## Move points to a '3D grid'

### Move points to a '3D grid'

Hi,

I am trying to write a script for cleaning up geometery created from another program (IES VE). Essentially what I want to achieve is to move each vertex so it sits on a '3D grid'. I believe this could be achieved by applying a rounding function to the X,Y and Z coordinates of each point.

The attached image hopefully illustrates what I am trying to achieve. Ideally the degree of rounding would be a user input variable.

Any help on this would be greatly appreciated.

Ross
0

rossthompson

### Re: Move points to a '3D grid'

You can use the scale tool: begin to scale then type 400mm;400mm;400mm + enter.

Note that the separator may be "," for you .
0
" c'est curieux chez les marins ce besoin de faire des phrases "

gilles
Top SketchUcator

### Re: Move points to a '3D grid'

gilles wrote:You can use the scale tool:

rossthompson wrote:I am trying to write a script
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author

### Re: Move points to a '3D grid'

This is a nice idea - I might implement such a feature in Vertex Tools.

Of the top of my head, something like this:

pt = Geom::Point3d.new( 3.976879, 3.970209, 1.002568 )
grid_pt = pt.to_a.map { |n| n.round() }
v = pt.vector_to( grid_pt )

You can do something like that - iterate the vertices of a mesh, for each vertex find the nearest grid position to the vertex, collect the vertex and adjustment vector to each their array and use Entities.transform_by_vectors https://developers.google.com/sketchup/ ... by_vectors

Note that this simple example rounded to nearest whole number. Modifications is needed to account for grids fitted to decimal precision.
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author

### Re: Move points to a '3D grid'

Actually, that example will round to nearest inch - which is SketchUp's internal unit...
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author

### Re: Move points to a '3D grid'

Code: Select all
pt = Geom::Point3d.new( 3.976879.m, 3.760209.m, 1.002568.)
tolerance = 0.25.m
grid_pt
= pt.to_a.map { |n|
b = ( n / tolerance ).to_i * tolerance
r
= n % tolerance

(> tolerance / 2) ? b + tolerance : b
}
grid_pt = Geom::Point3d.new( *grid_pt )

puts "Original: #{pt}"
puts "Tolerance: #{tolerance}"
puts "Grid Point: #{grid_pt}"

Output:
Original: (3976,879mm, 3760,209mm, 1002,568mm)
Tolerance: 250mm
Grid Point: (4000mm, 3750mm, 1000mm)
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author

### Re: Move points to a '3D grid'

Test module - adjust the vertices in the active context to grid.

Code: Select all
module GridSnap

def self
.round_pointpointtolerance )

grid_pt point.to_a.map { |n|

= ( tolerance ).to_i tolerance
r
tolerance

(tolerance 2) ? tolerance b

}

Geom::Point3d.new( *grid_pt )

end

def self
.test_it
pt
Geom::Point3d.new( 3.976879.m3.760209.m1.002568.)

tolerance 0.25.m
grid_pt
self.round_pointpttolerance )

puts "Original: #{pt}"

puts "Tolerance: #{tolerance}"

puts "Grid Point: #{grid_pt}"

end

def self

model Sketchup.active_model
vertices
= []

# Collect vertices.

for e in model.active_entities
vertices
<< e.vertices if e.is_a?( Sketchup::Edge )

end
vertices
.flatten!

vertices.uniq!

vectors = []

entities = []
for
vertex in vertices
pt
vertex.position
grid_pt
self.round_pointpttolerance )

vector pt.vector_togrid_pt )

next unless vector.valid?

entities << vertex
vectors
<< vector
end

# Apply transformations

model.active_entities.transform_by_vectorsentitiesvectors )

end

end
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author

### Re: Move points to a '3D grid'

... from concept to module in under a hour.
0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

Could this then be a tiny step towards a poly-reducer?
As the vertices are 'rationalized' onto a 'grid' some faces could become coplanar and therefore the superfluous shared edges could be removed.
The fineness/coarseness of this 'grid' removes less/more 'detailing'...
0
TIG

TIG
Global Moderator

### Re: Move points to a '3D grid'

Cubificator?

I was thinking it might be usable to repair troublesome model imported from CAD drawings. Occasionally I run into models where splitting a face with an edge results in duplicate faces. I suspect its due to some precision errors. Maybe if the vertices where adjusted to fit to a finely grained 3D grid the troubles would go away... ?
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author

### Re: Move points to a '3D grid'

ThomThom thanks so much for your support! I have had a go at running your test module. My understanding is that it should shift the points in the active selection to a 0.25m grid as specified in the code.

However I am having problems running the module. I have attempted to add it to the tools menu as below, but I am not 100% sure how to 'call' the routine. Appologies if I'm being an idiot - I am new to ruby scripting!

Code: Select all
module GridSnap

def self.round_point( point, tolerance )
grid_pt = point.to_a.map { |n|
b = ( n / tolerance ).to_i * tolerance
r = n % tolerance
(r > tolerance / 2) ? b + tolerance : b
}
Geom::Point3d.new( *grid_pt )
end

def self.test_it
pt = Geom::Point3d.new( 3.976879.m, 3.760209.m, 1.002568.m )
tolerance = 0.25.m
grid_pt = self.round_point( pt, tolerance )

puts "Original: #{pt}"
puts "Tolerance: #{tolerance}"
puts "Grid Point: #{grid_pt}"
end

def self.adjust_vertices( tolerance = 0.25.m )
model = Sketchup.active_model
vertices = []
# Collect vertices.
for e in model.active_entities
vertices << e.vertices if e.is_a?( Sketchup::Edge )
end
vertices.flatten!
vertices.uniq!
vectors = []
entities = []
for vertex in vertices
pt = vertex.position
grid_pt = self.round_point( pt, tolerance )
vector = pt.vector_to( grid_pt )
next unless vector.valid?
entities << vertex
vectors << vector
end
# Apply transformations
model.active_entities.transform_by_vectors( entities, vectors )
end

end

I think this could be a very useful tool for cleaning many types of imported geometry.

Ross
0

rossthompson

### Re: Move points to a '3D grid'

thomthom wrote:Cubificator?

Polyhedronizer ?

Orthogonizer ?

Orthographizer ?

OrthograFixer ?

0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

In case TT is away...
Inside the code making the menu use
It affects the whole model.
This example uses 1cm grid
Use another 'tolerance' if desired...
If you use () it defaults to 0.25m anyway...
It's only some example code and could be better assembled into something working on a selection with warnings and an 'undo' ???
0
TIG

TIG
Global Moderator

### Re: Move points to a '3D grid'

Not sure this reduced poly rock is so good ?
Cuboidalizer.PNG
'Cuboidalizer' is another name idea too... that or 'Discombobulizer'
0
TIG

TIG
Global Moderator

### Re: Move points to a '3D grid'

Here's a beta version with an inputbox and undo operation...

It seemed to only change a cubes vertices in the Z axis ??
Code: Select all
module GridSnap

@@last_tolerance = 0.25.m

class << self # PROXY CLASS

def round_point( point, tolerance )
grid_pt = point.to_a.map { |n|
b = ( n / tolerance ).to_i * tolerance
r = n % tolerance
(r > tolerance / 2) ? b + tolerance : b
}
Geom::Point3d.new( *grid_pt )
end

def test_it
pt = Geom::Point3d.new( 3.976879.m, 3.760209.m, 1.002568.m )
tolerance = @@last_tolerance
grid_pt = round_point( pt, tolerance )

puts "Original: #{pt}"
puts "Tolerance: #{tolerance}"
puts "Grid Point: #{grid_pt}"
end

def adjust_vertices( tolerance = @@last_tolerance )
model = Sketchup.active_model
vertices = []
# Collect vertices.
for e in model.active_entities
vertices << e.vertices if e.is_a?( Sketchup::Edge )
end
vertices.flatten!
vertices.uniq!
vectors = []
entities = []
for vertex in vertices
pt = vertex.position
grid_pt = round_point( pt, tolerance )
vector = pt.vector_to( grid_pt )
next unless vector.valid?
entities << vertex
vectors << vector
end
# Apply transformations
model.active_entities.transform_by_vectors( entities, vectors )
end

prompt  = 'Tolerance'
default = @@last_tolerance

result = UI.inputbox([prompt],[@@last_tolerance],title) rescue @@last_tolerance
if result
begin
###
Sketchup.active_model.start_operation("#{title} (#{Sketchup.format_length(result[0])})")
#
#
###
Sketchup.active_model.commit_operation()
rescue
Sketchup.active_model.abort_operation()
else
@@last_tolerance = result[0]
end
end
end

end # PROXY CLASS

#{# RUN ONCE
#

end #}

end # module

0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

Dan Rathbun wrote:It seemed to only change a cubes vertices in the Z axis ??

Should apply to X,Y and Z... Seemed to work correctly in my quick test...
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author

### Re: Move points to a '3D grid'

Dan Rathbun wrote:
thomthom wrote:Cubificator?

Polyhedronizer ?

Orthogonizer ?

Orthographizer ?

OrthograFixer ?

It's like Autotune for cad! They can make you sound good, even if you can't sing.
If you are editing digital music, and you need to make the drum beats perfect, you can move the beats to the nearest sixteenth note, or whatever. It's call "quantizing".
0

daiku
PluginStore Author

### Re: Move points to a '3D grid'

daiku wrote:It's called "quantizing".

TRUE !!

Restriction to discrete values (or multiples thereof,) rather than any values in the set of possibles (real numbers, in this case.)

So.. the long term:
Vertex Positional Quantization

The short form:
Vertex to Grid
0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

Hi guys, I have had a play with Dan's Beta version and for me it works really well. The verticies are adjusted in X,Y and Z directions and the undo function works fine!

The only slight problem: it adjusts all the geometry in the model, rather than just the active selection. The original module just adjusted the active selection.

Any ideas?

Again thanks for the support - this script should be a realy time saver!

Ross
0

rossthompson

### Re: Move points to a '3D grid'

Well .. I did not think I changed the context of what Thomas' code did... just tried to wrap the code properly and added the menu_command() method to handle an inputbox.

I'll have a look at it.. again.

(And it's not really MY edition just because I added the inputbox.. it's still Thomas' thing.)
0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

OK... added support for a selection. (Pssst! ... there was no selection support from the beginning Ross.)

This utility should probably be wrapped in Thomas' toplevel author module, and reside below his author directory in some manner.

I'll leave those choices up to him, and when he releases version 1.0.0, we'll delete these beta versions in this thread and put in a link to the release thread.

Code: Select all
#  ==========================================================================
#  GridSnap.rb
#  --------------------------------------------------------------------------
#  by Thomas Thomassen
#
#  --------------------------------------------------------------------------
#  THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
#  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
#  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#  --------------------------------------------------------------------------
#
#  This utility quantizes the vertex locations, of the current selection,
#    of the model, or just the current context, to a 3D grid, whose interval
#    can be set via a popup inputbox.
#
#  --------------------------------------------------------------------------
#  Revisions:
#
#   0.1.0 : 2012-03-26 : by Thomas Thomassen
#   |
#   initial beta release
#
#   0.2.0 : 2012-03-26 : by Dan Rathbun
#   |
#
#   0.3.0 : 2012-03-28 : by Dan Rathbun
#   |
#   + Revised the menu_command() method to pass a selection set to the
#       adjust_vertices() method as a 2nd argument.
#
#  ==========================================================================

module GridSnap

@@last_tolerance = 0.25.m

class << self # PROXY CLASS

def round_point( point, tolerance )
grid_pt = point.to_a.map { |n|
b = ( n / tolerance ).to_i * tolerance
r = n % tolerance
(r > tolerance / 2) ? b + tolerance : b
}
Geom::Point3d.new( *grid_pt )
end

def test_it
pt = Geom::Point3d.new( 3.976879.m, 3.760209.m, 1.002568.m )
tolerance = @@last_tolerance
grid_pt = round_point( pt, tolerance )

puts "Original: #{pt}"
puts "Tolerance: #{tolerance}"
puts "Grid Point: #{grid_pt}"
end

def adjust_vertices( tolerance = @@last_tolerance, ents = nil )
model = Sketchup.active_model
vertices = []
# determine the context:
ents = model.active_entities() if ents.nil?
# Collect vertices.
for e in ents #model.active_entities
vertices << e.vertices if e.is_a?( Sketchup::Edge )
end
vertices.flatten!
vertices.uniq!
vectors = []
entities = []
for vertex in vertices
pt = vertex.position
grid_pt = round_point( pt, tolerance )
vector = pt.vector_to( grid_pt )
next unless vector.valid?
entities << vertex
vectors << vector
end
# Apply transformations
model.active_entities.transform_by_vectors( entities, vectors )
end

prompt  = 'Tolerance'
default = @@last_tolerance

result = UI.inputbox([prompt],[@@last_tolerance],title) rescue @@last_tolerance
if result
model = Sketchup.active_model
begin
###
model.start_operation("#{title} (#{Sketchup.format_length(result[0])})")
#
if model.selection.empty?
else
end
#
model.commit_operation()
###
rescue
model.abort_operation()
else
@@last_tolerance = result[0]
end
end
end

end # PROXY CLASS

#{# RUN ONCE
#

end #}

end # module

0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

Is there an easy way to have it go through the Outliner list and open each model group and snap those corners to the grid?
What would need changed in the script so that it would snap all visible geometry to the grid, Without having to manually select and open each group?
0

VertexMover

### Re: Move points to a '3D grid'

Dan Rathbun wrote:This utility should probably be wrapped in Thomas' toplevel author module, and reside below his author directory in some manner.

I'll leave those choices up to him, and when he releases version 1.0.0, we'll delete these beta versions in this thread and put in a link to the release thread.

It would need to iterate the model's definition list, changing those that have instances.

But I'm not sure if it is really safe to change entities collections outside the current context?

PM'ing TT
0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

Dan Rathbun wrote:But I'm not sure if it is really safe to change entities collections outside the current context?

That should be ok. One just need to keep in mind that the current open context apply a transformation that affect 3d points.
0

tt_su
SketchUp Team

### Re: Move points to a '3D grid'

Ok.. but are ya gonna repost under TT_GripSnap or whatever? (I had said we'd remove the code blocks above and replace with Store links when done.)
0
I'm not here much anymore. But a PM will fire email notifications.

Dan Rathbun
PluginStore Author

### Re: Move points to a '3D grid'

This wasn't something I ever planned to publish. It was just a code snipped posted for anyone to grab.
0
Thomas Thomassen — SketchUp Monkey & Coding addict

thomthom
PluginStore Author