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refactor(vtk): TileBasemap groundZ 参数化支持多实例平面底图

This commit is contained in:
gaozheng 2026-06-30 23:46:44 +08:00
parent 15c30a5821
commit 55085208bb
2 changed files with 8 additions and 6 deletions
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10
src/app/TileBasemap.cpp
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@ -52,7 +52,6 @@ constexpr double kRangeCeil = 30000.0; // 最多 30km(防远裁剪面失控)
constexpr int kMaxConcurrent = 12; // 瓦片请求最大并发(天地图 8 子域+Mapbox，适度提高吞吐)
constexpr int kMinZoom = 3;
constexpr int kMaxZoom = 18;
constexpr double kGroundZ = 0.0; // 底图置于 z=0 地面参考（剖面深度向下为负，落其下）
constexpr double kZEps = 0.02; // 每层级 Z 微偏移：高层级压上面，避免共面瓦片 z-fighting
constexpr int kHardCap = 400; // 瓦片硬上限：超过则即便未落地也强制清理，兜底内存
constexpr double kPi = 3.14159265358979323846;
@ -120,8 +119,9 @@ long long TileBasemap::tileKey(int z, int x, int y) {
}
TileBasemap::TileBasemap(geopro::render::Scene& scene, vtkRenderWindow* rw,
std::shared_ptr<geopro::core::GeoLocalFrame> frame, QObject* parent)
: QObject(parent), scene_(scene), rw_(rw), frame_(std::move(frame)) {}
std::shared_ptr<geopro::core::GeoLocalFrame> frame, QObject* parent,
double groundZ)
: QObject(parent), scene_(scene), rw_(rw), frame_(std::move(frame)), groundZ_(groundZ) {}
void TileBasemap::requestRender() {
// 合并渲染：同一事件循环轮次内的多次请求只渲染一帧（标准做法，避免逐瓦片重复 Render 卡顿）。
@ -445,7 +445,7 @@ vtkSmartPointer<vtkActor> TileBasemap::buildFlat(int z, int x, int y,
const auto sw = frame_->toLocal(b.south, b.west);
const auto se = frame_->toLocal(b.south, b.east);
const auto nw = frame_->toLocal(b.north, b.west);
const double gz = kGroundZ + (z - kMinZoom) * kZEps; // 高层级略抬高，压在旧层之上防共面闪烁
const double gz = groundZ_ + (z - kMinZoom) * kZEps; // 高层级略抬高，压在旧层之上防共面闪烁
// PlaneSource 自动 tcoord：origin=SW→u 西0东1、v 南0北1（与翻转后纹理对齐）。
vtkNew<vtkPlaneSource> plane;
@ -534,7 +534,7 @@ vtkSmartPointer<vtkActor> TileBasemap::buildWarped(int sz, int sx, int sy, int d
const auto sw = frame_->toLocal(sb.south, sb.west);
const auto se = frame_->toLocal(sb.south, sb.east);
const auto nw = frame_->toLocal(sb.north, sb.west);
const double base = kGroundZ + (sz - kMinZoom) * kZEps;
const double base = groundZ_ + (sz - kMinZoom) * kZEps;
// PlaneSource(等距圆柱下平面插值即正确 x/y) + 自动 tcoord；再按各点真实经纬采 DEM 位移 Z。
vtkNew<vtkPlaneSource> plane;

4
src/app/TileBasemap.hpp
View File

@ -33,7 +33,8 @@ class TileBasemap : public QObject {
public:
enum Kind { Street = 0, Satellite = 1, Hidden = 2 };
TileBasemap(geopro::render::Scene& scene, vtkRenderWindow* rw,
std::shared_ptr<geopro::core::GeoLocalFrame> frame, QObject* parent = nullptr);
std::shared_ptr<geopro::core::GeoLocalFrame> frame, QObject* parent = nullptr,
double groundZ = 0.0);
~TileBasemap() override;
void show(Kind kind); // 显示某底图（Hidden 等同 hide）；记住类型供 LOD 刷新复用
@ -76,6 +77,7 @@ private:
std::set<long long> inFlight_; // 在途瓦片(续到起伏/平面最终落地)
std::map<long long, QImage> demCache_; // DEM 块缓存(key=DEMz/x/y)，跨隐藏/重选复用
std::map<long long, vtkSmartPointer<vtkTexture>> texCache_; // 影像纹理缓存，重选/缩放回看免重拉
double groundZ_ = 0.0; // 底图地面参考 z(per-instance)：3D 底图=0；2D 平面底图=各类型平面高程
double ve_ = 1.0; // 地形垂向夸张(与剖面 verticalExaggeration 一致才对齐)
double opacity_ = 0.5; // 底图半透明：地下剖面可从任意角度透过地面看到(不再被遮挡)
double maxTileDist_ = 2000.0; // 底图最大距离(米)，每次刷新按剖面范围动态算