README.txt

First, credit is due to:

Jos Stam http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/ns.pdf

Phillip Rideout http://prideout.net/blog/?p=58

GPU Gems 1

Thomas Diewald https://github.com/diwi/PixelFlow

Burton Radons https://github.com/Burton-Radons/

If you just want to mess with some fluids, open the parent viewer (shift-V) and left click to 'paint' with pink ink and force.

To change the setup of this scene like the resolution and dissipation settings, monkey with the parent parameters. You'll probably need to reset the feedback at that point.

If you want to introduce your own starting conditions or 'static' elements (stuff and force), change the inputs to the nulls labeled yellow. Anything can go in there but pay at- tention to pixel formats - you'll want to match what's there, and it's a clue to what those textures do in the computation.

For example - force is floating point in RG, where the red channel is X force and the green is Y force. As an eg., have a look at 'circl34', which is adding a quantity of vertical force to the simulation. It has 0 in its red channel and 0.2 in its green channel, which is the positive Y force that is creating the convection you see.

'Stuff', or ink, is also floating-point, and can have negative values, which means it can behave either additively (like light), or subtractively, like a mix of the behaviors of light and ink. It's not CMYK but can withdraw value from the RGB color channels.

As an eg, the 'circle1' op is adding the value '-0.7,-0.7,-0.7', thus pulling color out of the simulation. Pure white that makes it into that triangle will come out grey.

The 'starting' nulls allow you to set the initial conditions that will be present when you reset the simulation with the 'Resetfb' par in the custom parameters. I've added a banana in there as a sop to the banana fundamentalists among us. Not that kind of sop.

I've also exposed some of the 'constant' parameters used in the Navier-Stokes equations. Playing with them can break the simulation in fun and fantastic ways, but I think they're 'right' as they are.

Please let me know if you find some bunk math or bad practices. This was my first big GLSL project and I haven't touched it in more than a year, so, you know, YMMV, no express warranty, etc.

ENJOY!

Noah