Hi Roland Sorry haven't been in touch for while, been flat out with other print based rush jobs. I took your advice on the pre render, fire was just going to be too long to render, was going to take over 300hrs, so got another fire 30 seconds long and duplicated layer many times to stretch out over 15 minutes. It pre-renders great and in good time, but small problem when playing rendered file, every 30 seconds a black glitch appears, obviously where time line goes over where new layer below comes into play. It is as if a black frame has appeared at start of second layer underneath, but I have tried cutting frames off start and end of layer to no avail. I have found it in a few places in the actual after effects file when I move timeline over the layer transition. I have tried solid transitions and also fade out top layer and fade in layer underneath for a good transition but it still appears, any help with this would be great. Also I pre-rendered lights in the clip and they work perfectly. thanks Martin
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