I experience speed problems when working with many nodes. I used to do highly detailed/complex drawings in Illustrator and when I tried to do something similar in Inkscape or open up those original files it'd take a few minutes to open and then moving objects was like waiting for paint to dry! I've only recently been able to do detailed portraits like this http://www.hellocatfood.com/2009/10/06/family-portrait/ but that was by altering my workflow, which isn't really an idea solution.

Any work you can get done on this is much appreciated.

Ant

2010/1/4 Linda Walsh <inkscape@...2679...>:

I was wondering if anyone was planning on mods to speed up inkscape's interface and 3D ops?  I.e. where it "feels" like it could really benefit would be use of 3D hardware acceleration in doing some of it's on-screen rotations and movements.

Other areas with more 'niche' or smaller payoff would be using CUDA-based highly parallel processing (I hear that CUDA libs are good at scaling many points in parallel), followed by multiple CPU cores, and use of 64-bit instructions.

I think the most bang for the buck and most general would come from using 3D HW accel and moving to the extra memory provided by 64-bit.  I know that running out of memory is where Adobe Illus. quickly fails on larger vector drawings, especially in the undo/redo system.

It's amazing what Inkscape can do and how easy it is to do thing when it comes to vector stuff, but my version (.47) doesn't seem real stable after I've been running it for a while.  All of my long edit sessions in _playing_ with advanced features have ended by it crashing.

I wasn't trying to do anything in particular so I don't remember the workflow I did each time, but it was usually after it had been up a while.  Only once did I actually get to a point of saving an output w/o it crashing.  I'm a complete novice when it comes to computer art/SVG art, so I'd sure I was doing something that was 'unreasonable'... :-)

I didn't try to report the bug at the time as I'm sure the developers have their plate full with other problems and since I'm not real familiar with correct operation, I didn't want to be told that I wasn't using the product 'the right way' and by being a beginner, the crashes were due to me trying to do things that I should have done differently (though I tend to believe programs shouldn't crash in such situations, but there could be workarounds that would be known if I was more adept with the program).

I can try to report bugs if I'm not made to feel worthless for reporting them if I don't also include fixes for them...like I have got on some projects...(oh the joys of open source projects :-) ).

Linda

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Hello,

I have been lurking in this mailing list for a while and commented little, but the subject of performance peeked my interest. I've done some research into 2D hardware acceleration, both in implementing my own vector rasterizers using 3D hardware and shader programs, and through 3rd party 2D/3D apis (some of which use 3D hardware as well).

My conclusion is that 3D hardware can indeed greatly improve 2D rendering performance. I'd really like to see these great speed improvements pushed into a project like inkscape someday, but I am generally not an open source developer (I'm happily stuck in the world of Delphi programming).

My recommendations would be the following:

1. Look into the simple optimization of using shader programs to generate inkscapes polygon fills, especially when they involve any kind of gradients. I have written all the cross platform glsl shaders to handle any conceivable fill type including linear, radial, and cone with reflect, repeat, and clamp end options. I can donate that code as a starting point if anyone would like to take a look at it.

2. Get the cario guys interested in rolling hardware support into the cairo api. I've talked with them about a hardware openvg backend before. Maybe someone well respected from the inkscape can motivate them to get moving in that direction.

3. Take a look into openvg. I believe Trolltech has done some work on implementing that api in Qt. I used the Amanith openvg render and it works okay in opengl mode. That's another thing to look into.

4. And finally, someone might want to check out the evil Microsoft Direct2D api. I know it's locked into Windows, but it sure should take care of everything you'd ever need, and be blazing fast too boot.

I'll leave you with some screenshots of my glsl fill shaders in action:

http://imagebot.org/snapshops/colorful-radial-gradient-shader.jpg http://imagebot.org/snapshops/blend-gradients.jpg http://imagebot.org/snapshops/linear-gradient-reflect-brush-shader.jpg http://imagebot.org/snapshops/radial-gradient-reflect-brush-shader.jpg