Export images: how to?

Dan Rathbun

Hi,
Is there a way (like the texturewriter for materials) to export images that are used in a model as images (not as materials or textures) ?

Yea.. well the API says..

TextureWriter#load
http://code.google.com/apis/sketchup/docs/ourdoc/texturewriter.html#load
1st arg entity A face, image, component instance, group, or layer to load.

.. and TextureWriter#write
http://code.google.com/apis/sketchup/docs/ourdoc/texturewriter.html#write
1st arg entity A face, image, component instance, group, or layer to write.
You will need to generate sequential filenames and append them to a pathstring of your choice, probably from the index of the images array:

images=[]
Sketchup.active_model.definitions.each {|e|
  images.push(e) if e.class==(Sketchup;;Image) 
}
path='C;//some/path/to/folder'
ext='png' # or 'tiff' or 'jpg' etc.
tw=Sketchup;;TextureWriter.new
images.each_with_index {|img,i|
  tw.load(img)
  tw.write(img,File.join(path,"%s%04d.%s" % ['img',i,ext]))
}
tw=nil if tw.count==0

The above assumes the TextureWriter removes them from the tw object as they are written out. (I've never used this class so... test.)
[as always wrap in a method, inside a module, inside your toplevel module namespace]

EDIT: if you want your filenames to begin 'img0001.png' then change i to i+1 in the tw.write line.

thomthom

That assumes the source file for the Image is present at the computer the script is being run at.

You can iterate all the Image definitions as Dan demonstrated, but I'd then dig into the entities of the Image's definition (they are components after all) and find the Face. Then you can extract it with the TextureWriter and be 100% sure it'll work.

The material you obtain is not in the list in SketchUp's material browser, nor do you get it listed if you do a .each on model.materials. But you can get them all if you iterate by index, because model.material.count returns the number of normal material and image materials.

Here's a snipped from a WIP plugin that let the user set teh opacity of Images:


  # Context menu
  UI.add_context_menu_handler { |context_menu|
    model = Sketchup.active_model
    sel = model.selection
    
    if sel.single_object? && sel.first.is_a?(Sketchup;;Image)
      menu = context_menu.add_submenu('Opacity')
      (0..100).step(10) { |i|
        menu.add_item("#{i}%") { self.image_opacity(i) }
      }
      menu.add_separator
      menu.add_item('Custom') {
        
        result = UI.inputbox( ['Percent Opacity; '], [self.get_image_opacity], 'Set Image Opacity' )
        if result
          opacity = result[0]
          opacity = 0 if opacity < 0
          opacity = 100 if opacity > 100
          self.image_opacity(opacity)
        end
      }
    end
  }

  # Modifies the selected Image's transparancy
  def self.image_opacity(opacity = 0)
    image = Sketchup.active_model.selection.first
    definition = get_definition(image)
    face = definition.entities.select{|e|e.is_a?(Sketchup;;Face)}.first
    face.material.alpha = opacity / 100.0
  end
  
  def self.get_image_opacity
    image = Sketchup.active_model.selection.first
    definition = get_definition(image)
    face = definition.entities.select{|e|e.is_a?(Sketchup;;Face)}.first
    face.material.alpha * 100.0
  end

TIG

Here my simple script that extracts all of the model's images' image-files into a special folder [Extracted Images] in the model's folder, or if the model is unsaved in the user's home directory.
To use type extractimages in the Ruby Console...extractimages.rb

Didier Bur

Hi,
Thank you all for resolving my problem. With a mix of all ideas and code, I'll do it !

Didier Bur

Yessssssssss,

Here is my snippet to export images out of a model, assumed these images are NOT used as textures or materials, and if the original images are NOT present at their respective pathes on the disk:

def exportEmbeddedImages()
@model=Sketchup.active_model
@images={}
@model.definitions.each { |e| @images[e]=e.name if e.image? }
#@tw=Sketchup;;TextureWriter.new seems buggy because when write_all is called,
# got the error "<wrong argument type (expected Sketchup;;TextureWriter)>"
@tw= Sketchup.create_texture_writer 

	@images.each_key do |idef|
		# find the corresponding face in each definition of image
		idef.entities.each { |e| @f=e if e.typename=="Face"}
		#retrieve texture of face and load it in texturewriter
		if @f
			#puts @f,@f.material.texture.filename
			@tw.load(@f,true)
		end
	end
# set the path as needed
@tw.write_all("c;\\images",false)
end

Thank you all for your help !

thomthom

@unknownuser said:


> #@tw=Sketchup;;TextureWriter.new seems buggy because when write_all is called,
> # got the error "<wrong argument type (expected Sketchup;;TextureWriter)>"
> @tw= Sketchup.create_texture_writer
>

Sketchup::TextureWriter.new is not even documented. All examples from Google use Sketchup.create_texture_writer

Sidenote:
if e.typename=="Face"
That is slow -because it compares strings.

if e.is_a?(Sketchup::Face)
This is much faster.

Dan Rathbun

@thomthom said:

@didier bur said:

@tw=Sketchup::TextureWriter.new seems buggy because when @tw.write_all is called, got the error
<wrong argument type (expected Sketchup::TextureWriter)>
Sketchup::TextureWriter.new is not even documented. All examples from Google use Sketchup.create_texture_writer

Sorry.. noticed that (it was late, too tired to go looking for the constructor.)
After fiddling around I think that .new is undefined, and calling it just calls Class.new, and certain things in the instance do not get initialized.

Dan Rathbun

@didier bur said:

Here is my snippet to export images out of a model ...

a couple of questions:

(1) why? @images={} and not @images=[]
(why use a Hash when an Array should do?)
You'd also need to change @images.each_key to @images.each

(2) when you use tw.write_all,

how does Sketchup name the files for those images that had no name?* what format does Sketchup write the images in?
(the original format or all TIIF?)

TIG

@dan rathbun said:

@didier bur said:

Here is my snippet to export images out of a model ...

a couple of questions:
(1) why? @images={} and not @images=[]
(why use a Hash when an Array should do?)
You'd also need to change @images.each_key to @images.each
(2) when you use tw.write_all,

how does Sketchup name the files for those images that had no name?* what format does Sketchup write the images in?
(the original format or all TIIF?)

I agree that an array [] and .each would be the best solution.

The texturewriter names the images from their textures' image-path-name - even if it no longer exists as a file - ALL textures will have an image-path. The tw also adjusts the exported file's name, making spaces into underscores and removing all other punctuation - e.f. C:\images\my+image 123-4.jpg becomes myimage_1234.jpg: should this result in two exported images with the same name the later ones have a numerical suffix added so ../my+image 123-4.jpg and ../my-image 123-4.jpg would export as myimage_1234.jpg and myimage_12341.jpg etc. The exported images take the format of the original, deduced from the name's suffix - jpg/png/tif etc.......

thomthom

@tig said:

I agree that an array [] and .each would be the best solution.

I assumed it was part of a larger piece of code since it used instance variables.

Dan Rathbun

@didier bur said:

@Dan: - I didn't even know that an image could have no name...

Well TIG says it always has an image.path
.. I was going by what you said in the 1st post. You said your image.path=nil ??

@TIG: Great answers! I asked because the API is vague. Your info should go into the API TextureWriter.write_all description, most definately.

Didier Bur

@thomthom: correct, I need the names for another purpose, along with the associated definition. (su2pov)

@Dan: - I didn't even know that an image could have no name... How can this occur (each image has a path (with a file name at the end) image.path=nil occured only one time with an old model and I cannot reproduce this, so I think I made an error whan typing code in the console or something like that...
- tw exports at the original format.