Xenic.... I generated a rock and applied a mat....Duplicated it and made it a little bigger than the first rock. I applied Clays Fire Material to the larger(2nd) one. Then I used a booleaned cone for the fire trail and once again applied Clays Fire Material to it. For the smoke I made some spheres and applied the default burning tire smoke mat that installs with Bryce. Like I said that was a quickie and not very good... much better results, more realistic, can be had by taking a little more time than I did. Hope that made sense. Hope it helps. You have a nice scene going by the way. The cracked glass is a pretty neat effect.

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