As promised I received my Visual Studio 2008 on Friday from polyhedron and set about installing it on Saturday. This post will describe how to get VS 2008 to work with CUDA. I use CUDA 2.2 which is still under NDA so I wont be making any comments about its performance improvements today. Rather I will describe how to set up syntax highlighting, building and Intellisense.
Wednesday, 29 April 2009
Dynamic Holographic Displays
Every few days I have a look and see who has been visiting my site. There are lots of companies and Universities doing very interesting things and as they have found this site its likely they are interested in the same things I am, so its worth having a look at what they are busy with.
Today I found Zebra Imaging who have designed and built (alpha prototype) a dynamic holographic display. Although its difficult to see how it works on a 2D screen I'm imagining something like what R2D2 produced in Star Wars. Truly stuff of science fiction and will be interesting to see how well it works / what type of takeup it will get in the various fields they are targeting. Good luck guys! :)
Also worth a visit is the University of Rostock who are doing interesting things with liquid modeling and object<->liquid interactions.
On the subject of visitors, I get a lot of Universities having a look here but in particular a big "hello" to Stanford who seem to visit their bunny on a regular basis :)
Today I found Zebra Imaging who have designed and built (alpha prototype) a dynamic holographic display. Although its difficult to see how it works on a 2D screen I'm imagining something like what R2D2 produced in Star Wars. Truly stuff of science fiction and will be interesting to see how well it works / what type of takeup it will get in the various fields they are targeting. Good luck guys! :)
Also worth a visit is the University of Rostock who are doing interesting things with liquid modeling and object<->liquid interactions.
On the subject of visitors, I get a lot of Universities having a look here but in particular a big "hello" to Stanford who seem to visit their bunny on a regular basis :)
Tuesday, 28 April 2009
3D Gaussian - in sections
After installing VS2008 it took me a little while to get all my projects to compile nicely again. Quite a big jump from 2003->2008 :) and a lot of my paths were a bit out. I'll post later about getting CUDA 2.2 to work in VS2008 and the problems I had making it cross compile.
Just time this evening for a quick update: I finished my 3D Gaussian convolution on my generated data set - the attached image has clearly visible joins in it, these are to make sure my segmented approach of processing big data sets works correctly. The are easily removed by overlapping the non-boundary segments. The colours are based on my transfer function and don't reflect the underlying data accurately yet. It renders the volume at around 40fps.
Just time this evening for a quick update: I finished my 3D Gaussian convolution on my generated data set - the attached image has clearly visible joins in it, these are to make sure my segmented approach of processing big data sets works correctly. The are easily removed by overlapping the non-boundary segments. The colours are based on my transfer function and don't reflect the underlying data accurately yet. It renders the volume at around 40fps.
 |
| 3D Gaussian convolution (segmented) output |
OpenGL Bindless Graphics
When picking up my rss feeds this morning from Google Reader (which is really good) I came across a very exciting article from NVidia claiming a massive speed increase in OpenGL. The article is here.
In the past I mostly used PBO's but have been using more and more VBO's in the CFD visualizations so I will give these new extensions a try soon. Keep in mind it only applies to 185 and above drivers.
In the past I mostly used PBO's but have been using more and more VBO's in the CFD visualizations so I will give these new extensions a try soon. Keep in mind it only applies to 185 and above drivers.
Wednesday, 22 April 2009
CUDA Processing of Large Data Sets
As those who follow this blog will know, I have been playing with large generated volumetric data sets (around 16GB). The first operation I performed on them was a 3D Gaussian convolution in order to smooth a lot of the randomness out. My first implementation of the kernel was just the naive one - take a point and look at all the surrounding points. As I'm using a 5x5x5 kernel this means 125 memory reads per point - very poor!
Monday, 20 April 2009
Qt Creator or Visual Studio 2008
I have been using Visual Studio 2003 for a long time now - since it first came out in fact. It has performed it's job well. The random crashing of Studio 6 seemed to have been resolved and the autocomplete worked (75% of the time) Intellisense was still a bit of a nightmare but overall I lived with it quite happily.
Sunday, 19 April 2009
Volumetric Test Data
Here are two screenshots of my 512x512x512 generated volume. The one on the left is formed by generating random points in rough bands along the y axis with a higher noise factor towards the top - hopefully representing less dense material. Hidden inside the volume is a cube of much lower density than the surrounding regions.
The one in the centre is the same volume after the 3D Gaussian kernel was applied although it is at a slightly different angle. The right hand side screen capture is using a higher transparency function to show the little hidden cube.
[gallery]
I did run into a problem with the watchdog timer generating a timeout when running the kernel on the full 4kx4kx4k data set. Strangely switching the device to my non-display card didn't help at first. It turns out that Win XP had decided that my second 8800GT had a monitor attached to it, which seems to have activated the watchdog timer for the video driver. Something worth looking out for if you get watchdog timeouts on secondary cards.
The one in the centre is the same volume after the 3D Gaussian kernel was applied although it is at a slightly different angle. The right hand side screen capture is using a higher transparency function to show the little hidden cube.
[gallery]
I did run into a problem with the watchdog timer generating a timeout when running the kernel on the full 4kx4kx4k data set. Strangely switching the device to my non-display card didn't help at first. It turns out that Win XP had decided that my second 8800GT had a monitor attached to it, which seems to have activated the watchdog timer for the video driver. Something worth looking out for if you get watchdog timeouts on secondary cards.
Subscribe to:
Posts (Atom)