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/// Retail divergence register: row AD-7 retired in the original Task 3 commit —
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/// the ETHEREAL-alone shim is replaced by the faithful port.
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/// </para>
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/// </para>
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/// </summary>
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/// </summary>
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public class ObstructionEtherealTests
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public class ObstructionEtherealTests
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@ -87,6 +114,114 @@ public class ObstructionEtherealTests
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Assert.True(sp.ObstructionEthereal);
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Assert.True(sp.ObstructionEthereal);
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}
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}
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// ── Cylinder shape: ethereal-alone → passable ─────────────────────────
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//
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// Retail oracle: CCylSphere::intersects_sphere @ 0x0053b4a0 (pc:324573).
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// When obstruction_ethereal != 0, all code paths return void (no COLLIDED).
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// acdream mirrors this via `if (sp.ObstructionEthereal) return OK` at the
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// top of CylinderCollision, before any overlap/slide logic.
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[Fact]
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public void CylinderEtherealAlone_IsPassable()
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{
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// A Cylinder-type shadow with state=ETHEREAL_PS (0x4, no 0x10).
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// Player sphere sweeps directly into it. Expect NO collision response
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// (CollisionNormalValid must stay false throughout all 20 ticks).
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// Retail ref: CCylSphere::intersects_sphere pc:324573 — ethereal branch
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// does collides_with_sphere checks only (void return, never COLLIDED).
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var engine = BuildEngineWithSingleShadow(
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collisionType: ShadowCollisionType.Cylinder,
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objectState: ETHEREAL_PS,
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objectPos: new Vector3(12f, 12f, 0f),
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radius: 0.3f,
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cylHeight: 1.5f);
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// Approach dead-center from -Y, sweeping +Y through the cylinder.
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var start = new Vector3(12f, 11f, 0.48f);
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var perTick = new Vector3(0f, 0.10f, 0f);
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var (blocked, finalPos, _) = SweepUntilBlocked(engine, start, perTick, maxTicks: 20);
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Assert.False(blocked,
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$"Ethereal-alone Cylinder must be passable (no collision). " +
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$"Sphere stopped at ({finalPos.X:F3},{finalPos.Y:F3},{finalPos.Z:F3}).");
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}
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[Fact]
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public void CylinderNonEthereal_StillBlocks()
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{
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// Control: same Cylinder, state=0 (no ETHEREAL). Must still block.
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// This guards the regression that the ethereal gate does NOT affect
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// normal (non-ethereal) Cylinder objects.
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var engine = BuildEngineWithSingleShadow(
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collisionType: ShadowCollisionType.Cylinder,
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objectState: 0u, // no ethereal bit
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objectPos: new Vector3(12f, 12f, 0f),
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radius: 0.3f,
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cylHeight: 1.5f);
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var start = new Vector3(12f, 11f, 0.48f);
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var perTick = new Vector3(0f, 0.10f, 0f);
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var (blocked, finalPos, _) = SweepUntilBlocked(engine, start, perTick, maxTicks: 20);
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Assert.True(blocked,
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$"Non-ethereal Cylinder must still block. " +
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$"Sphere reached ({finalPos.X:F3},{finalPos.Y:F3},{finalPos.Z:F3}) after 20 ticks.");
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}
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// ── Sphere shape: ethereal-alone → passable ───────────────────────────
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//
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// Retail oracle: CSphere::intersects_sphere @ 0x00537ae4 (pc:321692).
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// When obstruction_ethereal != 0, all code paths return void (no COLLIDED).
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// acdream mirrors this via `if (sp.ObstructionEthereal) return OK` at the
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// top of SphereCollision.
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[Fact]
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public void SphereEtherealAlone_IsPassable()
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{
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// A Sphere-type shadow with state=ETHEREAL_PS (0x4, no 0x10).
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// Player sphere sweeps directly into it. Expect NO collision response.
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// Retail ref: CSphere::intersects_sphere pc:321692 — ethereal branch
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// does a proximity check only (void return, never COLLIDED / Slid).
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var engine = BuildEngineWithSingleShadow(
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collisionType: ShadowCollisionType.Sphere,
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objectState: ETHEREAL_PS,
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objectPos: new Vector3(12f, 12f, 0.48f),
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radius: 0.4f,
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cylHeight: 0f);
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var start = new Vector3(12f, 11f, 0.48f);
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var perTick = new Vector3(0f, 0.10f, 0f);
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var (blocked, finalPos, _) = SweepUntilBlocked(engine, start, perTick, maxTicks: 20);
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Assert.False(blocked,
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$"Ethereal-alone Sphere must be passable (no collision). " +
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$"Sphere stopped at ({finalPos.X:F3},{finalPos.Y:F3},{finalPos.Z:F3}).");
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}
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[Fact]
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public void SphereNonEthereal_StillBlocks()
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{
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// Control: same Sphere, state=0 (no ETHEREAL). Must still block.
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var engine = BuildEngineWithSingleShadow(
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collisionType: ShadowCollisionType.Sphere,
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objectState: 0u, // no ethereal bit
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objectPos: new Vector3(12f, 12f, 0.48f),
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radius: 0.4f,
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cylHeight: 0f);
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var start = new Vector3(12f, 11f, 0.48f);
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var perTick = new Vector3(0f, 0.10f, 0f);
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var (blocked, finalPos, _) = SweepUntilBlocked(engine, start, perTick, maxTicks: 20);
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Assert.True(blocked,
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$"Non-ethereal Sphere must still block. " +
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$"Sphere reached ({finalPos.X:F3},{finalPos.Y:F3},{finalPos.Z:F3}) after 20 ticks.");
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}
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// ── BSPQuery Path-1 gate: ObstructionEthereal routes through
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// ── BSPQuery Path-1 gate: ObstructionEthereal routes through
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// sphere_intersects_solid (not the blocking slide path) ──────────────
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// sphere_intersects_solid (not the blocking slide path) ──────────────
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//
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//
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@ -96,4 +231,99 @@ public class ObstructionEtherealTests
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// via the FindEnvCollisions D5 clear and the SpherePath property
|
// via the FindEnvCollisions D5 clear and the SpherePath property
|
||||||
// round-trip. The DoorCollisionApparatusTests and CellarUpTrajectory-
|
// round-trip. The DoorCollisionApparatusTests and CellarUpTrajectory-
|
||||||
// ReplayTests are the regression guards for the consume-site change.
|
// ReplayTests are the regression guards for the consume-site change.
|
||||||
|
|
||||||
|
// ── Helpers ───────────────────────────────────────────────────────────
|
||||||
|
|
||||||
|
private const uint TestLandblockId = 0xA9B40000u;
|
||||||
|
private const uint TestCellId = TestLandblockId | 0x0001u;
|
||||||
|
private const uint TestEntityId = 0xF4201u;
|
||||||
|
private const uint TestGfxObjId = 0xF4202u;
|
||||||
|
|
||||||
|
private const float SphereRadius = 0.48f;
|
||||||
|
private const float SphereHeight = 1.20f;
|
||||||
|
private const float StepUpHeight = 0.60f;
|
||||||
|
private const float StepDownHeight = 0.04f;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Build a minimal PhysicsEngine with a synthetic flat landblock
|
||||||
|
/// and a single registered shadow entry at <paramref name="objectPos"/>
|
||||||
|
/// with the given collision type and state bits.
|
||||||
|
/// No dat required — Cylinder and Sphere shapes need no GfxObj/BSP.
|
||||||
|
/// </summary>
|
||||||
|
private static PhysicsEngine BuildEngineWithSingleShadow(
|
||||||
|
ShadowCollisionType collisionType,
|
||||||
|
uint objectState,
|
||||||
|
Vector3 objectPos,
|
||||||
|
float radius,
|
||||||
|
float cylHeight)
|
||||||
|
{
|
||||||
|
var cache = new PhysicsDataCache();
|
||||||
|
var engine = new PhysicsEngine { DataCache = cache };
|
||||||
|
|
||||||
|
// Stub landblock: flat terrain far below so it never interferes.
|
||||||
|
var heights = new byte[81];
|
||||||
|
var heightTable = new float[256];
|
||||||
|
for (int i = 0; i < 256; i++) heightTable[i] = -1000f;
|
||||||
|
engine.AddLandblock(
|
||||||
|
landblockId: TestLandblockId,
|
||||||
|
terrain: new TerrainSurface(heights, heightTable),
|
||||||
|
cells: System.Array.Empty<CellSurface>(),
|
||||||
|
portals: System.Array.Empty<PortalPlane>(),
|
||||||
|
worldOffsetX: 0f,
|
||||||
|
worldOffsetY: 0f);
|
||||||
|
|
||||||
|
// Register the target shadow. Cylinder/Sphere shapes don't need a
|
||||||
|
// GfxObj BSP in the cache — FindObjCollisions only queries the cache
|
||||||
|
// for BSP collision types.
|
||||||
|
engine.ShadowObjects.Register(
|
||||||
|
entityId: TestEntityId,
|
||||||
|
gfxObjId: TestGfxObjId,
|
||||||
|
worldPos: objectPos,
|
||||||
|
rotation: System.Numerics.Quaternion.Identity,
|
||||||
|
radius: radius,
|
||||||
|
worldOffsetX: 0f,
|
||||||
|
worldOffsetY: 0f,
|
||||||
|
landblockId: TestLandblockId,
|
||||||
|
collisionType: collisionType,
|
||||||
|
cylHeight: cylHeight,
|
||||||
|
scale: 1.0f,
|
||||||
|
state: objectState,
|
||||||
|
flags: EntityCollisionFlags.None);
|
||||||
|
|
||||||
|
return engine;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Sweep a player sphere by <paramref name="perTick"/> each step until
|
||||||
|
/// <c>CollisionNormalValid</c> fires or <paramref name="maxTicks"/> elapse.
|
||||||
|
/// </summary>
|
||||||
|
private static (bool blocked, Vector3 finalPos, Vector3 normal)
|
||||||
|
SweepUntilBlocked(PhysicsEngine engine, Vector3 start, Vector3 perTick, int maxTicks)
|
||||||
|
{
|
||||||
|
Vector3 pos = start;
|
||||||
|
uint cellId = TestCellId;
|
||||||
|
bool onGround = false;
|
||||||
|
|
||||||
|
for (int tick = 0; tick < maxTicks; tick++)
|
||||||
|
{
|
||||||
|
Vector3 target = pos + perTick;
|
||||||
|
var result = engine.ResolveWithTransition(
|
||||||
|
pos, target, cellId,
|
||||||
|
SphereRadius, SphereHeight,
|
||||||
|
StepUpHeight, StepDownHeight,
|
||||||
|
onGround,
|
||||||
|
body: null,
|
||||||
|
moverFlags: ObjectInfoState.IsPlayer | ObjectInfoState.EdgeSlide,
|
||||||
|
movingEntityId: 0);
|
||||||
|
|
||||||
|
if (result.CollisionNormalValid)
|
||||||
|
return (true, result.Position, result.CollisionNormal);
|
||||||
|
|
||||||
|
pos = result.Position;
|
||||||
|
cellId = result.CellId;
|
||||||
|
onGround = result.IsOnGround;
|
||||||
|
}
|
||||||
|
|
||||||
|
return (false, pos, Vector3.Zero);
|
||||||
|
}
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue