进一步优化

libs/MVS/SceneTexture.cpp

@@ -18543,6 +18543,176 @@ bool MeshTexture::SelectBestViewsForVirtualFaces(
     DEBUG_EXTRA("Fallback by center face  : %zu", fallbackByCenterFace);
     DEBUG_EXTRA("=================================================");
 
+	// ================================================================
+// ★★★ 连通域强制统一视角（消除色差碎片）★★★
+// ================================================================
+{
+    TD_TIMER_START();
+    
+    const FIndex NF = (FIndex)faceToView.size();
+    if (NF == 0) return true;
+    
+    // 1. 构建面片邻接关系（只考虑有效面片）
+    std::vector<std::vector<FIndex>> adjList(NF);
+    for (FIndex fid = 0; fid < NF; ++fid) {
+        if (faceToView[fid] == NO_ID) continue;
+        if (fid >= (FIndex)scene.mesh.faceFaces.size()) continue;
+        
+        const Mesh::FaceFaces& neighbors = scene.mesh.faceFaces[fid];
+        for (int k = 0; k < 3; ++k) {
+            FIndex nb = neighbors[k];
+            if (nb == NO_ID || nb >= NF) continue;
+            if (faceToView[nb] == NO_ID) continue;
+            adjList[fid].push_back(nb);
+        }
+    }
+    
+    // 2. 连通域标记（BFS）
+    std::vector<int> component(NF, -1);
+    int numComponents = 0;
+    
+    for (FIndex fid = 0; fid < NF; ++fid) {
+        if (faceToView[fid] == NO_ID) continue;
+        if (component[fid] >= 0) continue;
+        
+        std::queue<FIndex> q;
+        q.push(fid);
+        component[fid] = numComponents;
+        
+        while (!q.empty()) {
+            FIndex cur = q.front(); q.pop();
+            for (FIndex nb : adjList[cur]) {
+                if (component[nb] < 0) {
+                    component[nb] = numComponents;
+                    q.push(nb);
+                }
+            }
+        }
+        numComponents++;
+    }
+    
+    DEBUG_EXTRA("Connected components: %d components from %d faces", numComponents, NF);
+    
+    // 3. 统计每个连通域的视角分布
+    struct CompInfo {
+        std::vector<FIndex> faces;
+        std::map<IIndex, int> viewVotes;
+        std::map<IIndex, float> viewScoreSum;
+        std::map<IIndex, float> viewAvgScore;
+    };
+    std::vector<CompInfo> comps(numComponents);
+    
+    for (FIndex fid = 0; fid < NF; ++fid) {
+        if (faceToView[fid] == NO_ID) continue;
+        int c = component[fid];
+        if (c < 0) continue;
+        
+        IIndex vid = faceToView[fid];
+        float score = faceScores[fid];
+        
+        comps[c].faces.push_back(fid);
+        comps[c].viewVotes[vid]++;
+        comps[c].viewScoreSum[vid] += score;
+    }
+    
+    for (int c = 0; c < numComponents; ++c) {
+        for (auto& vs : comps[c].viewScoreSum) {
+            IIndex vid = vs.first;
+            int votes = comps[c].viewVotes[vid];
+            comps[c].viewAvgScore[vid] = vs.second / votes;
+        }
+    }
+    
+    // 4. 每个连通域选最佳视角
+    int changedFaces = 0;
+    int smallComponents = 0;
+    
+    for (int c = 0; c < numComponents; ++c) {
+        auto& comp = comps[c];
+        if (comp.faces.empty()) continue;
+        
+        // 小连通域合并
+        if ((int)comp.faces.size() < 5) {
+            smallComponents++;
+            
+            std::map<int, int> neighborCompVotes;
+            for (FIndex fid : comp.faces) {
+                for (FIndex nb : adjList[fid]) {
+                    int nc = component[nb];
+                    if (nc >= 0 && nc != c) {
+                        neighborCompVotes[nc]++;
+                    }
+                }
+            }
+            
+            if (!neighborCompVotes.empty()) {
+                auto bestNb = std::max_element(neighborCompVotes.begin(), neighborCompVotes.end(),
+                    [](const auto& a, const auto& b) { return a.second < b.second; });
+                
+                int targetComp = bestNb->first;
+                IIndex targetView = NO_ID;
+                int maxVotes = 0;
+                for (const auto& vv : comps[targetComp].viewVotes) {
+                    if (vv.second > maxVotes) {
+                        maxVotes = vv.second;
+                        targetView = vv.first;
+                    }
+                }
+                
+                if (targetView != NO_ID) {
+                    for (FIndex fid : comp.faces) {
+                        if (faceToView[fid] != targetView) {
+                            faceToView[fid] = targetView;
+                            faceScores[fid] = comps[targetComp].viewAvgScore[targetView];
+                            changedFaces++;
+                        }
+                    }
+                }
+                continue;
+            }
+        }
+        
+        // 正常连通域选视角
+        IIndex bestView = NO_ID;
+        float bestWeightedScore = -FLT_MAX;
+        int totalFaces = (int)comp.faces.size();
+        
+        for (const auto& vv : comp.viewVotes) {
+            IIndex vid = vv.first;
+            int votes = vv.second;
+            float avgScore = comp.viewAvgScore[vid];
+            
+            float voteRatio = (float)votes / totalFaces;
+            float normalizedScore = std::max(0.0f, std::min(1.0f, avgScore));
+            float weightedScore = 0.6f * voteRatio + 0.4f * normalizedScore;
+            
+            if (weightedScore > bestWeightedScore) {
+                bestWeightedScore = weightedScore;
+                bestView = vid;
+            }
+        }
+        
+        if (bestView == NO_ID) continue;
+        
+        for (FIndex fid : comp.faces) {
+            if (faceToView[fid] != bestView) {
+                faceToView[fid] = bestView;
+                faceScores[fid] = comp.viewAvgScore[bestView];
+                changedFaces++;
+            }
+        }
+    }
+    
+    DEBUG_EXTRA("Component unification: %d faces changed, %d small components merged (%s)",
+                changedFaces, smallComponents, TD_TIMER_GET_FMT().c_str());
+    
+    // ★★★ 注意：不要在这里更新 faceViews/faceViewWeights！
+    // faceViews 会在视图选择阶段的末尾，由 SelectBestViewsForVirtualFaces 根据 faceToView 重建
+    // 如果在这里强行同步，会破坏虚拟面片与视图的映射关系，导致采样坐标错误
+    
+    DEBUG_EXTRA("Unification complete: %d components processed.", numComponents);
+}
+
     return true;
 }