Transcript Class Summary

AB6069-V A Few Million Points: Scan to BIM
Beau Turner
Product Director
© 2012 Autodesk
Class Summary
Laser Scanning and Point Clouds are a hot topic and in this session we
will be covering what Laser Scanning is, show the full working details.
Moving right into what point clouds provide to you, managing the
expectations and following the data workflow from capture (start) to use
(finish) and where you can take advantage of using the Scan to BIM
product with Autodesk Revit to streamline the workflow, literally from Scan
to BIM. This will be a full overview taking you through the process with
time to get your questions answered in one location.
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Learning Objectives
At the end of this class, you will be able to:
 Learn first hand what the cutting edge of scanning is doing (and how a
scanner works)
 Identify where laser scanning may be a fit for your project
 Understand & manage expectations when working with Point Cloud data
 Leverage tips on what to do, what to avoid, where potential issues may
arise and how the latest techniques can benefit you
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Module 1: What is a point cloud
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Module 1: What is a point cloud
A point cloud is a set of vertices in a three-dimensional
coordinate system.
These vertices are usually defined by X, Y & Z
coordinates, and typically are intended to be
representative of the external surface of an object.
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Module 1: What is a point cloud
Point clouds are most often created by a 3d scanner.
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Module 2: Capturing Data
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Module 2: Capturing Data
These devices measure in an automatic way a large number of points on
the surface of an object, and typically output a point cloud as a data file.
The point cloud represents the set of points that the device has measured.
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Module 2: Capturing Data
Scanners need to
have visible targets in
order to be able to
assemble different
scans into one unified
point cloud.
Targets appear in
more than one scan,
so that the scans can
be stitched and
registered together.
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Things to Consider
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Scanning: Up-Front Requirements
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What are you trying to get out of the scanning project?
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Scanning: Up-Front Requirements
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Number of Points
• Modern scanners are able to collect an overwhelming number of points
• What amount(s) are useful/necessary for the modeling process?
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Origin/Orientation
Meaningful location on building/property?
GIS-based / State Plane coordinates?
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Scanning: Up-Front Requirements
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What’s the nature of the building?
Square Footage
General Shape/Features (box? Gehry-esque?)
Open floor plan? Closed Rooms?
Conditions (empty, occupied, access/permission to spaces, roof, etc)?
Old? New?
Materials? Brick, Metal Wall Panel, other?
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Scanning: Up-Front Requirements
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What kind of modeling is planned?
Basic walls/doors/windows/openings?
Piping/Ductwork/Structural Elements
Stairs/Railings?
Ornamental Details (crown molding, custom casework, etc)
What kind of modeling accuracy am I attempting to get?
What defines modeling accuracy for you?
For out-of-plumb walls:
• I will do profile (90 deg) walls, and test that deviation is “not too bad”
• I will create mass walls to model exactly
Content: creation of instance-based doors, etc?
Documentation of discrepancies
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Scanning: Up-Front Requirements
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Planning to capture MEP data?
• Mechanical Rooms?
• Above the ceiling? (you’ve just doubled your square footage)
• Ease of access / removing tiles / etc?
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Hardware / Logistics
• How are point clouds being stored,
delivered, archived?
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Module 3: I Have Point Clouds Now What?
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Module 3: I Have Point Clouds Now What?
You can use the point clouds to create a Building Information Model
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Module 4: Getting Started in Revit
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Module 5: Get Started with Scan to BIM
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Module 6: Tips and Techniques
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Tips and Techniques
Segment
the model and the point cloud
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Levels
• Areas of the Building
• Key Sections
Manage the point-count
 How Much Detail?
 Balance Distance with Detail
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Tips and Techniques
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Preparation
Content Styles/Creation
Finishes / Materials
Modeling Process
Establish Building Location/Orientation
Organize Revit Models Early: Levels by Sectioning
Use Reference Planes
Walls -> Openings -> Floors -> Roof
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