New Version 2 out. Click here

I made a very simple fluid simulation in Game Maker:

Link to video

Here's the source: http://anova.57o9.org/junk/fluid.gm81

The controls are: click to place a wall block, right click to release water, Shift to erase whatever is currently under the mouse, Delete to erase everything, and Enter to make a water pump that continually releases water.

The cellular automata rules are very simple:
1. If space to left empty: move left
2. If space to right empty: move right
3. If both left and right spaces are empty: randomly move either left or right
4. If space below empty: move down

Here's the code I used to simulate the water physics:
if position_empty(x,y+6)
{
y = y + 6;
exit
}
if position_empty(x+6,y) and position_empty(x-6,y)
{
randrange = irandom_range(1,2);
if randrange = 1 {x += 6};
if randrange = 2 {x -= 6};
exit
}
if position_empty(x+6,y)
{
x += 6
exit
}
if position_empty(x-6,y)
{
x -= 6
exit
}
I know I need to add a toolbar or a little box that shows the commands you can use in the next release. Besides this, any other suggestions or comments?

Here it is DJ http://ourl.ca/4279/169816 It's part of the physics lessons tutorials.  And nice implementation!  It seems you stumbled upon the same set of rules that I used! ^^

Here it is DJ http://ourl.ca/4279/169816 It's part of the physics lessons tutorials.  And nice implementation!  It seems you stumbled upon the same set of rules that I used! ^^

Yeah I actually used your cellular automata tutorials to make this ^_^

I could compile it into an exe for ya. i have the full 8.1 version.

Thanks! For some reason, GM 8.1 won't accept my license I paid for...

Isn't GM supposed to be free including for compiling? I saw many GM games being compiled using free versions before, the only difference being that no 3D was possible and there was a GM advertisement at the beginning when it was loading.

Btw this looks really nice.

Update: I guess I can help with it now. I added some new elements.

Changes:
Fazer added (allows particles to pass through for 1 second every 2 seconds)
Lava added
Bouncers added

I need help on the Lava+Water=Stone problem though, as "change object" and "create instance" don't seem to work.