David's Blog

Mostly Hobby Stuff

Archive for the ‘Videos’ Category

Shallow Water Simulator, OpenCL + Rigid Body Interaction

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Just a quick update to post a video of my current progress on my shallow water simulator.

Recently I converted the simulator to OpenCL(from plain C# code) and added rigid body to water and water to rigid body interaction. The conversion to run in parallel was very straightforward, for the rigid body interaction I subdivide the collision shapes into triangles when they first touch the waters bounding box, then just process each triangle separately using atomic operations to update the height and velocity fields. I need to investigate the performance in more detail and generally optimize things, but the initial conversion seems quite fast(the ducks scene runs at 45+fps when not recording video).

I have also added FFT wave simulation for small scale details and/or providing a nice water effect when interaction is not needed(although this is not shown in the video). You can find further details about this method at http://tessendorf.org/ .

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Written by therealdblack

March 6, 2011 at 5:51 pm

Higher Resolution Video

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I also have a better quality version of the water shader video on Vimeo, the reason I posted a YouTube version was that Vimeo took like 2 days to encode the video once I uploaded it…

Written by therealdblack

April 12, 2010 at 7:05 pm

Water Shader Video

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I figured out how to capture video and post to my blog, so I am posting a quick test video of my water shader. For anyone that is interested in the simulation of the water a great site to check out is: http://www.matthiasmueller.info/ (don’t be put off by the scary photo:-). What is shown here is the most basic shallow water simulation possible.

So here’s the water video:

Note: The artwork/settings are only preliminary, so things like the shadows, water colour, reflection image etc will look a lot better when I show proper artwork. Also ignore the misbehaving bit of cloth in the background, it is badly tuned and was put in the test scene a while ago to debug something.

Written by therealdblack

April 10, 2010 at 9:45 pm