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fix(vtk): 瓦片视锥剔除只用4侧面不用近/远裁剪面-根治首帧远处瓦片被随几何变化的远裁剪面误剔除(等多久不出/微动才出)

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gaozheng 2026-06-17 15:45:57 +08:00
parent e15930d8fb
commit 692ee057ab
1 changed files with 4 additions and 2 deletions
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6
src/app/TileBasemap.cpp
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@ -223,9 +223,11 @@ void TileBasemap::refineTile(int z, int x, int y, std::set<long long>& out, int&
const auto sw = frame_->toLocal(b.south, b.west); const auto sw = frame_->toLocal(b.south, b.west);
const auto ne = frame_->toLocal(b.north, b.east); const auto ne = frame_->toLocal(b.north, b.east);
// 视锥剔除：瓦片 AABB 全在某视锥面外侧 → 不在视野内，直接丢弃(否则会在屏幕外乱细分耗尽预算)。 // 视锥剔除：瓦片 AABB 全在某侧面外侧 → 不在视野内，丢弃(否则屏幕外乱细分耗尽预算)。
// 只用 4 个侧面(左右上下)，不用近/远裁剪面——远裁剪面随已加载几何变化，
// 首帧底图未齐时远面贴得近会误剔除远处可见瓦片(等多久都不出、微动才出)。
const double zmin = -1000.0, zmax = 1000.0; // 地形起伏远小于瓦片尺度，给宽松 z 带 const double zmin = -1000.0, zmax = 1000.0; // 地形起伏远小于瓦片尺度，给宽松 z 带
for (int p = 0; p < 6; ++p) { for (int p = 0; p < 4; ++p) {
const double* pl = &frustum_[p * 4]; // 内法向：内侧 a·x+b·y+c·z+d ≥ 0 const double* pl = &frustum_[p * 4]; // 内法向：内侧 a·x+b·y+c·z+d ≥ 0
const double vx = pl[0] >= 0 ? ne.x : sw.x; // 取最朝法向的角点(p-vertex) const double vx = pl[0] >= 0 ? ne.x : sw.x; // 取最朝法向的角点(p-vertex)
const double vy = pl[1] >= 0 ? ne.y : sw.y; const double vy = pl[1] >= 0 ? ne.y : sw.y;