Rendering animation

[cyseal]

When I make a flame and hit run script in Apo2.08 3d, it's rendering animation in preview

Code:

{ Rotate the reference triangle continuously }
{ Hit any key to stop }
Flame.SampleDensity := 1;
while not Stopped do
begin
  RotateReference(3.6);
  Preview;
end;            

How to render this animation as image sequence ?
For example what is the input for rendering image?
I could put render image after   RotateReference(3.6); and I could get image sequence.