I just today ran across Marek Raida's wonderful collection of examples:
http://svg.kvalitne.cz/index2.htm 

 

I had seen a few of these, and was impressed (like the yin and yang
animation) but had no idea how many things were there. You will want to see,
and to allow a goodly length of time to gawk.

 

Anyhow, I saw an example there of fire - animated continuously. It dates
back, apparently to the early Adobe SVG days (like 2001 or something).

 

It is an effect that I've been trying to create off and on for years now. 

A simplified demo is available at
http://cs.sru.edu/~ddailey/svg/feTurbulence11b.svg 

 

It is very counter-intuitive, but it works:

 

A rectangle (or other object) is nested inside three groups. The outermost
is filtered.

 

The two inner groups are both moved in opposite directions by
animateTransforms moving at exactly the same speed.  This keeps the
rectangle in place but tricks the filter pattern into following the
outermost animateTransform... 

 

How funny is that? My previous solution was to mirror-reflect a filtered
rectangle (h by w)  and to pull the new 2h x w rect through a pattern space,
as in the motion text effects at

http://cs.sru.edu/~ddailey/svg/GeometricAccessibility.html 

 

Anyhow, maybe lots of you already knew how to do this, but I'm very pleased
to have learned a new trick!

 

Cheers

David

 

 

 



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