Index
My PhD work at INRIA (France), at SYNTIM lab,
about the marvelous volumetric textures (or texels ).
You can find here images, mpeg animations, my PhD thesis, and my publications.
If you are far from Europe, here is a sample of the anims.
A small part of my non-official work at INRIA (mostly in french).
You can find here my short stories, my 'best bugs' gallery, etc.
good jokes sciences related or not.
I now work at iMAGIS, Grenoble, FRANCE. (new stuff there!)

## Clouds qualitative simulation

Beyond fluids local equations, that lead to costly 3D systems to solve, physicists characterize several structures at various scales in fluids, and their interactions, such as bubbles, jets, instabilities, waves, convective cells, vortices, etc.
The idea is to use directly this knowledge to generate convective phenomena, like cumulus clouds and billowing smoke are. This allowes to separate the scales: larges bubbles account for large range air motion, while waves and vortices lying on a bubble surfaces are just locally advected.
We indeed work on several scales:
ground air layer, heaten by the sun, producing bubbles (thermals) on hot spots.
bubble rising, up to the dew point where it becomes visible.
bubbles birth and movment inside the cloud, up to the border.
waves, degenerating into vortices, on the top of emerging bubbles, advected along the surface.
advecting subvortices on the vortices, etc.
advected texture figuring the smaller scales.

You wonder what is the relation with texels ? There is one. Both a texel and a bubble (primitive to be rendered in both case) introduce complexity in a scene by providing a `dressing' of large simple shapes...

## Results

Early results (see the EWAS'97 paper):

Large scale: cumulus cloud growing (by showing bubbles envelope)
Small scale: convecting bubbles (to be connected to the previous model).

Animated bubble (to be seen at high speed ! colors are for tests.)

## Bibliography

### Personal Publications

Clouds : EWAS'97 firsts steps for a multiscale model.

Clouds :