本文介紹了實景模型的用途、基本構成以及快速入門等內容。
模型用途
簡介
實景模型是一種以分析、渲染為主要用途的三維模型存儲結構，Ganos Scene是對象關系型數據庫PostgreSQL兼容版本（PolarDB PostgreSQL版（兼容Oracle））的一個時空引擎擴展，它保留了三維模型的一切信息，包括：材質、紋理、骨骼、動畫等，力爭最大程度還原模型本身的各類信息。
功能概述
Scene原生支持傾斜攝影、glTF等場景數據入庫一體化管理。引擎采用了多級數據視圖的組合關聯技術，解決了超大對象存儲和高效存取難題。
Scene增強了對地心坐標系（ECEF）、站心坐標系（ENU）的支持，實現地理坐標數據與三維實景數據的一體化處理與分析。
Scene支持三維實景數據的空間關系判斷、閉合裁剪、幾何簡化、紋理重組等操作，能夠達到城市級海量三維實景數據的秒級提取呈現。
Scene兼容多種外部格式的直接輸入，如：OSGB、GLTF、GLB等格式。
功能詳情請參見Scene SQL參考。
主要業務場景
在實際應用中，Scene可以用于三維空間數據的存儲、分析和可視化：
傾斜攝影數據管理和可視化
傾斜攝影數據管理一直是測繪信息領域的重要工作，大多用于三維底圖的展示。基于Ganos Scene類型可以實現傾斜攝影數據的導入-存儲-計算-渲染支持全套方案，在不造成數據冗余的情況下，構建了視算一體的“空間數據一庫統管”能力。此外，Ganos支持將數據保留至對象存儲，僅在庫內構建類型，這種情況下依然可以對傾斜攝影對象開展各類空間查詢、分析與渲染操作，可以有效地降低用戶成本。
空間數據挖掘
Ganos Scene提供了完備的跨模空間關系查詢能力，可以用于空間數據挖掘等多種場景。如查詢多個建筑物之間是否有重疊（判斷兩個三維空間對象之間的相交關系）、某個建筑物周圍或某個地理范圍內的其他建筑物（判斷兩個三維空間對象之間的包含關系）等，還可以從三維場景中提取出感興趣的區域或對象（如園區中的單個建筑物，包含幾何形狀、表面屬性等信息），以支持后續的分析和應用。
園區/城市管理與規劃
Ganos Scene提供了先進的空間分析能力，如可視域分析與陰影率分析，可以直接在數據庫內進行計算分析以支持更加復雜的業務場景，擺脫了對前端GPU的依賴。可視域分析能力可以應用于輔助園區內攝像頭的布設、重大活動重點路線安保規劃等場景，陰影率分析能力可以應用于建筑或太陽能電站選址、設計等場景，幫助設計者和決策者實現科學規劃與管理。此外，Ganos Scene還提供了三維模型簡化、紋理裁剪與簡化等輕量化能力，可以提高計算效率，加快前端的渲染速度，更好地服務于上層應用。
基本構成
概述
在Ganos中，Scene模型包含了glTF、OSGB兩種標準數據類型。一般是基于遙感測繪、智能感知等新型技術手段，對真實物理世界的場景進行三維虛擬重建，包括傾斜攝影數據、三維表面建模數據等，具有數據規模大、顯示屬性多、自定義結構復雜等特性。Scene類型實現了數據資產集約化管理，解決大規模三維真實場景檢索、分析效率慢、超大型三維模型“只能看，算不動”等問題，可以支持復雜的空間查詢與分析。常用于城市的數字化底座，虛擬現實等場景。
類型
glTF 類型
glTF（Graphics Language Transmission Format）是一種3D文件格式，以JSON格式存儲3D模型信息，旨在減少3D資產的大小以及解壓和使用這些資產所需的處理時間。glTF文件可以使用.gltf（JSON/ASCII）擴展名或.glb（二進制）擴展名，無論是.gltf還是.glb文件都可以引用外部的二進制數據和紋理資源。glTF支持描述3D模型的幾何形狀、外觀、場景層次結構和動畫等，被廣泛應用于3D場景、模型的高效傳輸和加載。
glTF這種跨平臺格式已成為Web上的3D對象標準。它由OpenGL和Vulkan背后的3D圖形標準組織Khronos所定義，這使得glTF基本上成為3D模型的JPG格式：Web導出的通用標準。
OSGB 類型
OSGB（OpenSceneGraph Binary）是一種二進制文件格式，用于存儲三維圖形和場景數據。它是OpenSceneGraph（一種開源的三維圖形渲染引擎）中使用的默認文件格式之一。OSGB包含了場景的幾何形狀、材質、紋理、光照、動畫等數據，提供了高效的數據存儲和讀取性能，同時支持壓縮和隨機訪問。OSGB可以被OpenSceneGraph引擎加載和渲染，以創建交互式的三維圖形應用程序，被廣泛用于視覺模擬、游戲、虛擬現實、科學可視化和建模等領域。
空間參考系
空間參考系（Spatial Reference System，以下簡稱為SRS ）定義了如何將Scene對象關聯到地球表面上某個具體位置。
Ganos使用一個整數來表示SRS的定義引用，稱為SRID。Scene對象通過其自身的SRID值與SRS關聯。
更多內容請參見空間參考。
數據列視圖
在Ganos中，scene_columns是從數據庫系統目錄表中讀取全部Scene類型相關列的視圖。該視圖遵循了OGC的Simple Features Specification for SQL標準并進行可對應的擴展。 該視圖結構如下：
列名 | 類型 | 說明 |
f_table_catalog | varchar(256) | 所在數據庫的名稱。 |
f_table_schema | name | 該表所在的schema。 |
f_table_name | name | 該表的表名。 |
f_scene_column | name | 該表中某個Scene類型列的列名。 |
可以通過如下語句查詢當前數據庫中全部Scene類型數據列：
SELECT * FROM scene_columns;索引
空間索引使Ganos處理大型空間數據集時避免對數據庫進行全局“順序掃描”。索引通過將數據組織到搜索樹中來加速搜索，可以快速遍歷該搜索樹以查找特定記錄。
Ganos為Scene數據提供了GiST空間索引：
索引名稱 | 索引說明 | 索引特點 |
GiST (Generalized Search Tree) | GiST索引基于模型外包框提供了相交、包含等空間關系的快速查詢。 | GiST是最常用、最通用的空間索引方法，提供非常好的查詢性能。 |
可通過以下方式創建索引：
CREATE INDEX <index_name>
ON <table_name>
USING GIST(<column_name>);快速入門
簡介
快速入門文檔幫助用戶快速理解Ganos Scene引擎的基本用法，包括擴展創建、建表、插入數據、查詢結果、創建索引、空間查詢等內容。
更多專業用法可參考Scene最佳實踐文章：
語法說明
創建擴展。
CREATE EXTENSION Ganos_scene CASCADE;說明建議將擴展安裝在public模式下，避免權限問題。
CREATE extension Ganos_scene WITH schema public cascade;創建具有Scene字段的表。
CREATE TABLE t_scene( id integer, data scene );插入數據。
--向表中插入數據 INSERT INTO t_scene(id, data) VALUES (1, '{"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5126,"count":42,"max":[1.0,1.0,1.0],"min":[-1.0,-1.0,-1.0],"type":"VEC3"},{"bufferView":1,"componentType":5126,"count":42,"max":[1.0,1.0,1.0],"min":[-1.0,-1.0,-1.0],"type":"VEC3"},{"bufferView":2,"componentType":5126,"count":42,"max":[0.0],"min":[0.0],"type":"SCALAR"},{"bufferView":3,"componentType":5121,"count":240,"max":[41],"min":[0],"type":"SCALAR"}],"asset":{"generator":"Ganos Scene","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":504,"target":34962},{"buffer":0,"byteLength":504,"byteOffset":504,"target":34962},{"buffer":0,"byteLength":168,"byteOffset":1008,"target":34962},{"buffer":0,"byteLength":240,"byteOffset":1176,"target":34963}],"buffers":[{"byteLength":1416,"uri":"data:application/octet-stream;base64,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"}],"meshes":[{"primitives":[{"attributes":{"NORMAL":1,"POSITION":0,"_USER_1":2},"indices":3,"mode":4}]}],"nodes":[{"mesh":0}],"scenes":[{"nodes":[0]}]}}'::scene), (2, '{"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5121,"count":36,"max":[7],"min":[0],"type":"SCALAR"},{"bufferView":1,"componentType":5126,"count":8,"max":[2.5,0.5,0.5],"min":[1.5,-0.5,-0.5],"type":"VEC3"}],"asset":{"generator":"ganos","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":36,"target":34963},{"buffer":0,"byteLength":96,"byteOffset":36,"target":34962}],"buffers":[{"byteLength":132,"uri":"data:application/octet-stream;base64,AgEAAQIDBAIAAgQGAQQABAEFBgUHBQYEAwYHBgMCBQMHAwUBAADAPwAAAL8AAAC/AAAgQAAAAL8AAAC/AADAPwAAAD8AAAC/AAAgQAAAAD8AAAC/AADAPwAAAL8AAAA/AAAgQAAAAL8AAAA/AADAPwAAAD8AAAA/AAAgQAAAAD8AAAA/"}],"meshes":[{"primitives":[{"attributes":{"POSITION":1},"indices":0,"mode":4}]}],"nodes":[{"mesh":0}],"scenes":[{"nodes":[0]}]}}'::scene), (3, '{"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5121,"count":36,"max":[7],"min":[0],"type":"SCALAR"},{"bufferView":1,"componentType":5126,"count":8,"max":[6.5,0.5,0.5],"min":[5.5,-0.5,-0.5],"type":"VEC3"}],"asset":{"generator":"ganos","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":36,"target":34963},{"buffer":0,"byteLength":96,"byteOffset":36,"target":34962}],"buffers":[{"byteLength":132,"uri":"data:application/octet-stream;base64,AgEAAQIDBAIAAgQGAQQABAEFBgUHBQYEAwYHBgMCBQMHAwUBAACwQAAAAL8AAAC/AADQQAAAAL8AAAC/AACwQAAAAD8AAAC/AADQQAAAAD8AAAC/AACwQAAAAL8AAAA/AADQQAAAAL8AAAA/AACwQAAAAD8AAAA/AADQQAAAAD8AAAA/"}],"meshes":[{"primitives":[{"attributes":{"POSITION":1},"indices":0,"mode":4}]}],"nodes":[{"mesh":0}],"scenes":[{"nodes":[0]}]}}'::scene);查詢數據結果。
SELECT id, ST_AsText(data) FROM t_scene; ------------------------- 1 | {"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5126,"count":42,"max":[1.0,1.0,1.0],"min":[-1.0,-1.0,-1.0],"type":"VEC3"},{"bufferView":1,"componentType":5126,"count":42,"max":[1.0,1.0,1.0],"min":[-1.0,-1.0,-1.0],"type":"VEC3"},{"bufferView":2,"componentType":5126,"count":42,"max":[0.0],"min":[0.0],"type":"SCALAR"},{"bufferView":3,"componentType":5121,"count":240,"max":[41],"min":[0],"type":"SCALAR"}],"asset":{"generator":"Ganos Scene","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":504,"target":34962},{"buffer":0,"byteLength":504,"byteOffset":504,"target":34962},{"buffer":0,"byteLength":168,"byteOffset":1008,"target":34962},{"buffer":0,"byteLength":240,"byteOffset":1176,"target":34963}],"buffers":[{"byteLength":1416,"uri":"data:application/octet-stream;base64,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"}],"meshes":[{"primitives":[{"attributes":{"NORMAL":1,"POSITION":0,"_USER_1":2},"indices":3,"mode":4}]}],"nodes":[{"mesh":0}],"scenes":[{"nodes":[0]}]}} 2 | {"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5121,"count":36,"max":[7],"min":[0],"type":"SCALAR"},{"bufferView":1,"componentType":5126,"count":8,"max":[2.5,0.5,0.5],"min":[1.5,-0.5,-0.5],"type":"VEC3"}],"asset":{"generator":"ganos","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":36,"target":34963},{"buffer":0,"byteLength":96,"byteOffset":36,"target":34962}],"buffers":[{"byteLength":132,"uri":"data:application/octet-stream;base64,AgEAAQIDBAIAAgQGAQQABAEFBgUHBQYEAwYHBgMCBQMHAwUBAADAPwAAAL8AAAC/AAAgQAAAAL8AAAC/AADAPwAAAD8AAAC/AAAgQAAAAD8AAAC/AADAPwAAAL8AAAA/AAAgQAAAAL8AAAA/AADAPwAAAD8AAAA/AAAgQAAAAD8AAAA/"}],"meshes":[{"primitives":[{"attributes":{"POSITION":1},"indices":0,"mode":4}]}],"nodes":[{"mesh":0}],"scenes":[{"nodes":[0]}]}} 3 | {"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5121,"count":36,"max":[7],"min":[0],"type":"SCALAR"},{"bufferView":1,"componentType":5126,"count":8,"max":[6.5,0.5,0.5],"min":[5.5,-0.5,-0.5],"type":"VEC3"}],"asset":{"generator":"ganos","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":36,"target":34963},{"buffer":0,"byteLength":96,"byteOffset":36,"target":34962}],"buffers":[{"byteLength":132,"uri":"data:application/octet-stream;base64,AgEAAQIDBAIAAgQGAQQABAEFBgUHBQYEAwYHBgMCBQMHAwUBAACwQAAAAL8AAAC/AADQQAAAAL8AAAC/AACwQAAAAD8AAAC/AADQQAAAAD8AAAC/AACwQAAAAL8AAAA/AADQQAAAAL8AAAA/AACwQAAAAD8AAAA/AADQQAAAAD8AAAA/"}],"meshes":[{"primitives":[{"attributes":{"POSITION":1},"indices":0,"mode":4}]}],"nodes":[{"mesh":0}],"scenes":[{"nodes":[0]}]}}創建索引。
CREATE INDEX idx_t_scene ON t_scene USING GIST(data);空間查詢。
-- 與某個三維空間對象相交 SELECT id FROM t_scene WHERE ST_3DIntersects(data, ST_3DMakeCuboid(3, 3, 3)); ------------------------- 2 -- 包含在某個三維空間對象中 SELECT id FROM t_scene WHERE ST_Contains(ST_3DMakeCuboid(3, 3, 3), data); ------------------------- 1空間計算。
-- 與某個三維空間對象的intersection SELECT ST_asText(ST_Intersection(data, ST_3DMakeCuboid(3, 3, 3))) FROM t_scene WHERE id = 2; ------------------------- {"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5126,"count":6,"max":[1.5,0.5,0.5],"min":[1.5,-0.5,-0.5],"type":"VEC3"},{"bufferView":1,"componentType":5126,"count":6,"max":[-1.0,0.0,0.0],"min":[-1.0,0.0,0.0],"type":"VEC3"},{"bufferView":2,"componentType":5121,"count":6,"max":[5],"min":[0],"type":"SCALAR"}],"asset":{"generator":"ganos","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":72,"target":34962},{"buffer":0,"byteLength":72,"byteOffset":72,"target":34962},{"buffer":0,"byteLength":8,"byteOffset":144,"target":34963}],"buffers":[{"byteLength":152,"uri":"data:application/octet-stream;base64,AADAPwAAAL8AAAA/AADAPwAAAD8AAAC/AADAPwAAAL8AAAC/AADAPwAAAD8AAAC/AADAPwAAAL8AAAA/AADAPwAAAD8AAAA/AACAvwAAAAAAAAAAAACAvwAAAAAAAAAAAACAvwAAAAAAAAAAAACAvwAAAAAAAAAAAACAvwAAAAAAAAAAAACAvwAAAAAAAAAAAAECAwQFAAA="}],"meshes":[{"primitives":[{"attributes":{"NORMAL":1,"POSITION":0},"indices":2,"mode":4}]}],"nodes":[{"mesh":0}],"scenes":[{"nodes":[0]}]}} -- 多個gltf類型的scene對象合并成一個 SELECT ST_asText(ST_Combine(data)) FROM t_scene; ------------------------- {"type" : "gltf", "affine" : [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], "content" : {"accessors":[{"bufferView":0,"componentType":5126,"count":42,"max":[1.0,1.0,1.0],"min":[-1.0,-1.0,-1.0],"type":"VEC3"},{"bufferView":1,"componentType":5126,"count":42,"max":[1.0,1.0,1.0],"min":[-1.0,-1.0,-1.0],"type":"VEC3"},{"bufferView":2,"componentType":5126,"count":42,"max":[0.0],"min":[0.0],"type":"SCALAR"},{"bufferView":3,"componentType":5121,"count":240,"max":[41],"min":[0],"type":"SCALAR"},{"bufferView":4,"componentType":5121,"count":36,"max":[7],"min":[0],"type":"SCALAR"},{"bufferView":5,"componentType":5126,"count":8,"max":[2.5,0.5,0.5],"min":[1.5,-0.5,-0.5],"type":"VEC3"},{"bufferView":6,"componentType":5121,"count":36,"max":[7],"min":[0],"type":"SCALAR"},{"bufferView":7,"componentType":5126,"count":8,"max":[6.5,0.5,0.5],"min":[5.5,-0.5,-0.5],"type":"VEC3"}],"asset":{"generator":"Ganos Scene","version":"2.0"},"bufferViews":[{"buffer":0,"byteLength":504,"target":34962},{"buffer":0,"byteLength":504,"byteOffset":504,"target":34962},{"buffer":0,"byteLength":168,"byteOffset":1008,"target":34962},{"buffer":0,"byteLength":240,"byteOffset":1176,"target":34963},{"buffer":0,"byteLength":36,"byteOffset":1416,"target":34963},{"buffer":0,"byteLength":96,"byteOffset":1452,"target":34962},{"buffer":0,"byteLength":36,"byteOffset":1548,"target":34963},{"buffer":0,"byteLength":96,"byteOffset":1584,"target":34962}],"buffers":[{"byteLength":1680,"uri":"data:application/octet-stream;base64,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"}],"meshes":[{"primitives":[{"attributes":{"NORMAL":1,"POSITION":0,"_USER_1":2},"indices":3,"mode":4}]},{"primitives":[{"attributes":{"POSITION":5},"indices":4,"mode":4}]},{"primitives":[{"attributes":{"POSITION":7},"indices":6,"mode":4}]}],"nodes":[{"mesh":0},{"mesh":1},{"mesh":2}],"scenes":[{"nodes":[0]},{"nodes":[1]},{"nodes":[2]}]}}刪除擴展（可選）。
DROP EXTENSION Ganos_Scene CASCADE;
SQL參考
詳細SQL手冊請參見Scene SQL參考。
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