Check the example 2 in the manual for material events: http://www.conitec.net/beta/amaterial_event.htm It's rather simple yet sometimes the choice of correct flags (_TREE,_RENDER,...) can be a little confusing, or there may be stuff you cannot change in render events.
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual
