Spring RTS Engine

in your unitDef add this:
pieceTrailCEGTag = "fire",

Now whenever you Explode a piece, it will use the ceg named fire0

You can also do this in your unitDef:
pieceTrailCEGTag = "fire",
pieceTrailCEGRange = 4,

Now whenever you Explode a piece, it will randomly try to use the ceg named
fire0
fire1
fire2
fire3

Btw I think this system is stupid because now you can not ie use your ceg "smoke" because you have to rename it to "smoke0"

It would be better if this was possible:
pieceTrailCEGTag =
{
[1] = "fire",
[2] = "smoke",
[3] = "sparkle",
}

kill/selfd the "hovereffects" unit in http://code.google.com/p/springtutorialgame to see

Xta has good examples.