United3dArtists Archive

froo · Post by **froo** » 17 Nov 2009, 00:01

Although the Physics.CollisionResponse() function does not work,
I did try a simple test, using the Physics.StartSimulation(), pause activity,
and Physics.StopSimulation().

Please note, this is Extremely rough. I did not put any effort into getting it
to look good at all. I just wanted to test the concept, to see if it would work.

It does.

So that's a good thing.

This is a simple short video of a cube with physics attributes applied.
The fluid interacts with the cube.

Finis · Post by **Finis** » 17 Nov 2009, 01:02

Someone should do a fire hose scene with this.

froo · Post by **froo** » 17 Nov 2009, 02:27

well, for some reason, the Physics Init takes longer and longer, as the frame number is incremented.
But, if I put the Physics.StartSimulation() inside a basic activity loop, I don't have that problem.
So that tells me I may need to rebuild the basic fluid sim node setup from scratch, for 7.61.
Just seems odd.

EDIT:

OR, it could be the fluid mesh is just very complex and it takes a long time to perform the collision tests,
since the cube is 'inside' the fluid mesh's 'sphere', so to speak.

Benji · Post by **Benji** » 18 Nov 2009, 03:30

This looks really cool, I hope you can work out the wrinkles without too much hassle.......

froo · Post by **froo** » 18 Nov 2009, 03:35

Muwahahahaha
Got it Cat Daddy!

This is a video.
Need to upload to youtube I guess; need to learn how.

This is another very simple test, but Yo! I Got Yer Fire Hydrant Right HEeerre!

froo · Post by **froo** » 18 Nov 2009, 03:41

Here is the scene if you want to take a look, at the script.
It needs work, and will ultimately need tweaking for each scene you do.

The script of interest is located in this node:

Scene Fluid Controller/Render Fluids/PhysStart

For some reason, if I add the object to the scene, then scale it, and start the fluid playback, the object
immediately starts moving. So that needs fixing. Anyway, at least this is a very good start.

As long as we don't try using the Physics.CollisionResponse() function we're ok.

froo · Post by **froo** » 18 Nov 2009, 03:56

just the zip containing the domain.bin file, and the fluid sim datasets.

froo · Post by **froo** » 18 Nov 2009, 19:18

hehe I solved the problem with the object moving automatically when scaling.
I was using: Physics.SceneCollision(). This meant, when I scaled the object, the object was penetrating
the ground. Hence, the object started moving.

I replaced the Physics.SceneCollision() with: Physics.PeerCollision(), supplying the two peers
as parameters to the function. Peer 1 is a cube, and Peer 2 is the fluid sim object. Sweet.

froo · Post by **froo** » 18 Nov 2009, 19:58

Here's the scene file, and a video showing the results of using the Physics.PeerCollision() function
instead of the Physics.SceneCollision() function.
Note that the cube stops moving, once collision with the fluid ends.

We can still have the cube continue moving, when using the PeerCollision() function, using some additional
scripting. I'll get to that later.

These simple demonstration videos are not aesthetically pleasing I know.
Bear in mind, the fluid you see here is NoTHING compared to what you can generate
with blender. I was not concerned with the appearance. Rather, I was interested in the
functionality. I just needed something there to work with.

I will get some much better fluids going tonight, with physics collisions.

froo · Post by **froo** » 18 Nov 2009, 20:35

another simple test.
In truespace, I rotated the fluid sim node 90 degrees about the y axis, to let it flow upward.
I did not need to rerun it in blender.

The idea here is, the cube is being pushed up by the water fountain.
I will get a finer looking movie this evening, demonstrating the idea.

froo · Post by **froo** » 19 Nov 2009, 20:54

This is a bit better.
Man I need to get a faster computer. hehe
Still, the fluid is too chunky. I can fix that.
I am still experimenting with physics settings.

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