Reading and drawing textures

Marc477

First, thank for all the fast answers.

@dan rathbun said:

The OpenGL draw functions are for use during custom Tools only, and they draw on the viewport, not in the model.

Sorry, maybe my explanation was confusing, but what I want to do IS drawing in the viewport via a tool. I don't want to change the model and I don't want to change the .skp file.

And how can I get texture's data loaded in SketchUp memory with an external tool ?
Do you mean that I should write every texture with the TextureWriter and then load them with an external tool ?

Thank you

Dan Rathbun

@marc477 said:

@dan rathbun said:

The OpenGL draw functions are for use during custom Tools only, and they draw on the viewport, not in the model.

Sorry, maybe my explanation was confusing, but what I want to do IS drawing in the viewport via a tool. I don't want to change the model and I don't want to change the .skp file.

The whole point of a Tool, is to allow the user to change the model. Otherwise the tool is pointless.

But perhaps you just wish to show some information on the viewport. Yes you can do this when your custom tool is active, but the viewport will be reset when the user actives any other tool (most likely.)

Dan Rathbun

@marc477 said:

And how can I get texture's data loaded in SketchUp memory with an external tool ?

I never said you could do this.

@marc477 said:

Do you mean that I should write every texture with the TextureWriter and then load them with an external tool ?

OK.. sorry the term "tool" is not correct (in the SketchUp sense of a "tool",) ... ImageMajik is an image manipulation utility program. I believe it comes as a command line executable, but may also be available as a dll.

You said you wanted to read a certain pixels value. An image utility "like" ImageMajik should be able to do this. The utility would temporarily load the texture file into it's own memory space.

You could also use platform dependent libraries. Windows GDI+ etc., and make calls to them via Win32API.

If your on Mac, then I do not know. One of the Mac guys can chime in.

tt_su

@marc477 said:

And how can I get texture's data loaded in SketchUp memory with an external tool ?
Do you mean that I should write every texture with the TextureWriter and then load them with an external tool ?

I'm confused - when you say "external tool" - you mean a custom Ruby Tool? Or some third party software?
And "load in memory" you mean for reading the bitmap data? ... I guess you want the bitmap data - since you talked about this earlier.
With SketchUp 2014 you now have the standard Ruby library and the gem system - you might be able to find some ruby gem you can install and use.

Dan Rathbun

Thomas he was responding to my use of "external tool", and I meant external utility library.

ImageMagick DOES have a gem, and is available for both PC and Mac.

Download the Ruby RMagick Gem: http://rubyforge.org/frs/?group_id=12%26amp;release_id=42049
(Use the MajikCore C API library.)

The ImageMagick site: http://www.imagemagick.org/
With 4 choices to use the libraries under Ruby: http://www.imagemagick.org/script/api.php#ruby

Here's the doc page on the view class.
http://studio.imagemagick.org/RMagick/doc/struct.html#view
(you can also use the Image.view instance method.
See: http://studio.imagemagick.org/RMagick/doc/image3.html#view

You need to install the ImageMagick libraries separately for the gem.
I have not gotten the gem to install to my system Ruby install... yet.
I get an errors.

Marc477

@tt_su said:

I'm confused - when you say "external tool" - you mean a custom Ruby Tool? Or some third party software?
And "load in memory" you mean for reading the bitmap data? ... I guess you want the bitmap data - since you talked about this earlier.

Yes sorry I meant "external third party library" and yes I want to read bitmap data.

Ok so there is absolutely no way to read bitmap data of loaded textures in Sketchup!?

Does that mean I need to double memory usage by reloading textures with an external library (probably OpenCv since I am working with a C extension).

Dan Rathbun

You can also use the ImageMagick libraries. (It is Open Source.) .. or maybe GIMP libraries ?

OR... FreeImage which SketchUp uses, and may already be loaded.
http://freeimage.sourceforge.net/

tt_su

@marc477 said:

Ok so there is absolutely no way to read bitmap data of loaded textures in Sketchup!?

Does that mean I need to double memory usage by reloading textures with an external library (probably OpenCv since I am working with a C extension).

Correct. I think we have a feature request to access the DIB data - but right now it's not possible.

Aerilius

The Ruby gem creates a wrapper around the almost complete ImageMagick API. For use with SketchUp, the major (and time&resource consuming) task is to export the texture image to a file in a temporary location, read it again and clean it up when not needed anymore. To improve performance, you would even need a caching mechanism.

All this is not provided by the Ruby gem.

For long image manipulations you would also want to run ImageMagick asynchronously, including the Ruby code that you run afterwards. Since I usually use only one or two ImageMagick commands (not the whole API) I once made a library that does the caching and asynchronous stuff.

Still, calling an external program is not ideal if you want to do a very interactive tool (see here). Then you would rather nudge Thomthom to include some more pixel reading/manipulation methods to the API. They could already be designing for the next version.

Dan Rathbun

@Andreas: I got an error, trying to compile the latest RMagick gem, under Windows, using the latest 32bit Ruby Devkit, for Ruby 2.0, against the latest 32bit ImageMagick (installed in "C:/ImageMagick".)

Were you able to compile such a so file ? If so can ya share it ?

Dan Rathbun

@tt: For a Ruby C extension, is it possible to get a handle on the FreeImage library that SketchUp has loaded ?

Or.. is it better to just re-load it when needed, and free it when done ?

nick9111

Hi, I am new to the community and also have a thing I don't understand how it should be done. For example, I can get filename of texture which is saved inside .skp file using

Sketchup.active_model.materials[0].texture.filename

Is there a way to rename it? (and keep reference of associated material to it)

Dan Rathbun

The texture is a property of the Material.

Save the material's size (if width and height differ,) so you can restore that.
Then re-assign the material's texture using:
matl.texture="new/path/to/renamed/imagefile"
Lastly restore the size needed.

TIG

I've answered this in your parallel thread http://sketchucation.com/forums/viewtopic.php?p=524826#p524826

Marc477

Thank you all, now I know how to do the first step (Reading texture data) but now I still wonder how to do the second step: drawing textures.

As discussed above it doesn't seem to be possible to draw them in the viewport so I tought I could create a new window and display an image in it. I found that there is a WebDialog class that could be useful to create the new window, but now does anyone know how I can draw an image in those dialogs? I would like to avoid reloading the texture from Hard Drive everytime I refresh the image (since the image will be edited).

I could load the texture only one time from the Hard Drive using ImageMajik (Thanks Dan), then update the "in memory" buffer directly and display it in the WebDialog. Is it possible to do that ? How do I draw in a web dialog an image loaded with ImageMajik ?

fredo6

Not sure I understand what you mean by reading textures, but you can at least extract them from Sketchup and show them as images in a web dialog.
TIG's method is the right one to go.

Here is a screenshot of my plugin ReportLabelArea

Report on Areas.png

Fredo

Dan Rathbun

@marc477 said:

I could load the texture only one time from the Hard Drive using ImageMajik (Thanks Dan), then update the "in memory" buffer directly and display it in the WebDialog. Is it possible to do that ? How do I draw in a web dialog an image loaded with ImageMajik ?

I do not think anyone has ever done it.

The HTML5 Canvas element will not work well on PC yet because SketchUp uses the MSIE WebBrowser control for WebDialogs. Microsoft is lagging behind in their IE support of the specification.

You CAN use the RMagick gem to draw, and save the edits to disk, and MSIE knows how to natively render image file formats, but you'll need to refresh the web dialog, to re-render the imagefile. (or have a html IMG element within a HTML file.)
See the doc: http://studio.imagemagick.org/RMagick/doc/
Also note there IS a RVG class that is based upon SVG.

Dan Rathbun

@dan rathbun said:

The HTML5 Canvas element will not work well on PC yet because SketchUp uses the MSIE WebBrowser control for WebDialogs. Microsoft is lagging behind in their IE support of the specification.

You can test by loading the HTML5 Bejeweled game into a WebDialog.

It most likely will not run under XP. But runs fine under Win7 with MSIE v11 installed.

Bejeweled.rb