From 3635f295b22ffe50d555cf4c0e6d2d3e1ec1e172 Mon Sep 17 00:00:00 2001
From: gaozheng <gaozheng.cn@gmail.com>
Date: Wed, 17 Jun 2026 18:05:30 +0800
Subject: [PATCH] =?UTF-8?q?fix(vtk):=20=E6=8B=89=E6=9C=80=E8=BF=9C?=
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---
 src/app/TileBasemap.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/app/TileBasemap.cpp b/src/app/TileBasemap.cpp
index e403a52..da7255b 100644
--- a/src/app/TileBasemap.cpp
+++ b/src/app/TileBasemap.cpp
@@ -234,7 +234,9 @@ void TileBasemap::refineTile(int z, int x, int y, std::set<long long>& out, int&
         const double dist = std::max(1.0, std::sqrt(dx * dx + dy * dy + dz * dz));
         screenPx = g * projK_ / dist;  // 透视：projK_ = H/(2·tan(vfov/2))
     }
-    if (screenPx > kTargetPx && z < kMaxZoom) {
+    // 细分条件：屏幕上太大 → 细分(近细远粗)；或瓦片本身比允许范围还大 → 也强制细分，
+    // 否则拉到最远时一块巨瓦(如 78km)正好盖住数据中心、过不了距离剔除 → 覆盖超大面积。
+    if ((screenPx > kTargetPx || g > maxTileDist_) && z < kMaxZoom) {
         refineTile(z + 1, 2 * x, 2 * y, out, count);
         refineTile(z + 1, 2 * x + 1, 2 * y, out, count);
         refineTile(z + 1, 2 * x, 2 * y + 1, out, count);