Hullo,

I'm creating volumes from image data, and from the looks of it i3dgen can't create volumes larger that 2gb. (size on disk)

Is this a known limitation?

9.1.218 xp64

Maybe >2gig volumes are a bad idea anyway - but ram is cheap these days and inquiring minds want to play..

Btw, is there a real benefit in splitting something up into several volumes, or does the tiled block format handle things efficiently enough anyway?

eetu.

I don't see why not. Do you have a simple test case? What resolution did you try?

First I made 256^3 and 512^3 volumes and they worked fine. When i tried to step up to a 1024 volume, i3dgen errored out after a while (“can't create attribute: density” or something like that). It left behind a 2gb .i3d

After that, i tried stepping down to 800, 720 and then 640 - always the same error and a 2gb file. Then 512 again worked fine and resulted in a working 1.9gb file. I'm writing r g and b as well as density.

My source data is rather large, but I'll whip up a procedural example hip.

eetu.

No need. I seem to be able to reproduce now.

UPDATE: I've tracked it down to bugs to Visual Studio 2005's C++ library when seeking, Linux works fine. I don't think it's going to be easy to workaround unfortunately. I'd recommend using Linux if you need files larger than 2 GB.

Thank you for the prompt investigation!
Much appreciated, not something that many other vendors would do.

Seems like it's just one more reason to switch to linux..

eetu.

I saw this in the journal.
Houdini 10.0.424: Fixed the MDD SOP so that it can handle reading .mdd files with sizes in the 2-4 GB range. However, it still does not handle file sizes greater than 4 GB.

Are these problems related? Could the fix be used for i3dgen.exe, too?

eetu.