Hello,

I post a new liquid animation. It's again a ball falling in a tank of water.
The sphere is a little bit less dense then in the previous post.

On the simulation side, I added the handling of the rotation during the
simulation. I also changed the fluid -> object interaction : in the
previous simulations, only a force perpendicular to the surface was applied
on the object (proportional the the fluid pressure), resulting in no
rotation change in the case of a sphere. Now, I add a tangential force
proportional to the speed difference between the object and the water.

For the rendering, the object is no more an isosurface but a mesh. It makes
the object more regular than in the previous post. Moreover, I applied a
wood texture on it in order to visualize the sphere rotation.

Comments are welcome.

The video is MPEG1 encoded.

Regards,
Fidos.

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Attachments:
Download 'ball_wood.mpg' (611 KB)

>Comments are welcome.

I've been watching your progress with these animations and it is quite
amazing.  Great job.  

The one thing I see that looks odd in this one is that the fluid that
is carried over the top of the ball looks like it is not adhering to
the ball as much as it should.  It also seems to disappear into thin
air.


Kyle

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I also look forward to your very nice results.

you may want to check your code, as the rotation of the ball seems to
accelerate without apparent reason (towards the end of the animation) when
it's just floating. It could just be the fluid moving fast as a result of
the impact, but then the ball should not stay in the same place when
floating.

Can you tell a bit more about the simulation/render time and used hardware ?

Jaap.

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Hello Kyle,

What you noticed on top of the ball (the water seems floating in the air and
dispear) is due to a gap between the water isosurface and the ball mesh. It
is perhaps the mesh that is smaller than the isosurface that I use for the
simulation. An other reason may be an offset introduce during the rendering
between the two types of objects (mesh/isosurface).

Hello Jaap,

The acceleration may come from the movement of the water below the ball. The
coeficient that translate the tangential speed to a tangential force (and
then a torque for a sphere) is perhape to strong.

The simulation was around 12 hours and the rendering around 10 hours.

I use a P4 3.2 GHz with 1 Go of RAM. On software side, I use Windows XP and
MegaPov 1.0.


Thank you for your positive comments.

Regards,
Fidos.

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