Rune <run### [at] inamecom> wrote:

> Because the glow fire works on a black background only I've had to
> experiment with a media solution. This is the result so far. It's not
> perfect but it's a start.

> Media has both advantages and disadvantages compared to glows. Media works
> on all backgrounds but it is also slower. With media one have greater
> control over every aspect, but that also make it more difficult to control.
> Media is more precise (for example the turbulence is really 3D), but because
> of the complexity, errors are also more likely to occur. (There are a few
> annoying artefacts in the media in this animation and I don't know what
> causes it.)

Yeah, those artifacts are really strange.  You're using a blob, right?  Have
you tried looking at the shape of the blob in those frames?  Is it really
the media being clear, or is it the media being thin in those spots?  For
some reason (shape of the spots?), I think it might be the former, and if
so, that can be fixed.  If the latter, maybe different turbulence would
help.

> In this animation I tried placing the fire in a simple scene, and I think it
> works well. I also tried attaching a light_source to 20% of the particles
> (there are about 30 particles alive at a time), but I don't think it works
> particularly well. The fire doesn't flicker enough to the sides to make it
> worth while.

I thought the flickers were really nice, personally, especially on the back
stones.

I agree with others about the multiple sources.  That might also help the
flicker.  However, when doing multiple sources, overlapping might be a
problem (unless they're a single media object, which might not be too bad)
Also, the flames to the outside get drawn in towards the center somewhat,
which might be tricky to model, although an attraction force between the
particles may be sufficient.  In fact, that might be something you want to
do anyway, as the current flame is a little too broad at the top.  The point
effect is due to the hottest parts rising faster and the surrounding area
getting drawn in, after all.

Geoff

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