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ContextCapture - Workshop

Presenter: Marc Rietman, Application Engineer, Bentley Systems

Bentley Systems, Incorporated 685 Stockton Drive Exton, PA 19341 www.bentley.com

WORKSHOP ContextCapture

Copyright Notice Copyright ©2016, Bentley Systems, Incorporated. All Rights Reserved.

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WORKSHOP ContextCapture Table of Contents TABLE OF CONTENTS ................................................................................................. 3 1.0 INTRODUCTION ................................................................................................ 4 SESSION DESCRIPTION ........................................................................................................ 4 LEARNING OBJECTIVES ....................................................................................................... 4

2.0

CREATING PROJECT AND IMPORT PHOTOS .......................................... 5 OVERVIEW .......................................................................................................................... 5

3.0

USING CONTROL POINTS. .......................................................................... 14 OVERVIEW ........................................................................................................................ 14

4.0

RECONSTRUCTION AND PRODUCTION ................................................. 27 OVERVIEW ........................................................................................................................ 27

5.0

RETOUCHING ................................................................................................... 39 OVERVIEW ........................................................................................................................ 39

6.0

MIXING AERIAL AND STREET IMAGERY ................................................ 54 OVERVIEW ........................................................................................................................ 54

7.0

USING 3D MESH IN BENTLEY DESKTOP PRODUCTS ....................... 56 OVERVIEW ........................................................................................................................ 56

8.0

USING 3D MESH ON A MOBILE DEVICE ............................................... 71 OVERVIEW ........................................................................................................................ 71

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WORKSHOP ContextCapture 1.0

Introduction

In this workshop we will show the use of ContextCapture. With ContextCapture, you can quickly produce even the most challenging 3D models of existing conditions for infrastructure projects of all types, derived from simple photographs. Without the need for expensive, specialized equipment, you can quickly create and use these highly detailed 3D reality models to provide precise real-world context for design, construction, and operations decisions for use throughout the lifecycle of projects. Develop precise reality meshes, affordably, with less investment of time and resources in specialized acquisition devices and associated training. You can easily produce 3D models using up to 100 gigapixels of photos taken with an ordinary camera, resulting in fine details, sharp edges, and geometric accuracy. You will have the confidence to reliably deliver any highly detailed model in less time without risks of software limitations. You can automate the production of models of virtually any size and/or precision, much faster than previously possible. Access and share these rich reality models of existing conditions for use in any CAD or GIS workflow. You can easily and consistently share information, consumable and accessible, on desktop and mobile devices, in many formats, including native use within MicroStation. - See more at: https://www.bentley.com/en/products/product-line/reality-modelingsoftware/

Session Description In this workshop users will learn how to create photos into 3D models and use these models in Bentley Desktop products.

Learning Objectives After this workshop you will be able to:      

Import Photos in ContextCapture Import Coordinates Use Control Points Retouch models with Bentley Descartes CONNECT Edition Create productions from different types Use 3MX in MicroStation CONNECT Edition

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WORKSHOP ContextCapture 2.0

Creating Project and import photos

Overview Use ContextCapture Master to create a project. The Project folder will be created. Photos are imported to the project. If the photos are georeferenced the coordinates can be stored in the header of the photo

Or in a separated text file (photolog). Both types can be imported. If stored in the photo itself there is no extra action required otherwise the coordinates can be imported.

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Exercise: Create a Project 1. Start ContextCapture (center) Master 2. Select New Project. Use as Project Name: Workshop_1. Project Location: Browse to D:\Data\ContextCapture\Project\Workshop\. Disable Create Empty Block

3. Project Workshop_1 is created.

There are different options from the import from the photos possible:  Add Photos by selecting the photos manual or select a directory with photos.  Create an Excel file with Import settings.

Note

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In the installation directory from ContextCapture are 2 excel files, a template and a example. "C:\Program Files\Bentley\ContextCapture Center\doc\BlockImportTemplate.xls" and "C:\Program Files\Bentley\ContextCapture Center\doc\BlockImportSample.xls"

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Exercise: Import photos by using Excel import. 1. Open Windows Explorer and browse to D:\data\ContextCapture\Project\Workshop 2. Open BlockImport_Workshop_1.XLS and explore the different Tabs 3. Continue in ContextCapture Master project Workshop_1. 4. Select Import blocks

5. Browse to D:\data\ContextCapture\Project\Workshop \BlockImport_Workshop_1.xls 6. Open the imported block. 7. Click on Photos tab, Open the Photo Group and select the photos.

8. Open 3D View and explore the flight path.

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Exercise: Import photos by selecting photos. 1. Open ContextCapture Master and create a new project Workshop_2 in the same directory as the previous project. Enable Create an empty block

2. Open the Block and select tab Photos 3. Select Add Photos > Photo selection and browse to D:\data\ContextCapture\Project\Workshop\Photos\Photos and select all the photos.

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4. Notice that 3D View is grayed out and that the coordinates for each photo is empty.

This photos are not georeferenced but there are coordinates for each photo available. These coordinates can be imported in the ContextCapture project.

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Exercise: Import Coordinates from Text file. 1. Continue in ContextCapture Center project Workshop_2. 2. Select Import Posistions.

and browse to D:/Data/ContextCapture/Projects/Workshop/Import_Coordinates.txt

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Select Spatial Reference system database and search for EPSG:2193 Select and accept

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WORKSHOP ContextCapture Select for each Column the role

Notice that 3D View is now available and Coordinates filled.

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WORKSHOP ContextCapture 3.0

Using Control points.

Overview When there are no coordinates are available or if precision should be enhanced it is possible to use control points.

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Exercise: Create a new project and import photos. 1. Open ContextCapture Master and create a new project Workshop_3 in the same directory as the previous project. Enable Create an empty block 2. Import Photos from D:\Data\ContextCapture\Projects\Workshop\Photos_3 3. Notice that the photos are not georeferenced.

After the photos are added the control points can be added.

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Exercise: Create a new project and import photos. 1. Continue in ContextCapture Master. 2. Open Control points tab and select Edit Control Points

4. Add Spatial Reference System select Spatial Reference System Database

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5. Search for EPSG: 3460, select the result and select Override vertical coordinate System.

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WORKSHOP ContextCapture 6. Select EGM: 96

7. Select File > Import and Browse to D:\Data\ContextCapture\Projects\Workshop\Controlpoints.txt

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WORKSHOP ContextCapture 8. Control Points are now imported

The control points can now be added. There are many control points available. By adding first a couple points (around the project), run then the AT with a downsampeling form e.g. 30% the roughly position from the photos will created. Afterwards add the other control points, remove the downsampeling and run the AT again for a better results

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Exercise: Adding Control points. 1. Open windows explorer and open D:\Data\ContextCapture\Projects\Workshop\Controlpoints.pdf. Poisition from Control points are visible on the photos 2. Continue in Context Capture Master and open Control Points tab. 3. Select PC4 (1) , select photo 9700 (2) zoom to the control point and select the point (Shift + Left Mouse).

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4. Do this for the control points below. Control Point PC4 PC6 PC17 PC26A

Photo Number 9700, 9701, 9703 9768, 9769, 9770 9730, 9727, 9626, 9627 9600, 9601, 9602

5. File > Save and dismiss the Control Points Menu. 6. Select Photo Tab and Select Set downsampeling at 30%

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The Areotriangulation (AT) can now be started.

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Exercise: Aerotriangulation. 1. Start ContextCapture Engine (Desktop icon) 2. Continue in ContextCapture Master project Workshop_3. 3. Select Block and Submit Aerotriangulation

4. Give name

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Submit 5. AT is running now (around 6 minutes)

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Exercise: Adding more points. 1. Continue in Context Capture Master and open Control Points tab. 2. Select a control point (e.g. PC13) and Display Photos: That might view point

3. The roughly position from the control point will be display with a green circle.

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WORKSHOP ContextCapture 4. How more control points are selected how better this position will be. 5. Add some points (minimum 3 photos for each control point.) For e.g 9, 15, 19, 22 and 25 6. File > Save and run the AT again (keep down sampeling at 30%.) Notice that the position from the predicted location from the control points is now much better

Note

Select Block > Export > Export to KML and open this file in Google Earth to check if the coordinate system is correct.

Positioning constraints Positioning constraints are position/orientation/scale priors based on user tie points. They are used to perform a rigid registration of the block during aerotriangulation. You can set the origin and/or the scale and/or the orientation (either on axis or a plane). Positioning constraints are used only when using the mode "Use positioning constraints on user tie points" during aerotriangulation.

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Adding manual tie points. 1. Continue in Context Capture Master and open Tie points tab and select Edit user tie points.

2. Select Coordinate system and Add point.

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3. Create a point and select a common point in minimum 2 photos.

File > Save and close 4. Select Add scale constraint.

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5. Select the 2 tie points and give the measured distance between both tie points.

6. The AT can now be recalculated. When running the AT select use position constraints on user tie points

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WORKSHOP ContextCapture 4.0

Reconstruction and Production

Overview After the AT is calculated is it possible to create the export formats Export is possible to different formats:     

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3D Mesh – 3MX, OBJ, Autodesk FBX, Collada (DAE), ESRI i3s, Cesium 3D tiles Point Cloud – Las, Pod Orthophoto – TIFF/GeoTIFF, JPEG, KML Super-overlay DSM - TIFF/GeoTIFF, ESRI ASCII raster/ASC, XYZ 3D mesh for retouching

Exercise: Create a Reconstruction and set tilling. 1. Start ContextCapture (center) Master 2. Select New Project. Use as Project Name: Workshop_4. Project Location: Browse to D:\Data\ContextCapture\Project\Workshop\. 3. Disable Create Empty Block 4. Select Import Bloks and browse to D:\Data\ContextCapture\Projects\Workshop\Block_Import\Block_1export.xml

5. The block will be imported. Notice that AT is already created. 6. Select the block and Select New Reconstruction

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7. The Reconstruction is now created.

8. The expected maximum RAM usage is too high. Tilling is needed 9. Select Spatial framework tab.

10. Because of the limited time we change the area to a small part.

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WORKSHOP ContextCapture 11.Select Region of interest and select the side and move them till the area is similar as in the picture below or use the Bounding box..

12. The Expand RAM usage is now 2.6 GB . Normally is this enough for processing. Max value is half of the RAM from the pc. For this workshop we will set Tilling. 13.Select Mode: Regular planer grid

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Note

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Change the Tile Size to set to half off the RAM from the pc.

Exercise: Creating 3D Meshes. 1. Continue in ContextCenter Master in the project Workshop_4 2. Select Reconstruction_1 > Submit new production

3. New Production will be created. Give name

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Submit 4. Make sure that the ContextCapture engine is still running. 5. Production is now started. (14 Min)

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Note

During the process the Viewer will be available and the data can be viewed.

After the 3D mesh is created it is possible to export the other formats.

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Exercise: Creating 3D Pointcloud 1. Continue in ContextCenter Master in the project Workshop_4 2. Select Reconstruction_1 > Submit new production

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3. New Production will be created. Give name

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Submit 4. Make sure that the ContextCapture engine is still running. 5. The production is now running. (3 minutes)

Note

Because off the tiling different POD files are created. Use the free Pointools POD creator to merge these files to one file.

Optional: Do the same for the Orthophoto

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WORKSHOP ContextCapture 5.0

Retouching

Overview In some cases, the output 3D models may include misconstructions that need to be fixed (unseen areas, reflective parts, water area...). Output 3D models may be fixed in a third party software at the end of, or during the ContextCapture process by modifying the reconstruction reference 3D model. Retouching the ContextCapture reconstruction reference 3D model allows to benefit from ContextCapture automatic texturing and/or output formats.

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Exercise: Export for Retouching. 1. Continue in ContextCenter Master in the project Workshop_4 2. Select Reconstruction_1 > Submit new production

3. New Production will be created. Give name

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Select Format: OBJ and disable Include texture maps

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Select reference system

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WORKSHOP ContextCapture Select tile(s) to retouch. Use Select from 3D view

Select the tile(s) to retouch.

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Submit 4. Make sure that the ContextCapture engine is still running. 5. Obj files are now created.

Note

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Make a backup from the obj file before editing.

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WORKSHOP ContextCapture We are using Bentley Descartes CONNECT Edition to retouch the data

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Exercise: Create a new dgn and import the mesh.. 1. Open Bentley Descartes CONNECT Edition (desktop icon). 2. Select New File

3. Select directory D:\Data\ContextCapture\Project\Workshop (1) , as Seed file use 3D Metric Design.dgn, use Browse (2) to select the seed file. Give a name for the design file (3)

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Select Save 4. The dgn file is now created and opened.

Close View 2 and 3 and maximize view 1 5. Open the workflow Reality Modeling and the tab Retouch.

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6. Select Import OBJ and browse to D:\Data\ContextCapture\Projects\Workshop\Workshop_4\Productions\Ret ouch\Data\Tile_+001_+001 and select the obj file.

7. Select Fit View to show the data

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WORKSHOP ContextCapture The mesh is imported now in the dgn and can be edited. Let’s remove a building from the mesh.

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Exercise: Editing the mesh. 1. Continue in Bentley Descarted CONNECT Edition. 2. Select the mesh (1) and start the drop element command (2).

3. Drop the mesh by accept.

4. Use the zoom buttons to rotate the building that need to be removed.

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5. Select Delete Mesh Facet in Block mode

6. Select the mesh and draw a block and accept again.

7. Repeat this command if needed. 8. Close the mesh by selecting Close Mesh Voids

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Select and accept the mesh.

9. Now the mesh is edited it can be exported back to Obj. Select Export to OBJ and browse to D:\Data\ContextCapture\Projects\Workshop\Workshop_4\Productions\Ret ouch\Data\Tile_+001_+001 and select the OBJ file (except overwrite)

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10.The OBJ file is now exported. Close Bentley Descartes Connect Edition.

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Exercise: Update 3D Mesh with retouched OBJ file. 1. Continue in ContextCenter Master in the project Workshop_4 2. Select Reconstruction_1 > Reference 3D Model

3. Select Import retouches (1) , select Add retouched tiles directory (2) and browse to the directory with the retouched OBJ file. (D:\Data\ContextCapture\Projects\Workshop\Workshop_4\Productions\Re touch\Data\Tile_+001_+001\)

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4. Select Import retouches

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5. Select Production_1(3D Mesh) and select Submit update

6. Make sure that the ContextCapture engine is still running 7. 3D mesh will be updated. (only the changed tile is processed)

8. Open Acute3D view and see that the building is flatten from the 3D mesh. Optional: run the other productions.

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WORKSHOP ContextCapture 6.0

Mixing Aerial and Street Imagery

Overview The accuracy and the details of a ContextCapture model (former Smart3DCapture) are tightly linked to the resolution of the input images. The best way to get a more detailed 3D-mesh is including closer range imagery in the process. Aerotriangulation :  Process both street and aerial aerotriangulations separately. Use the control points to geo-reference your Aerial block (if available).  Do a first production of your aerial model. In this model, select arbitrary points that will be visible in the street imagery in order to use them as control points.  Proceed to a rigid registration of your street block using the control points defined previously  Your street block is now geo-referenced.  Do a first production of your street block. In the model, select points that will be visible from the aerial pictures, in order to create control points.  Integrated the previously defined control points in your aerial project and redo an aerotriangulation using "use control points for adjustment"  After this steps, the relative referencing between the two blocks will be optimal. Mixing the two projects :  Export your two blocks using the XML export tool (aerial-level alone and street-level alone). You have to select the same export spatial reference system and rotation format.  check the option "include tie points"  Here comes the tricky part : you have to mix both of the XML files.  Tip : if you are using notepad++ to edit the xml files, change the "XML" extension to "txt". It will work faster.  In this tutorial we will now call the two XML files : XML_A and XML_B  Choose one of the xml files as reference : here, XML_A ( we advise you to choose the one with the most photogroups). Before any modification, save a backup.  In XML_B change the name of the photogroup(s) if it matches one of the photogroups of XML_A  In XML_B change the photos to be sure it doesn't match any of XML_A photos . To do so, you can use notepad++ and use the "replace" function to replace "" by "1000" for example ( i.e. "1" will be changed into "10001").  Do the same thing with the : replace "" by "1000"  Copy all the photogroups from XML_B to XML_A (everything that is between and (both tags excluded)).

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WORKSHOP ContextCapture        

Now your XML_A contains all the photogroups and all the photos have different Ids. Copy all the tie points from XML_B to XML_A (everything that is between and (both tags excluded). Be sure to keep the XML tree consistent during all those steps. Now your XML_A contains all the tie points with the right PhotoIds. You can now import the resulting XML file in S3C Check your project to see if everything has loaded properly. You should see in the 3D view all the tie points from both aerial and street projects. Future versions of Smart3DCapture will ease the mixing of the two XMLs. Acute3D S.A.S. WTC 2 120 route des Macarons MMacaronsDolines 06560 Valbonne Sophia Antipolis France www.acute3d.com

Reconstruction :  The tricky thing for the reconstruction is the tiling : because you have different resolutions you will have to mix different tile size.  To be able to do so, you have to use the same spatial reference system for tiling and use the same tiling advanced options (same origin). The tile size of the larger tiles has to be a multiple of the small tile size. Thereby the junction between small and large tiles will be flawless.

 

Produce the large tiles where there is only aerial data and produce the small tiles where there is both aerial and street data. You may have to produce some small tile around the street level area even if there is no street data. Once everything is produced copy the small tiles in the large tiles production directory and use the scene composer to add all those tiles in the same S3C.

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Using 3D Mesh in Bentley Desktop products

Overview It is possible to use the 3D Mesh (3MX) in Bentley desktop products. 3MX is supported in the latest V8i version from MicroStation and all related products like Bentley Map, Bentley Descartes. In the CONNECT editions from MicroStation and Descartes is extra functionality available.

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Exercise: Use the 3MX in Descartes CONNECT Edition (also available in MicroStation CONNECT Edition). 1. Start Descartes CONNECT Edition and Browse to D:\Data\ContextCapture\Projects\Workshop\3DMeshes.dgn 2. Select a element and open Properties

3. Open tab Buildings and notice the attributes.

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4. Open Attach tab (workflow Drawing) and Select Attach Reality Mesh

5. Browse to D:\Data\ContextCapture\Projects\Workshop\Workshop_4\Productions\Pro duction_1\Scene\Production_1.3mx and enable Attach and Apply Geographic Coordinate System

6. Mesh is now attached

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Exercise: Using the attributes from the Buildings 1. Continue in Descartes CONNECT Edition in the file 3DMeshes.dgn 2. Open Reality Mesh Attachments

3. Select Attach Reality Model Classifier

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Type: Level Name: Building Select an element on the Building layer and Accept the selection. (2x Accept) 4. Dismiss Reality Mesh Attachments menu 5. Turn the layer Building off.

6. Select Select Classifier and hoover over the buildings. See the buildings Highlighted

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7. Try out the options Clip and Mask. From the Classifier menu Inside and Outside. Set both values on Off

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Exercise: Search on the attributes from the Buildings 1. Continue in Descartes CONNECT Edition in the file 3DMeshes.dgn 2. Select Explorer

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4. Select Values as below

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WORKSHOP ContextCapture Press Add to Search 5. Open the result in the Explorer and select Zoom

6. Building 1 is selected and zoomed in

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Exercise: Create a Terrain Model from 3MX 1. Continue in Descartes CONNECT Edition and open the file Terrain.dgn 2. Attach "D:\Data\ContextCapture\Projects\Workshop\Orlando_3MX\Scene\Orland o.3mx" and enable Attach and Apply Geographic Coordinate System. 3. Select Reality Mesh > Clip and select the element in the design file

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4. The mesh is now clipped.

5. Turn the Level Clip off. Level Display > Make Level Default active, turn level Clip off.

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6. Select Ground Extraction from the workflow Reality Modeling.

7. Set the settings. Toggle Classified Point Cloud on

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8. Select the Mesh and save the tin, stm and pod file to D:\Data\ContextCapture\Projects\Workshop\Terrain 9. Turn the reality Mesh off. 10.Use Scalable Terrain Model and pointcloud to view the Point cloud and Terrain Model.

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Exercise: Create sections 1. Continue in Descartes CONNECT Edition in the file Terrain.dgn 2. Open Section Tools. (Workflow Reality Modeling)

3. Set the settings.

4. Select the mesh and draw a line over the mesh in view 1

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And set the width

5. View 2 is opened. Arrange the views. 6. Open Sections tab in Reality Model Presentation.

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7. Use the Move Forward buttons to walk through the model. See view 2 getting updated.

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Exercise: Create a solar exposure 1. Continue in Descartes CONNECT Edition in the file Terrain.dgn 2. Select Solar Exposure.

3. Save the dgn.

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Using 3D Mesh on a mobile device

Overview It is possible to use the 3D Mesh (3MX) on a mobile device like the iPAD.

1. First thing you will need to do is install iFileExplorer onto your iPad https://itunes.apple.com/us/app/ifileexplorer-pro-built-in/id542138510?mt=8

2. Then once you have iFileExplorer installed connect your iPad to a Mac or PC with iTunes running 3. Click the iPad button in iTunes, colored blue below

4. Then click Apps on the sidebar

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5. Then scroll down the page on the Right using the side bar highlighted in Yellow

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6. Then click the iFileExplorer App in the Middle Blue Box 7. Drag and Drop the Root Folder of a 3MX Project (inside this Folder there will be 2 Subfolders called App and Scene) to iTunes and Drop it where you see Orlando above. 8. To open the 3MX project on the iPad open iFileExplorer and go to the App folder and open the index.html file and enjoy.

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