The document discusses the integration of Building Information Modeling (BIM) and Geographic Information Systems (GIS) using the mago3D platform, which facilitates the visualization of massive 3D data on web browsers. It introduces the F4D format, which optimizes BIM data for web services by reducing size and enhancing rendering performance through techniques like culling. The document emphasizes the need for open-source solutions to improve accessibility and interoperability of complex 3D models in facility management.

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Meeting
Sponsors
BIM/GIS Integration:
A Practical Approach in Real Cases
106th OGC Technical Committee
Orléans, France
Sanghee Shin, Hakjoon Kim
Gaia3D, Inc.
21 March 2018
Copyright © 2018 Open Geospatial Consortium

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Agenda
∙ Background and introduction
∙ Key points of what we’ve done so far
− F4D, a newly devised format for 3D web service
− What are in F4D
− Implemented results
Objective: Share experiences in handling very large size and
high precision 3D data on web environment.
Copyright © 2018 Open Geospatial Consortium

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Background

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Background

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Building Information Modeling (BIM)
is a digital representation of physical and
functional characteristics of a facility.
Background

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Background

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BIM/AEC data is quite big and complex!
 Hard to see and access BIM data without special software!
Background

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Technologies are closed and proprietary!
Source: http://artist-3d.com/free_3d_models/graphics- file-formats.php
3D formats are usually created with
professional CAD software
Many 3D formats are proprietary
with low inter-operability
 Hard to access proprietary technologies and formats!
Background

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Geospatial Context Matters!
 Need to manage facilities and processes in geospatial context!
Facility Management
GeoBIM Platform
Integration
Model
Background

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Open Source
Web/Mobile
GeoBIM
Access GeoBIM
Open Technology!
How to overcome these hurdles?
Background

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Introductions

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Introductions

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mago3D is a platform for …
Visualizing massive and complex 3D objects including BIM
on a web browser
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of BIM/AEC and 3D GIS in a single spaceSeamless integration of BIM/AEC and 3D GIS in a single space2
Web based collaborative issue/process management4
‘Digital Twin’ that can create parallel worlds in a virtual reality
with numerous IoT, sensor data
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Introductions

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2 Main Cores of mago3D…
F4D Converter mago3D.js
mago3D.js
3D GIS Engines
Cesium.js
WebWorldWind.js
API
API
service html
F4D Converter
F4D
.ifc
.3ds
.obj
.dae
F4D Converter converts 3D formats(IFC, 3DS, OBJ, DAE, JT)
to 3D internet service format F4D. It carries out data size
reducing and pre-processing for fast rendering.
JavaScript that expands existing WebGL Globe’s features to
support BIM and indoor space.
Introductions

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F4D is a format optimized for only web services of
BIM/AEC data
This is designed for :
- reducing size of data for network traffic.
- supporting pre-processed things for
rendering performance.
F4D

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How to reduce size : Model-Reference Concept
Model is 3D geometry info, while Reference is real instance of this model Model is 3D geometry info, while Reference is real instance of this model
What are in F4D

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Example of Model-Reference
With 4 geometric meshes - 4 models 23 objects are created. - 23 instances
Image source : www.vecteezy.com
What are in F4D

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5 key technique : Culling for performance enhancement
visibility index
An index describing which inner objects can be
seen from selected positions in AEC.
This index is used in occlusion culling in run-
time visualization of mago3D.
What are in F4D
top view inside a building

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5 key technique : Culling for performance enhancement
spatial index
An index describing which inner objects are in
cubes, spatial sub-divisions of AEC.
This index is used in frustum culling in run-
time visualization of mago3D.
What are in F4D
top view inside a building

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5 key technique : Culling for performance enhancement
1. When a camera position and
2. the viewing direction of it are setup,
3. mago3D does frustum culling on spatial
indices
4. and do occlusion culling on the result of the
frustum culling.
5. Finally mago3d finds targets to be rendered.
(intersection between two indices)
→ It possible to select targets to be
rendered without any complicated geometric
calculation in run-time.
What are in F4D
How to use both indices
top view inside a building

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5 key technique : Culling for performance enhancement
Do not render if not necessary.
before rotating a camera
around a target
during rotating after rotating
What are in F4D
Sample of frustum and occlusion culling

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5 key technique : Culling for performance enhancement
What are in F4D
In 2D, it’s not necessary to draw
detailed data during window is
moving.
window is movingbefore window moving
after window moving

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5 key technique : Culling for performance enhancement
What are in F4D
Similarly, it’s OK to drop small-sized triangles for
rendering performance during camera is moving.
But, how?
Should size comparison codes run in run-time?
Nope.

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Write geometry data with triangles sorted step-wisely like following
What are in F4D
Triangle Vertex
Index Array
V_1 V_2 V_n-1 V_n
with range index markers : {R1, … , Rm} (R1 <= … <= Rm)
with size thresholds : {S1, …, Sm} (S1 > … > Sm)
R1 ….. Rm
sizes of triangles in 1 ~ R1 - 1 >= S1
sizes of triangles in R1 ~ R2 - 1 >= S2
…
sizes of triangles in Rm-1 ~ Rm - 1 >= Sm
sizes of triangles in Rm ~ n < Sm
so that

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camera pauses camera is moving
And just tell graphic card through WebGL, ‘Render from here to there’.
Then you can drop all triangles out of range in run-time like following.
What are in F4D

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BIM Integration
Seamless integration of BIM and 3D GIS
on the same platform
scene from indoor to outdoor through windows Scene from outdoor to indoor through windows
Implemented results

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AEC Integration
Integration of large size AEC and 3D GIS
on a web browser
Implemented results

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Implemented results

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Key Features
• BIM/AEC and 3D GIS integration in a single space
• Web based – no need to install additional program
• Massive and complex 3D objects rendering
• Open source – Apache and AGPL license
• Supports industry standard formats(ifc, 3ds, dae, kml, gltf…)
• In-Browser 3D objects moving/rotation/heading adjustment
• Highly extensible architecture
In Summary

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http://www.mago3d.com

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Meeting
Sponsors
Thanks!
Sanghee Shin shshin@gaia3d.com
Hakjoon Kim hjkim@gaia3d.com
http://www.mago3d.com
Copyright © 2018 Open Geospatial Consortium