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fix: look up the scene at a position as the client does, in constant time

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Chunk bounds span (width - 1) * scale; the nearest scene map cell is used and the far edge is kept one cell inside. Chunks are indexed by grid cell when they form a grid. Skipping reads instead of seeking, so a cut-off file can't seek past the end. Terrain mesh indices follow the vertex order.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-10-16 11:13:19 -05:00
parent 53d4c1fe2f
commit 200958dd79
5 changed files with 200 additions and 90 deletions
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33
dZoneManager/dZoneManager.cpp
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@@ -12,7 +12,6 @@
#include "CDZoneTableTable.h"
#include <algorithm>
#include <chrono>
#include <cmath>
#include <set>
#include "eObjectBits.h"
#include "AssetManager.h"
@@ -307,36 +306,8 @@ void dZoneManager::LoadWorldConfig() {
LWOSCENEID dZoneManager::GetSceneIDFromPosition(const NiPoint3& position) const {
if (!m_pZone) return LWOSCENEID_INVALID;
const auto& raw = m_pZone->GetZoneRaw();
// If no chunks, no scene data available
if (raw.chunks.empty()) {
return LWOSCENEID_INVALID;
}
// Convert 3D position to 2D (XZ plane) and clamp to terrain bounds
float posX = std::clamp(position.x, raw.minBoundsX, raw.maxBoundsX);
float posZ = std::clamp(position.z, raw.minBoundsZ, raw.maxBoundsZ);
// Find the chunk containing this position
// Reverse the world position calculation from GenerateTerrainMesh
for (const auto& chunk : raw.chunks) {
if (!chunk.IsValidForSceneLookup()) continue;
const float heightI = posX / chunk.scaleFactor - (chunk.offsetX / chunk.scaleFactor);
const float heightJ = posZ / chunk.scaleFactor - (chunk.offsetZ / chunk.scaleFactor);
if (heightI >= 0.0f && heightI < static_cast<float>(chunk.width) &&
heightJ >= 0.0f && heightJ < static_cast<float>(chunk.height)) {
const uint32_t gridI = std::min(static_cast<uint32_t>(heightI), chunk.width - 1);
const uint32_t gridJ = std::min(static_cast<uint32_t>(heightJ), chunk.height - 1);
return LWOSCENEID(chunk.GetSceneIDAtGrid(gridI, gridJ), 0);
}
}
// Position not found in any chunk
return LWOSCENEID_INVALID;
const auto sceneID = m_pZone->GetZoneRaw().GetSceneIDAt(position.x, position.z);
return sceneID ? LWOSCENEID(*sceneID, 0) : LWOSCENEID_INVALID;
}
void dZoneManager::BuildSceneGraph() {