Building Vectorization

Tools

Arttu Soininen

Plane list

• Direction group letter
• Boundary color
• Slope angle
• Number of points matching plane
• Average mismatch (mm) from point to raw plane
• Average mismatch (mm) from point to adjusted

plane

Plane direction

• Each plane has a base direction

– direction group has a common base direction

• Base direction affects:

– surface equation -- aligns normal vector
– boundary lines -- aligned if

rectangle/rectangular

• Direction vector is computed:

– from normal vector for sloped planes -- accurate
– from point cloud for flat planes -- less accurate

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Identifying a plane

• Mouse click identifies a plane:

– inside which the mouse is
– closest to the viewer if multiple

• Use tentative on boundary

element to identify a plane behind
another

• Tools which accept 1-n planes:

– click inside a plane to add
– reset to reject the last one
– click outside all planes to complete

Aerial fill

• Before applying model

– no gaps between planes
– lower planes may extend inside higher

planes

Need to fix

Workflow order

• Reach correct number of planes
• Fix base directions
• Assign symmetry
• Set boundary types

Modify boundary shapes
Auto Align boundaries

• Apply model

Find Detail Planes

• Searches for additional planes

among points

• More eager to accept small planes
• Use if you see small, undetected

parts

Add Building Plane

• Add building plane by:

– placing boundary manually
– using a selected existing element

• Equation can come from:

– free points inside boundary
– boundary

• Use when:

– application has not found correct planes
– alternative vectorization methods have

been used methods

Mirror Building Plane

• Create new plane as mirror image of

another

• Use when missing plane lacks points

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Merge Building Planes

• Merge two planes into one

– check first that equations are close

• Use when you want to:

– simplify by combining two

neighbouring planes

– merge two disjoint parts

Delete Building Plane

• Delete a building planes
• Laser points become ‘Free points’

Create Direction Group

• Assign 1-n planes to a new

direction group

• Base direction can be:

– line given by two points
– base direction of first plane
– average of assigned planes

Add Plane To Group

• Add plane(s) to an existing

direction group

• First mouse click identifies group
• Consecutive clicks identify planes

to add

Assign Plane Block

• Assign joint geometry to 1 - 4 planes
• Not implemented yet

Assign Plane Symmetry

• Assign symmetry between 2-n planes
• Angle

– planes have the same slope angle
– useful if plane has a small number of hits

• Equation

– planes have the same equation
– useful with small planes which have a

weak plane equation on their own

Adjust Building Plane

• Adjust a plane equation to match

one, two or three given points

• Not implemented yet

Set Boundary Type

• Set boundary type of a plane

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Rectangle has four 90 degree corners

–

Rectangular has 4-n corners, all 90 degrees

–

Polygon is a free shape

Rectangle

Rectangular

Polygon

Auto Align Boundaries

• Automatically aligns boundary lines

with

– intersection lines
– each other

– best line position from images (not

implemented)

Align Boundary Segment

• Align one boundary segment to another
• Needed when building has multiple

base directions

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Place Boundary Shape

• Place boundary of a plane manually
• Use when too much editing in

automatic boundary

• Rectangle/rectangular type:

– segment directions constrained by base

direction

• Polygon type:

– Option to align segments close to base

direction

Modify Boundary Shape

• Move a vertex or a segment
• Rectangular boundaries stay rectangular

– linear vertices removed at the end

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Cut Boundary Corner

• Cut a piece off from a corner
• Add a piece to a corner

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Cut Boundary Segment

• Cut a piece off from a segment
• Add a piece to a segment

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Delete Boundary Vertex

• Removes a vertex from a boundary
• Mainly for polygon type boundaries

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