A while back, I was interested in comparing the performance of Field3D with some other voxel storage libraries, most notably OpenVDB. Personally, I was interested in the memory- and performance implications of using different data structures, because when Field3D was first developed, our use of multiple data structures came from the assumption that different uses and applications require different data structures for optimal performance. Thus, it was of interest to us to see what each data structure’s performance was under a range of different tasks, so that we could make educated decisions about when to use each one.
The result of this is a suite of tests located at the GitHub/Field3D repo.
The test code was initially written by me, but as the various tests took shape, I implemented the Field3D parts, and people from the VDB team implemented the VDB parts.
Hopefully, the tests can be used as a basis for determining which data structure is more suitable for a range of different contexts: dense data, sparse data, narrow band levelsets, coherent lookups, incoherent lookups, memory overhead, etc., etc.
A summary of the test results is available in PDF form here:
Field3D performance tests
At SIGGRAPH 2013, we will be presenting some of the volumetric work that was done for Oz: The Great and Powerful. We will show an practical approximation of multiple scattering for path tracing, as well as various other developments that make GI volume rendering possible. Hope to see you there.
Click through for the abstract of the talk entitled Oz: The Great and Volumetric.
The source code for PVR is now available on GitHub. Head on over to http://pvrbook.github.com/pvr/ to clone or fork.
At the moment the build system only works for OS X, but Linux support should be coming in the next few weeks.
It’s taken a long time, but the book is finally in the last production stages: proof reading, typesetting and printing (!).
The release is planned for August, but there will be some previews and sneak peeks coming up before then: Next week I will be uploading the source code to GitHub for anyone who may be interested in an advance look (check out http://pvrbook.github.com/pvr/ for updates). And towards the end of July we will make one or two sample chapters available for download.
Last of all – a big shoutout and thanks to Vincent Serritella for designing the cover!
It was brought to my attention that the PDF file for Production Volume Rendering 1 had some bad fonts which cause Adobe Reader to hang when viewing certain pages. A version that fixes the issue has been uploaded to the course page.